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Magnetic resonance imaging scan



MRI scan – NHS Choices






























































MRI scan 

Introduction 

Health checks: later years

Once you reach the age of 65, you’ll be offered a range of NHS health checks including some specifically for older people

Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body.

An MRI scanner is a large tube that contains powerful magnets. You lie inside the tube during the scan.

An MRI scan can be used to examine almost any part of the body, including the:

  • brain and spinal cord
  • bones and joints
  • breasts
  • heart and blood vessels
  • internal organs, such as the liver, womb or prostate gland 

The results of an MRI scan can be used to help diagnose conditions, plan treatments and assess how effective previous treatment has been.

Read more about how MRI scans work.

What happens during an MRI scan?

During an MRI scan, you lie on a flat bed that is moved into the scanner. Depending on the part of your body being scanned, you will be moved into the scanner either head first or feet first.

The MRI scanner is operated by a radiographer, who is trained in carrying out X-rays and similar procedures. They control the scanner using a computer, which is in a different room to keep it away from the magnetic field generated by the scanner. 

You will be able to talk to the radiographer through an intercom and they will be able to see you on a television monitor throughout the scan.

At certain times during the scan, the scanner will make loud tapping noises. This is the electric current in the scanner coils being turned on and off. You will be given earplugs or headphones to wear.

It is very important that you keep as still as possible during your MRI scan. The scan will last between 15 and 90 minutes, depending on the size of the area being scanned and how many images are taken.

Read more about how an MRI scan is performed.

Safety

An MRI scan is a painless and safe procedure. You may find it uncomfortable if you have claustrophobia (fear of enclosed spaces), but most people find this manageable with support from the radiographer. Sometimes going into the scanner feet first may be easier, although this is not always possible.

MRI scans do not involve exposing the body to X-ray radiation. This means people who may be particularly vulnerable to the effects of radiation, such as pregnant women and babies, can use them if necessary.

However, not everyone can have an MRI scan. For example, they are not always possible for people who have certain types of implants fitted, such as a pacemaker (a battery-operated device that helps control an irregular heartbeat).

Extensive research has been carried out into whether the magnetic fields and radio waves used during MRI scans could pose a risk to the human body. No evidence has been found to suggest that there is a risk, which means that MRI is one of the safest medical procedures currently available.

Read more about who can and can’t have an MRI scan.

Page last reviewed: 05/09/2013

Next review due: 05/09/2015

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Comments

The 27 comments posted are personal views. Any information they give has not been checked and may not be accurate.

butterfly04 said on 24 September 2014

I wanted to reply to Cupcake on the previous post. What a terrible ordeal for you and for the staff not to reassure you is not acceptable. To make sure you can have your MRI done, you should contact your GP or consultant and ask them to put in a request for Individual Funding so that you can have the scan on an ‘open’ or ‘upright’ MRI machine (these are suitable for people with claustrophobia). Good luck and I hope your next experience is better than this one.

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cupcakequeen1 said on 15 September 2014

I have just returned home from my appointment today which was to have an MRI scan on my back. The scanning unit is in the car park just now, which I understand has cut the time of waiting for an appt down and I am all for. I had read up on the hospital website before this appt as I suffer from panic attacks in small confined spaces. It advises, you may be able to go in feet first if you are suffering with claustephobia, also you can have someone in with you, so I took my husband. Also you can take a music disc, this I did, all the things to help me get through it. Firstly, my husband was not allowed in as there is no waiting area for him, nobody asked did I have a disc to play, with the radiographers back to me he answered my question of am I ok to have this scan with a coil fitted, replying was it done in the EU ? then off we went into the scanning section, earplugs given and headphones in place of we go, with two inches approx to spare and the words are you ok, had the worst panic attack ever, came out of the machine for the radiographer to say are you ok we are not hear to tortchure you, that was the end of my scan, yeah my choice it never took place,. and I left with a mumble of we will let your GP know you could not go through with the scan, and that’s the way out. No alternative, no shalI get your husband, or anything just goodbye, I was in bits leaving that van. where’s the compassion and help and guidance gone. Yeah its my own fault, yeah I suffer with panic attacks, is there no help for this.

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User117967 said on 23 August 2014

Hi. Got an head MRI soon for Trigeminal Neuralgia & I am very worried about it. My main worry (silly i know) is that i have drawn on eyebrows with eyebrow pencil as i have overplucked my eyebrows to almost nothing. I am never seen without. Will I be made to remove them?????

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practive said on 13 August 2014

I had an MRI scan last Thursday (6 days ago). Since then, every time I get out of bed, bend down, stand up etc, I feel dizzy. I looked on the internet and found an article in the Daily Mail (23 Sept 2011) – the headline goes “MRI scans can make you dizzy: magnetic fields disrupt fluid in inner ear”.

It explains “MRI vertigo is caused by interplay between the magnetic field and the salty fluid that fills labyrinth canals, the scientists believe. The magnetic field is thought to push on the current of electrically charged particles circulating within the tubes. This in turn exerts a force on the cells which use the fluid’s flow to detect motion.”

I wasn’t warned about this possibility before the scan and I just don’t know how long the effects will last I wonder if others have been affected by this.

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PeerAdder said on 07 August 2014

Just had a scan to help diagnose nerve damage following a prolapsed disc. The scan itself was straightforward and easy – nothing to worry about. Some music would have been nice but I wasn’t in there for very long (about 20 minutes) and would probably have fallen asleep if it had been any longer.

One tip – get yourself comfortable quickly as (in my case at least) there wasn’t much time before the scan started. What I did notice was a slight tingling sensation in my chest and some tension in my arms when the scan was active. Not uncomfortable, but definitely there. For the record, to the best of my knowledge, apart from my fillings, my body is metal free! In any case, my head wasn’t being scanned.

Take a look at this article:

https://www.biac.duke.edu/research/safety/tutorial.asp#SF_3

which covers the whole process, and even includes a section on nerve stimulation which I’ve not seen anywhere else and which might possibly be the source of the tingling.

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Dutchie72 said on 08 May 2014

It’s been really useful reading some of these comments. I have chronic neck and back pain since falling off my bike, whilst triathlon training, nearly 4 years ago. I believe my chiropractor made my neck worse, a day after my last visit to him (6 weeks after falling off my bike), he said he was worried that I was getting any better. He asked me to come back the following week to get a second opinion from his colleague. I didn’t return as the next day, I woke up at 2 am, not being able to move my head due to excruciating pain. To cut a (very) long story short, after a short stay in hospital, being in continuous pain for months, finally having an X-ray 7ish months later, I was told I had a ‘loss of cervical lordosis’. Three years later, after many NHS physio appointments and cortisone injections, many visits to the doctors in tears, I am still in chronic pain. I have, this week, been told that I cannot have an MRI scan and that I will probably need more injections. This is rubbish! I am in constant pain, not just in my neck but by back too now. The first set of i jettisons worked for 7 weeks, the second didn’t. The ‘loss of cervical lordosis’, I could’ve always had. Reading some of these posts, I am a bit reluctant now to keep asking for an MRI scan, but at the same time, I want to know what’s going on. I am tired. I am not being listened to. I am seeing a physio tomorrow (privately) as I feel the NHS is letting me down. I am seeing NHS pain management again in July. Should I keep requesting for an MRI scan even though some of you had bad, long term symptoms? Thank you for taking the time to read this. Those of you, suffering from chronic pain, I understand. It is draining, tiring … something we shouldn’t have to put up with this day and age x

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Catgirlshirl said on 05 May 2014

Had a MRI today lasted 15 mins . Was very loud noises but I had a very nice lady radiographer talked me through it with intercom . It is very claustrophobic I never opened my eyes till I came out . Don’t worry about having a MRI just think it will find out what is wrong .

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Informed patient said on 20 April 2014

I had a lumbar MRI scan (non contrast) at The Circle Hospital in Bath on March 27th. Like "Babbity Blue" below I may have had an adverse reaction to the scan from which I am still suffering three weeks later. 48 hours after the scan I felt muscle pain all over my body.
This became worse and I suffered stiffness and swelling in my right leg and arm. A multitude of tests have been carried out and infections, a heart condition, a neurological condition and other suspected causes (e.g. flu) have been eliminated.

Everyone says that there is no known side effects to non-contrast MRI scans (e.g. where no blood dye is used), but I am not so sure.

I am still only semi-mobile and the doctors declare themselves baffled.

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fluffyfred said on 10 April 2014

Had MRI scan yesterday due to continued pain attacks after gallbladder removal. I was surprised that it takes years for some people to get a scan, but I had mine two months after my op. I’ll be surprised if it shows anything abnormal. It’s not I have no confidence in the scan, it’s just that I have a feeling that they’re going to say they can’t find what’s causing the pain attacks.
As for the scan itself, it is painless, unless you have scars. Where my gallbladder was removed, I had pain during the bit where I had to hold my breath. The pain hasn’t subsided (it’s not agony, just more uncomfortable).
I am claustrophobic, but apart from a little panic when I was being put into the scanner, where I felt like the room was spinning, everything else was fine. I was told I could take my own choice of music on CD, so I took one of my CDs where I knew the words to the songs, and during the noisiest part of the scan where I couldn’t hear the music, I could still sing along in my head which helped a lot. I was also provided with a blindfold as I was worried I’d open my eyes during the scan and panic.
I’ve had a couple of friends who found the radiographers to be abrupt when they were starting to panic, but the one who did mine was lovely and regularly checked I was still ok.
The other thing which helped a little as well, when I was sat in the waiting room, I could hear beeps and noises which were oddly calming. The radiographer confirmed that was the scanner, so although I was still nervous, it would have been worse had I not hear those noises. Obviously the experiences are different for people, but mine was good.

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shannan123 said on 07 April 2014

In response to Babbity blue’s post, I am a neuroscience PhD from the University of Sydney. In March 2013 I was running some research at the MRI facility our lab uses for my studies at NeuRA in Randwick, Sydney. I went into the scanner, having given the radiographer details of what was required for myself as a ‘control’ in that particular brain study (being run by one of my colleagues at Sydney Uni). Following approx one and a half hours of brain scanning I got out and left. However within a couple of hours that afternoon I developed a headache which, four days later had gradually increased to full-blown meningial inflammation. I was severely ill and in a huge amount of pain for 8 months with all the symptoms typical of meningitis.Under the care of my GP and was hospitalised 3 times. My neurologist has no idea how I developed meningitis (I also went down with pneumonia while I was so sick). Although my inflammatory markers were extremely high, no bacteria or virus was detected in numerous blood tests.

I remain in a lot of pain now, 13 months later. I’m unable to bear any vibration (can’t go in cars etc), no bright lights, no loud sound and no complex input (ie no TV, no radio, no electronic devices near my head such as phones). For months I was unable to even walk because of the vibration from my heels hitting the ground sending pain to my head. I am also unable to bead any sunlight on my head whatsoever. I must remain indoors and can only walk very short distances under a UV umbrella before the pain goes up – interestingly I’m able to bear hot water on my head (eg for washing my hair) so it’s not simply a matter of heat on my head.

It may be coincidental that I developed this inflammatory disorder immediately following the scan but I’d had lesser headaches following putting myself into the scanner on the 2 occasions previous to this extreme one. I hope you’re feeling better. If anyone else has experienced side-effects similar to these, please contact me.

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shannan123 said on 07 April 2014

I’m interested in Babbitty blue’s post. I am a neuroscience PhD from Sydney, Australia. In March 2013 I was running some research at the MRI facility I use for my studies. I put myself into the scanner, having given the radiographer the settings I required for myself as a ‘control’ in the brain study I’m running. Following one and a half hours of brain scanning I got out and left. However that afternoon I developed a headache which, four days later was full-blown meningial inflammation. I was severely ill and in a huge amount of pain for 8 months with all the symptoms typical of meningitis. My neurologist has no idea how I developed meningitis (I also went down with pneumonia while I was so sick). I remain in a lot of pain now, 13 months later. It may be coincidental that I have this inflammatory disorder immediately following the scan but I’d had lesser headaches following putting myself into the scanner on the 2 occasions previous to this extreme one. I just wonder how many people have inflammatory reactions to the massive magnetic field, leading to pains in the body or brain following MRI. My opinions and thoughts have been disregarded by the medical fraternity, in spite of me being a qualified neuroscientist myself, which leads me to wonder how many ‘ordinary’ members of the public might be being ignored if they experience inflammatory pain following MRI. I would be very interested to hear from anyone who’s had such reactions. I hope that you feel better soon and please persist in telling your GP or specialist how you feel. We, as medical professionals, can only make changes if we have feedback from patients and only then if we act on it appropriately. In my opinion this is not being done for MRI and it may in fact not be as safe for some people as it’s being made out to be.

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Babbitty blue said on 15 February 2014

I had an MRI scan a couple of weeks ago and since have suffered badly with pains throughout my body, my mobility is now very limited, I can barely walk and it is agony putting my body weight on my legs. I have been told the MRI scan has caused inflammation of my nervous system. Has anyone suffered with these side effects, are they permanent? I am really very anxious as the pain is so severe. The scan was a spinal scan and took one hour fifteen minutes. I am now almost virtually housebound.

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Gongon said on 31 January 2014

Had MRI scan last night as part of diagnosis of my prostate. Heard a few scare stories about claustraphobia and noise so was a little concerned.
As it happened, didn’t need to be.
Got changed into a gown, climbed onto table and was loaded into the machine!
Had some headphones put on with a little music but a bit too quiet as it happened.
Was given a panic button before I went in, then the machine started up with all sorts of strange noises (pops, bangs, buzzes.
Procedure took 35 minutes, at the end of which I was almost falling asleep!
Totally pain free and certainly nothing to be concerned about.
Have a biopsy next Tuesday then the diagnosis about 2 weeks away

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Richard Ormnd said on 02 January 2014

I had an MRIScan of my lower bowel today.i have had one before but being claustrophobic I was very apprehensive. As it turned out the worst bit was drinking what felt like a gallon of water with orange and having a cannula inserted. The scan took some time but was divided into short scans during which I had to hold my breath. I kept my eyes shut throughout and found that counting helped to distract me and also helped me to hold my breath. Although I was offered music and accepted I didn’t hear any.
I accidentally opened my eyes once and was relieved to see lighting and that the roof of the tunnel wasn’t as near to my face as I had imagined.
My advice is that the stress of the anticipation far outweighs the actual experience.lay back and relax,the time goes quite quickly.

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lots1 said on 09 November 2013

I had a MRI scan yesterday and was very, very nervous particularly having suffered from anxiety disorder. I hope this may help anyone worried about the procedure 🙂

I had my head scanned, so this was in the middle of the tube. From my waist down was still outside the tube.

You are laid down and as you go in your head slides into a "cage". This was much less scary than I anticipated as it is quite close and therefore your eyes can’t really focus on it properly, instead I focused on the mirror above which showed the outside and my feet.

There is a breeze flowing through the tube, which really helped reduce claustrophobia and you are given a button to squeeze if you need to speak to the staff, who were lovely.

Although I was given headphones the machine was very loud, but in no way unbearable and the staff kept talking to me between scans, to check I was OK. It can also vibrate a little, but not much. In total I was inside for about 20 minutes. The noises can help relieve the boredom actually!

There was the odd moment where I felt a little anxious, but these were fleeting and concentrating on my feet outside was enough to keep me calm. I was also pleased that as I wore no metal I did not have to change into a hospital gown (I wore jogging bottoms and jumper).

Good luck to anyone having a MRI, I hope this helps anyone worrying like I was.

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whoisthatchild said on 18 October 2013

I had my first ever MRI today for back problems. Trippy or what? As well as the warm tingly feeling I noticed a very small amount of pain in some scar tissue in my eyelid. It wasn’t really anything, but I chatted with the nurse about it afterwards and she confirmed I wasn’t imagining this. I should point out that I have a few scars, a lot bigger than this one, and none of the others felt anything. It must be something to do with the sensitivity or something of the eyelid. I also felt slight pains in various places in my back during the procedure, again nothing to write home about, but I noticed them nonetheless. The back pains could have been due to my back problem, but I felt them in places where my back doesn’t normally hurt, as well as my normal pain areas, so I am leaning towards putting this down to the MRI as well. I also felt a little "high", for want of a better description, and again I am putting this down to the effects of the scan. All in all very strange. Also strange is the fact that I am suffering a bit less than normal after the scan, again could well be due to the MRI.
Spoke to my dad who has had MRI previously and he says he felt nothing.
I must stress that in no way would this put me off having another scan. These pains were hardly pains at all, more like "feelings". Not even enough to make me flinch (you are not allowed to move in the scanner), so that was lucky.
It is very confined though and I closed my eyes all the way through and listened to the radio through the headphones. The worst part was by far the feeling of claustrophobia, but if that would put you off (and I do get claustrophobic) then maybe you don’t need the MRI. I would happily do it again if it were deemed necessary to help fix my back problem.

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Kirben said on 28 September 2013

I had an MRI scan on my pelvis yesterday and having read many people’s stories, I was very nervous. I had to have the contrast dye put in through my arm and it wasn’t painful and I couldn’t really feel it going into my vein. The radiographer explained everything and put my mind at ease and they provided music in the head phones which I suggest you ask for. Focusing on music helps you to relax and cuts out some of the noise. And yes it is noisy but not unbearable. You actually begin to realise when a new scan is starting and finishing by the noise the machine makes. The noise is bearable and actually the whole thing lasted only 25 minutes. So don’t panic, try and relax and ignore all the horror stories because it’s an ok procedure.

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User804970 said on 19 September 2013

Im 20 and have been experiencing chronic back pains since i was 15 🙁 im 21 this year and feel like im 50. I cant remember the last time i have woke up pain frwe. Its really getting to me now. I have been tested for numerous things and tested negative. I got to the doctors and come out with now answers every time, physio has been done and xrays etc. I broke my hand and thumb in my sleep one night and didnt even realise. Doctors thought my partner had been beating me and werent curious about it one bit considering i had done it in my sleep. Im just getting fed ofnot knowing what is the matter with me and wont even consider giving me an mri or more tests. Im getting very bitter about it as a girl can get a boob job over nhs because she isnt happy with a b cup but then there is people in the same situation as me and they still dont do anything about it 🙁 someone help me please

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Sprout01 said on 11 September 2013

I have suffered with a painful back, hips and knees for about 4years now. I’ve had x-rays, blood tests, physio, seen a rheumatologist and orthotics departments. Now, after all of that and having been on kapake and tramadol 3x a day, I’ve actually been referred for an MRI scan at last! The only thing I can suggest in getting a scan is, keep pestering the doctors. Good luck to everyone waiting for a scan or results.

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warriorsq said on 07 September 2013

York Tyler – There is a procedure to getting an MRI unless it’d deemed very serious

1st: doctor- should give painkillers and muscle relaxants for 4-6 weeks if that doesn’t work he/she is obliged to refer you to hospital (if they don’t after this period remind them it’s your legal NHS right!)

2: physio – the usual place you will be sent by your doctor at hospital is physio, they will asses you and usually give exercises to preform for about a month if after that you have no improvement they then should refer you to an MRI.

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York Tyler said on 25 August 2013

If only my partner could get an MRI scan! He’s in severe back pain and so bad we’ve seen an out of hours doctor at our local hospital. When it was suggested we were told they were reluctant to do it because of the costs. It makes me very angry to think that I have paid my dues for many years and then get treated in this way.

Has anyone else been refused. Prolonged pain is a sign that nerves could be damaged and this can be permanent and can mean loss of sensation or even partial paralysis. Isn’t that serious enough?

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osabanti said on 14 August 2013

My wife suffers from multiple health issue, i was told she can not fit the MRI scan because she is 24stone. i am so worried, is there any other way for her?

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dianexx said on 25 April 2013

hi, i had a mri scan on my right knee yesterday, i was a bit nervous bout haveing it done, theres nothing to worry about i was only in there for 20 mins theres abit of noise, take an cd with you to listen to.

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susieh13 said on 03 August 2012

Just got home from having an MRI at the John Radcliffe Hospital in Oxford, and have to say, as a claustrophobia sufferer, it was not as bad as I feared. I did keep my eyes closed the whole time, as, although there was a picture to look at, I could not see it properly without my glasses, so waste of time. The noises were a bit off-putting at the beginning but I started counting to myself, but soon gave up as I kept getting lost anyway. I had taken a Diazapam before I went, so I suppose that did help. All in all, not too bad, and I would not be so scared next time.

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milly j said on 15 May 2012

got my mri scan 2moz scanning my lower back bit nervous but readin these reports made me feel a bit more relaxed

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CathieG said on 04 June 2011

This is a quick down to earth explanation. For further information there are tabs near the top of the page for more in-depth facts for those who need them.

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rrsheard said on 15 February 2011

Far too short and lacking in information. Maybe should have links to more info

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CT scan

A CT scan uses a series of X-rays to produce very detailed pictures of the inside of your body










NHS Choices Syndication


 /conditions/articles/mri-scan/how-is-it-performed

Magnetic resonance imaging scan

How an MRI scan is performed

A magnetic resonance imaging (MRI) scan is a painless procedure that lasts between 15 and 90 minutes, depending on the size of the area being scanned and the number of images being taken.

Before the scan

On the day of your MRI scan you should be able to eat, drink and take any medication as usual, unless advised otherwise.

In some cases, you may be asked not to eat or drink anything for up to four hours before the scan, and sometimes you may be asked to drink a fairly large amount of water beforehand. This will depend on the area being scanned.

When you arrive at the hospital you will usually be asked to fill out a questionnaire about your health and medical history. This will help the medical staff performing the scan be as sure as possible that you can have the scan safely. Read more about who can and can’t have an MRI scan

Once you have completed the questionnaire, you will then usually be asked to give your signed consent for the scan to go ahead.

As the MRI scanner produces strong magnetic fields, it’s important to remove any metal objects from your body, including:

  • watches
  • jewellery, such as earrings and necklaces
  • piercings, such as ear, nipple and nose rings
  • dentures (false teeth)
  • hearing aids
  • wigs (some wigs contain traces of metal)

Any valuables can usually be stored in a secure locker.

Depending on which part of your body is being scanned, you may need to wear a hospital gown during the procedure. If you do not need to wear a gown, you should wear clothes without metal zips, fasteners, buttons, underwire (bras), belts or buckles.

Some MRI scans involve having an injection of contrast dye. This makes certain tissues and blood vessels show up more clearly and in greater detail.

It’s possible for contrast dye to cause tissue and organ damage in people with severe kidney disease. If you have a history of kidney disease, you therefore may be given a blood test to determine how well your kidneys are functioning and whether it is safe to proceed with the scan.

An MRI scan is a painless procedure, so anaesthesia (painkilling medication) is not usually required. You can ask for a mild sedative to help you relax if you are claustrophobic. If you would like a sedative, you should ask your GP or consultant well in advance of having the scan.

If you decide to have a sedative during the scan, you will need to arrange for a friend or family member to drive you home afterwards as you will be unable to drive for 24 hours.

General anaesthetic (medication that makes you unconscious) is often used when young children and babies have an MRI scan. This is because it is very important to stay still during the scan, which young children and babies are often unable to do when they are awake.

During the scan

An MRI scanner is a short cylinder that is open at both ends. You will lie on a motorised bed that is moved inside the scanner. You will enter the scanner either head first or feet first, depending on the part of your body being scanned.

In some cases, a frame may be placed over the body part being scanned, such as the head or chest. This frame contains receivers that pick up the signals sent out by your body during the scan and it can help to create a better quality image.

A computer is used to operate the MRI scanner, which is located in a different room to keep it away from the magnetic field generated by the scanner.

The radiographer operates the computer, so they will also be in a separate room to you. However, you will be able to talk to them, usually through an intercom, and they will be able to see you at all times on a television monitor.

While you are having your scan, a friend or family member may be allowed to stay in the room with you. Children can usually have a parent with them. Anyone who stays with you will be asked whether they have a pacemaker or any other metal objects in their body. They will also have to follow the same guidelines regarding clothing and removing metallic objects.

To avoid the images being blurred, it is very important that you keep the part of your body being scanned still throughout the whole of the scan until the radiographer tells you to relax.

A single scan may take from a few seconds to three or four minutes. You may be asked to hold your breath during short scans. Depending on the size of the area being scanned and how many images are taken, the whole procedure will take between 15 and 90 minutes.

The MRI scanner will make loud tapping noises at certain times during the procedure. This is the electric current in the scanner coils being turned on and off. You will be given earplugs or headphones to wear.

You are usually able to listen to music through headphones during the scan if you want to, and in some cases you can bring your own CD of music you would like to listen to.

You’ll be moved out of the scanner when your scan is over.

After the scan

An MRI scan is usually carried out as an outpatient procedure. This means that you will not need to stay in hospital overnight. After the scan, you can resume normal activities immediately.

However, if you have had a sedative, a friend or relative will need to take you home and stay with you for the first 24 hours. It’s not safe to drive, operate heavy machinery or drink alcohol for 24 hours after having a sedative.

Your MRI scan will need to be studied by a radiologist (a doctor trained in interpreting scans and X-rays) and possibly discussed with other specialists. It is therefore unlikely that you will know the results of your scan immediately.

The radiologist will send a report to the doctor who arranged the scan, who will discuss the results with you. Unless they are needed urgently, it usually takes a week or two for the results of an MRI scan to come through.

Published Date
2014-02-06 12:43:01Z
Last Review Date
2013-09-04 00:00:00Z
Next Review Date
2015-09-04 00:00:00Z
Classification
MRI scan






NHS Choices Syndication


 /conditions/articles/mri-scan/how-does-it-work

Magnetic resonance imaging scan

How an MRI scan works

During a magnetic resonance imaging (MRI) scan, you lie in a strong magnetic field and radio-frequency waves are directed at your body. This produces detailed images of the inside of your body.

Most of the human body is made up of water molecules, which consist of hydrogen and oxygen atoms. At the centre of each hydrogen atom there is an even smaller particle called a proton. Protons are like tiny magnets and are very sensitive to magnetic fields.

When you lie under the powerful scanner magnets, the protons in your body line up in the same direction, in the same way that a magnet can pull the needle of a compass.

Short bursts of radio waves are then sent to certain areas of the body, knocking the protons out of alignment. When the radio waves are turned off, the protons realign and in doing so send out radio signals, which are picked up by receivers.

These signals provide information about the exact location of the protons in the body. They also help to distinguish between the various types of tissue in the body, because the protons in different types of tissue realign at different speeds and produce distinct signals.

In the same way that millions of pixels on a computer screen can create complex pictures, the signals from the millions of protons in the body are combined to create a detailed image of the inside of the body.

Published Date
2014-02-06 12:14:12Z
Last Review Date
2013-09-04 00:00:00Z
Next Review Date
2015-09-04 00:00:00Z
Classification
MRI scan






NHS Choices Syndication


Magnetic resonance imaging scan

Introduction

Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body.

An MRI scanner is a large tube that contains powerful magnets. You lie inside the tube during the scan.

An MRI scan can be used to examine almost any part of the body, including the:

  • brain and spinal cord
  • bones and joints
  • breasts
  • heart and blood vessels
  • internal organs, such as the liver, womb or prostate gland 

The results of an MRI scan can be used to help diagnose conditions, plan treatments and assess how effective previous treatment has been.

Read more about how MRI scans work.

What happens during an MRI scan?

During an MRI scan, you lie on a flat bed that is moved into the scanner. Depending on the part of your body being scanned, you will be moved into the scanner either head first or feet first.

The MRI scanner is operated by a radiographer, who is trained in carrying out X-rays and similar procedures. They control the scanner using a computer, which is in a different room to keep it away from the magnetic field generated by the scanner. 

You will be able to talk to the radiographer through an intercom and they will be able to see you on a television monitor throughout the scan.

At certain times during the scan, the scanner will make loud tapping noises. This is the electric current in the scanner coils being turned on and off. You will be given earplugs or headphones to wear.

It is very important that you keep as still as possible during your MRI scan. The scan will last between 15 and 90 minutes, depending on the size of the area being scanned and how many images are taken.

Read more about how an MRI scan is performed.

Safety

An MRI scan is a painless and safe procedure. You may find it uncomfortable if you have claustrophobia (fear of enclosed spaces), but most people find this manageable with support from the radiographer. Sometimes going into the scanner feet first may be easier, although this is not always possible.

MRI scans do not involve exposing the body to X-ray radiation. This means people who may be particularly vulnerable to the effects of radiation, such as pregnant women and babies, can use them if necessary.

However, not everyone can have an MRI scan. For example, they are not always possible for people who have certain types of implants fitted, such as a pacemaker (a battery-operated device that helps control an irregular heartbeat).

Extensive research has been carried out into whether the magnetic fields and radio waves used during MRI scans could pose a risk to the human body. No evidence has been found to suggest that there is a risk, which means that MRI is one of the safest medical procedures currently available.

Read more about who can and can’t have an MRI scan.

Published Date
2014-02-06 14:37:56Z
Last Review Date
2013-09-04 00:00:00Z
Next Review Date
2015-09-04 00:00:00Z
Classification
Brain,Joints,MRI scan,Spine




MRI scan – NHS Choices






























































MRI scan 

Introduction 

Health checks: later years

Once you reach the age of 65, you’ll be offered a range of NHS health checks including some specifically for older people

Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body.

An MRI scanner is a large tube that contains powerful magnets. You lie inside the tube during the scan.

An MRI scan can be used to examine almost any part of the body, including the:

  • brain and spinal cord
  • bones and joints
  • breasts
  • heart and blood vessels
  • internal organs, such as the liver, womb or prostate gland 

The results of an MRI scan can be used to help diagnose conditions, plan treatments and assess how effective previous treatment has been.

Read more about how MRI scans work.

What happens during an MRI scan?

During an MRI scan, you lie on a flat bed that is moved into the scanner. Depending on the part of your body being scanned, you will be moved into the scanner either head first or feet first.

The MRI scanner is operated by a radiographer, who is trained in carrying out X-rays and similar procedures. They control the scanner using a computer, which is in a different room to keep it away from the magnetic field generated by the scanner. 

You will be able to talk to the radiographer through an intercom and they will be able to see you on a television monitor throughout the scan.

At certain times during the scan, the scanner will make loud tapping noises. This is the electric current in the scanner coils being turned on and off. You will be given earplugs or headphones to wear.

It is very important that you keep as still as possible during your MRI scan. The scan will last between 15 and 90 minutes, depending on the size of the area being scanned and how many images are taken.

Read more about how an MRI scan is performed.

Safety

An MRI scan is a painless and safe procedure. You may find it uncomfortable if you have claustrophobia (fear of enclosed spaces), but most people find this manageable with support from the radiographer. Sometimes going into the scanner feet first may be easier, although this is not always possible.

MRI scans do not involve exposing the body to X-ray radiation. This means people who may be particularly vulnerable to the effects of radiation, such as pregnant women and babies, can use them if necessary.

However, not everyone can have an MRI scan. For example, they are not always possible for people who have certain types of implants fitted, such as a pacemaker (a battery-operated device that helps control an irregular heartbeat).

Extensive research has been carried out into whether the magnetic fields and radio waves used during MRI scans could pose a risk to the human body. No evidence has been found to suggest that there is a risk, which means that MRI is one of the safest medical procedures currently available.

Read more about who can and can’t have an MRI scan.

Page last reviewed: 05/09/2013

Next review due: 05/09/2015

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Comments

The 27 comments posted are personal views. Any information they give has not been checked and may not be accurate.

butterfly04 said on 24 September 2014

I wanted to reply to Cupcake on the previous post. What a terrible ordeal for you and for the staff not to reassure you is not acceptable. To make sure you can have your MRI done, you should contact your GP or consultant and ask them to put in a request for Individual Funding so that you can have the scan on an ‘open’ or ‘upright’ MRI machine (these are suitable for people with claustrophobia). Good luck and I hope your next experience is better than this one.

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cupcakequeen1 said on 15 September 2014

I have just returned home from my appointment today which was to have an MRI scan on my back. The scanning unit is in the car park just now, which I understand has cut the time of waiting for an appt down and I am all for. I had read up on the hospital website before this appt as I suffer from panic attacks in small confined spaces. It advises, you may be able to go in feet first if you are suffering with claustephobia, also you can have someone in with you, so I took my husband. Also you can take a music disc, this I did, all the things to help me get through it. Firstly, my husband was not allowed in as there is no waiting area for him, nobody asked did I have a disc to play, with the radiographers back to me he answered my question of am I ok to have this scan with a coil fitted, replying was it done in the EU ? then off we went into the scanning section, earplugs given and headphones in place of we go, with two inches approx to spare and the words are you ok, had the worst panic attack ever, came out of the machine for the radiographer to say are you ok we are not hear to tortchure you, that was the end of my scan, yeah my choice it never took place,. and I left with a mumble of we will let your GP know you could not go through with the scan, and that’s the way out. No alternative, no shalI get your husband, or anything just goodbye, I was in bits leaving that van. where’s the compassion and help and guidance gone. Yeah its my own fault, yeah I suffer with panic attacks, is there no help for this.

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User117967 said on 23 August 2014

Hi. Got an head MRI soon for Trigeminal Neuralgia & I am very worried about it. My main worry (silly i know) is that i have drawn on eyebrows with eyebrow pencil as i have overplucked my eyebrows to almost nothing. I am never seen without. Will I be made to remove them?????

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practive said on 13 August 2014

I had an MRI scan last Thursday (6 days ago). Since then, every time I get out of bed, bend down, stand up etc, I feel dizzy. I looked on the internet and found an article in the Daily Mail (23 Sept 2011) – the headline goes “MRI scans can make you dizzy: magnetic fields disrupt fluid in inner ear”.

It explains “MRI vertigo is caused by interplay between the magnetic field and the salty fluid that fills labyrinth canals, the scientists believe. The magnetic field is thought to push on the current of electrically charged particles circulating within the tubes. This in turn exerts a force on the cells which use the fluid’s flow to detect motion.”

I wasn’t warned about this possibility before the scan and I just don’t know how long the effects will last I wonder if others have been affected by this.

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PeerAdder said on 07 August 2014

Just had a scan to help diagnose nerve damage following a prolapsed disc. The scan itself was straightforward and easy – nothing to worry about. Some music would have been nice but I wasn’t in there for very long (about 20 minutes) and would probably have fallen asleep if it had been any longer.

One tip – get yourself comfortable quickly as (in my case at least) there wasn’t much time before the scan started. What I did notice was a slight tingling sensation in my chest and some tension in my arms when the scan was active. Not uncomfortable, but definitely there. For the record, to the best of my knowledge, apart from my fillings, my body is metal free! In any case, my head wasn’t being scanned.

Take a look at this article:

https://www.biac.duke.edu/research/safety/tutorial.asp#SF_3

which covers the whole process, and even includes a section on nerve stimulation which I’ve not seen anywhere else and which might possibly be the source of the tingling.

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Dutchie72 said on 08 May 2014

It’s been really useful reading some of these comments. I have chronic neck and back pain since falling off my bike, whilst triathlon training, nearly 4 years ago. I believe my chiropractor made my neck worse, a day after my last visit to him (6 weeks after falling off my bike), he said he was worried that I was getting any better. He asked me to come back the following week to get a second opinion from his colleague. I didn’t return as the next day, I woke up at 2 am, not being able to move my head due to excruciating pain. To cut a (very) long story short, after a short stay in hospital, being in continuous pain for months, finally having an X-ray 7ish months later, I was told I had a ‘loss of cervical lordosis’. Three years later, after many NHS physio appointments and cortisone injections, many visits to the doctors in tears, I am still in chronic pain. I have, this week, been told that I cannot have an MRI scan and that I will probably need more injections. This is rubbish! I am in constant pain, not just in my neck but by back too now. The first set of i jettisons worked for 7 weeks, the second didn’t. The ‘loss of cervical lordosis’, I could’ve always had. Reading some of these posts, I am a bit reluctant now to keep asking for an MRI scan, but at the same time, I want to know what’s going on. I am tired. I am not being listened to. I am seeing a physio tomorrow (privately) as I feel the NHS is letting me down. I am seeing NHS pain management again in July. Should I keep requesting for an MRI scan even though some of you had bad, long term symptoms? Thank you for taking the time to read this. Those of you, suffering from chronic pain, I understand. It is draining, tiring … something we shouldn’t have to put up with this day and age x

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Catgirlshirl said on 05 May 2014

Had a MRI today lasted 15 mins . Was very loud noises but I had a very nice lady radiographer talked me through it with intercom . It is very claustrophobic I never opened my eyes till I came out . Don’t worry about having a MRI just think it will find out what is wrong .

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Informed patient said on 20 April 2014

I had a lumbar MRI scan (non contrast) at The Circle Hospital in Bath on March 27th. Like "Babbity Blue" below I may have had an adverse reaction to the scan from which I am still suffering three weeks later. 48 hours after the scan I felt muscle pain all over my body.
This became worse and I suffered stiffness and swelling in my right leg and arm. A multitude of tests have been carried out and infections, a heart condition, a neurological condition and other suspected causes (e.g. flu) have been eliminated.

Everyone says that there is no known side effects to non-contrast MRI scans (e.g. where no blood dye is used), but I am not so sure.

I am still only semi-mobile and the doctors declare themselves baffled.

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fluffyfred said on 10 April 2014

Had MRI scan yesterday due to continued pain attacks after gallbladder removal. I was surprised that it takes years for some people to get a scan, but I had mine two months after my op. I’ll be surprised if it shows anything abnormal. It’s not I have no confidence in the scan, it’s just that I have a feeling that they’re going to say they can’t find what’s causing the pain attacks.
As for the scan itself, it is painless, unless you have scars. Where my gallbladder was removed, I had pain during the bit where I had to hold my breath. The pain hasn’t subsided (it’s not agony, just more uncomfortable).
I am claustrophobic, but apart from a little panic when I was being put into the scanner, where I felt like the room was spinning, everything else was fine. I was told I could take my own choice of music on CD, so I took one of my CDs where I knew the words to the songs, and during the noisiest part of the scan where I couldn’t hear the music, I could still sing along in my head which helped a lot. I was also provided with a blindfold as I was worried I’d open my eyes during the scan and panic.
I’ve had a couple of friends who found the radiographers to be abrupt when they were starting to panic, but the one who did mine was lovely and regularly checked I was still ok.
The other thing which helped a little as well, when I was sat in the waiting room, I could hear beeps and noises which were oddly calming. The radiographer confirmed that was the scanner, so although I was still nervous, it would have been worse had I not hear those noises. Obviously the experiences are different for people, but mine was good.

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shannan123 said on 07 April 2014

In response to Babbity blue’s post, I am a neuroscience PhD from the University of Sydney. In March 2013 I was running some research at the MRI facility our lab uses for my studies at NeuRA in Randwick, Sydney. I went into the scanner, having given the radiographer details of what was required for myself as a ‘control’ in that particular brain study (being run by one of my colleagues at Sydney Uni). Following approx one and a half hours of brain scanning I got out and left. However within a couple of hours that afternoon I developed a headache which, four days later had gradually increased to full-blown meningial inflammation. I was severely ill and in a huge amount of pain for 8 months with all the symptoms typical of meningitis.Under the care of my GP and was hospitalised 3 times. My neurologist has no idea how I developed meningitis (I also went down with pneumonia while I was so sick). Although my inflammatory markers were extremely high, no bacteria or virus was detected in numerous blood tests.

I remain in a lot of pain now, 13 months later. I’m unable to bear any vibration (can’t go in cars etc), no bright lights, no loud sound and no complex input (ie no TV, no radio, no electronic devices near my head such as phones). For months I was unable to even walk because of the vibration from my heels hitting the ground sending pain to my head. I am also unable to bead any sunlight on my head whatsoever. I must remain indoors and can only walk very short distances under a UV umbrella before the pain goes up – interestingly I’m able to bear hot water on my head (eg for washing my hair) so it’s not simply a matter of heat on my head.

It may be coincidental that I developed this inflammatory disorder immediately following the scan but I’d had lesser headaches following putting myself into the scanner on the 2 occasions previous to this extreme one. I hope you’re feeling better. If anyone else has experienced side-effects similar to these, please contact me.

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shannan123 said on 07 April 2014

I’m interested in Babbitty blue’s post. I am a neuroscience PhD from Sydney, Australia. In March 2013 I was running some research at the MRI facility I use for my studies. I put myself into the scanner, having given the radiographer the settings I required for myself as a ‘control’ in the brain study I’m running. Following one and a half hours of brain scanning I got out and left. However that afternoon I developed a headache which, four days later was full-blown meningial inflammation. I was severely ill and in a huge amount of pain for 8 months with all the symptoms typical of meningitis. My neurologist has no idea how I developed meningitis (I also went down with pneumonia while I was so sick). I remain in a lot of pain now, 13 months later. It may be coincidental that I have this inflammatory disorder immediately following the scan but I’d had lesser headaches following putting myself into the scanner on the 2 occasions previous to this extreme one. I just wonder how many people have inflammatory reactions to the massive magnetic field, leading to pains in the body or brain following MRI. My opinions and thoughts have been disregarded by the medical fraternity, in spite of me being a qualified neuroscientist myself, which leads me to wonder how many ‘ordinary’ members of the public might be being ignored if they experience inflammatory pain following MRI. I would be very interested to hear from anyone who’s had such reactions. I hope that you feel better soon and please persist in telling your GP or specialist how you feel. We, as medical professionals, can only make changes if we have feedback from patients and only then if we act on it appropriately. In my opinion this is not being done for MRI and it may in fact not be as safe for some people as it’s being made out to be.

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Babbitty blue said on 15 February 2014

I had an MRI scan a couple of weeks ago and since have suffered badly with pains throughout my body, my mobility is now very limited, I can barely walk and it is agony putting my body weight on my legs. I have been told the MRI scan has caused inflammation of my nervous system. Has anyone suffered with these side effects, are they permanent? I am really very anxious as the pain is so severe. The scan was a spinal scan and took one hour fifteen minutes. I am now almost virtually housebound.

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Gongon said on 31 January 2014

Had MRI scan last night as part of diagnosis of my prostate. Heard a few scare stories about claustraphobia and noise so was a little concerned.
As it happened, didn’t need to be.
Got changed into a gown, climbed onto table and was loaded into the machine!
Had some headphones put on with a little music but a bit too quiet as it happened.
Was given a panic button before I went in, then the machine started up with all sorts of strange noises (pops, bangs, buzzes.
Procedure took 35 minutes, at the end of which I was almost falling asleep!
Totally pain free and certainly nothing to be concerned about.
Have a biopsy next Tuesday then the diagnosis about 2 weeks away

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Richard Ormnd said on 02 January 2014

I had an MRIScan of my lower bowel today.i have had one before but being claustrophobic I was very apprehensive. As it turned out the worst bit was drinking what felt like a gallon of water with orange and having a cannula inserted. The scan took some time but was divided into short scans during which I had to hold my breath. I kept my eyes shut throughout and found that counting helped to distract me and also helped me to hold my breath. Although I was offered music and accepted I didn’t hear any.
I accidentally opened my eyes once and was relieved to see lighting and that the roof of the tunnel wasn’t as near to my face as I had imagined.
My advice is that the stress of the anticipation far outweighs the actual experience.lay back and relax,the time goes quite quickly.

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lots1 said on 09 November 2013

I had a MRI scan yesterday and was very, very nervous particularly having suffered from anxiety disorder. I hope this may help anyone worried about the procedure 🙂

I had my head scanned, so this was in the middle of the tube. From my waist down was still outside the tube.

You are laid down and as you go in your head slides into a "cage". This was much less scary than I anticipated as it is quite close and therefore your eyes can’t really focus on it properly, instead I focused on the mirror above which showed the outside and my feet.

There is a breeze flowing through the tube, which really helped reduce claustrophobia and you are given a button to squeeze if you need to speak to the staff, who were lovely.

Although I was given headphones the machine was very loud, but in no way unbearable and the staff kept talking to me between scans, to check I was OK. It can also vibrate a little, but not much. In total I was inside for about 20 minutes. The noises can help relieve the boredom actually!

There was the odd moment where I felt a little anxious, but these were fleeting and concentrating on my feet outside was enough to keep me calm. I was also pleased that as I wore no metal I did not have to change into a hospital gown (I wore jogging bottoms and jumper).

Good luck to anyone having a MRI, I hope this helps anyone worrying like I was.

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whoisthatchild said on 18 October 2013

I had my first ever MRI today for back problems. Trippy or what? As well as the warm tingly feeling I noticed a very small amount of pain in some scar tissue in my eyelid. It wasn’t really anything, but I chatted with the nurse about it afterwards and she confirmed I wasn’t imagining this. I should point out that I have a few scars, a lot bigger than this one, and none of the others felt anything. It must be something to do with the sensitivity or something of the eyelid. I also felt slight pains in various places in my back during the procedure, again nothing to write home about, but I noticed them nonetheless. The back pains could have been due to my back problem, but I felt them in places where my back doesn’t normally hurt, as well as my normal pain areas, so I am leaning towards putting this down to the MRI as well. I also felt a little "high", for want of a better description, and again I am putting this down to the effects of the scan. All in all very strange. Also strange is the fact that I am suffering a bit less than normal after the scan, again could well be due to the MRI.
Spoke to my dad who has had MRI previously and he says he felt nothing.
I must stress that in no way would this put me off having another scan. These pains were hardly pains at all, more like "feelings". Not even enough to make me flinch (you are not allowed to move in the scanner), so that was lucky.
It is very confined though and I closed my eyes all the way through and listened to the radio through the headphones. The worst part was by far the feeling of claustrophobia, but if that would put you off (and I do get claustrophobic) then maybe you don’t need the MRI. I would happily do it again if it were deemed necessary to help fix my back problem.

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Kirben said on 28 September 2013

I had an MRI scan on my pelvis yesterday and having read many people’s stories, I was very nervous. I had to have the contrast dye put in through my arm and it wasn’t painful and I couldn’t really feel it going into my vein. The radiographer explained everything and put my mind at ease and they provided music in the head phones which I suggest you ask for. Focusing on music helps you to relax and cuts out some of the noise. And yes it is noisy but not unbearable. You actually begin to realise when a new scan is starting and finishing by the noise the machine makes. The noise is bearable and actually the whole thing lasted only 25 minutes. So don’t panic, try and relax and ignore all the horror stories because it’s an ok procedure.

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User804970 said on 19 September 2013

Im 20 and have been experiencing chronic back pains since i was 15 🙁 im 21 this year and feel like im 50. I cant remember the last time i have woke up pain frwe. Its really getting to me now. I have been tested for numerous things and tested negative. I got to the doctors and come out with now answers every time, physio has been done and xrays etc. I broke my hand and thumb in my sleep one night and didnt even realise. Doctors thought my partner had been beating me and werent curious about it one bit considering i had done it in my sleep. Im just getting fed ofnot knowing what is the matter with me and wont even consider giving me an mri or more tests. Im getting very bitter about it as a girl can get a boob job over nhs because she isnt happy with a b cup but then there is people in the same situation as me and they still dont do anything about it 🙁 someone help me please

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Sprout01 said on 11 September 2013

I have suffered with a painful back, hips and knees for about 4years now. I’ve had x-rays, blood tests, physio, seen a rheumatologist and orthotics departments. Now, after all of that and having been on kapake and tramadol 3x a day, I’ve actually been referred for an MRI scan at last! The only thing I can suggest in getting a scan is, keep pestering the doctors. Good luck to everyone waiting for a scan or results.

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warriorsq said on 07 September 2013

York Tyler – There is a procedure to getting an MRI unless it’d deemed very serious

1st: doctor- should give painkillers and muscle relaxants for 4-6 weeks if that doesn’t work he/she is obliged to refer you to hospital (if they don’t after this period remind them it’s your legal NHS right!)

2: physio – the usual place you will be sent by your doctor at hospital is physio, they will asses you and usually give exercises to preform for about a month if after that you have no improvement they then should refer you to an MRI.

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York Tyler said on 25 August 2013

If only my partner could get an MRI scan! He’s in severe back pain and so bad we’ve seen an out of hours doctor at our local hospital. When it was suggested we were told they were reluctant to do it because of the costs. It makes me very angry to think that I have paid my dues for many years and then get treated in this way.

Has anyone else been refused. Prolonged pain is a sign that nerves could be damaged and this can be permanent and can mean loss of sensation or even partial paralysis. Isn’t that serious enough?

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osabanti said on 14 August 2013

My wife suffers from multiple health issue, i was told she can not fit the MRI scan because she is 24stone. i am so worried, is there any other way for her?

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dianexx said on 25 April 2013

hi, i had a mri scan on my right knee yesterday, i was a bit nervous bout haveing it done, theres nothing to worry about i was only in there for 20 mins theres abit of noise, take an cd with you to listen to.

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susieh13 said on 03 August 2012

Just got home from having an MRI at the John Radcliffe Hospital in Oxford, and have to say, as a claustrophobia sufferer, it was not as bad as I feared. I did keep my eyes closed the whole time, as, although there was a picture to look at, I could not see it properly without my glasses, so waste of time. The noises were a bit off-putting at the beginning but I started counting to myself, but soon gave up as I kept getting lost anyway. I had taken a Diazapam before I went, so I suppose that did help. All in all, not too bad, and I would not be so scared next time.

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milly j said on 15 May 2012

got my mri scan 2moz scanning my lower back bit nervous but readin these reports made me feel a bit more relaxed

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CathieG said on 04 June 2011

This is a quick down to earth explanation. For further information there are tabs near the top of the page for more in-depth facts for those who need them.

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rrsheard said on 15 February 2011

Far too short and lacking in information. Maybe should have links to more info

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CT scan

A CT scan uses a series of X-rays to produce very detailed pictures of the inside of your body










NHS Choices Syndication


Magnetic resonance imaging scan

Who can have an MRI scan?

Magnetic resonance imaging (MRI) is very safe and most people can have the procedure, including pregnant women and babies.

However, there are some instances where an MRI scan may not be recommended because the strong magnets used during the scan can affect any metal implants or fragments in your body.

Before having an MRI scan, you should tell medical staff if you think you have any metal in your body, such as:

  • a pacemaker – an electrical device used to control an irregular heartbeat
  • an implantable cardioverter-defibrillator (ICD) – a similar device to a pacemaker that uses electrical shocks to regulate heartbeats
  • a nerve stimulator  an electrical implant used to treat long-term nerve pain
  • a cochlear implant – a device similar to a hearing aid that is surgically implanted inside the ear
  • a drug pump implant – used to treat long-term pain by delivering painkilling medication directly to an area of the body, such as the lower back
  • brain aneurysm clips  small metal clips used to seal blood vessels in the brain that would otherwise be at risk of rupturing (bursting)
  • metallic fragments in or near your eyes or blood vessels (common in people who do welding or metalwork for a living)
  • prosthetic (artificial) metal heart valves
  • penile implants  used to treat erectile dysfunction (impotence)
  • eye implants – such as small metal clips used to hold the retina in place
  • an intrauterine device (IUD)  a contraceptive device made of plastic and copper that fits inside the womb
  • artificial joints – such as those used for a hip replacement or knee replacement
  • dental fillings and bridges
  • tubal ligation clips – used in female sterilisation (an operation that permanently prevents a woman being able to get pregnant)
  • surgical clips or staples – used to close wounds after an operation

Having something metallic in your body does not necessarily mean you cannot have an MRI scan, but it is important for medical staff carrying out the scan to be aware of it. This is so they can decide on a case by case basis if there are any risks, or if further measures need to be taken to ensure the scan is as safe as possible.

For example, you may be able to have an MRI with a pacemaker or defibrillator if a cardiologist (heart specialist) or another trained healthcare professional is able to make the device MRI-safe. They will also need to carefully monitor your heart rhythm during the procedure.

If you’re unsure about whether or not you have metal fragments in your body, you will need an X-ray to confirm whether this is the case.

Tattoos

Some tattoo ink contains traces of metal, but most tattoos are safe in an MRI scanner. Tell the radiographer immediately if you feel any discomfort or heat in your tattoo during the scan.

Pregnancy

There is no evidence to suggest MRI scans pose a risk during pregnancy. However, as a precaution MRI scans are not usually recommended during pregnancy, particularly in the first three months.

Published Date
2014-02-06 12:30:52Z
Last Review Date
2013-09-04 00:00:00Z
Next Review Date
2015-09-04 00:00:00Z
Classification
MRI scan


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