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MRI

MRI stands for magnetic resonance imaging. It is a particularly useful scan for neurology, cardiology and oncology patients. Questions on how they work, their development and uses can go in this category.

800 Questions

Can you have an mri on your knee with rods in your back?

I have metal rods alongside my spine and have had several MRI's. It caused me to feel tingly where my rods are, and have some static electricity with my hair. The only issues were those above, and itchiness. They will weigh the risk of doing it with the risk of not.

What is MRI test?

MRI TechnologyUnpaired nuclei in an atom have a resultant spin. We apply a strong magnetic field, so that they align themselves (in their own ways!). Then we blast them with a radio frequency pulse to make them feel dizzy. However, the nuclei (proton) though perturbed, they revert back to their 'original' configuration; releasing an RF pulse that is detected. This 'pulse' is interpreted and visualized by the radiologists.

The above is an oversimplification, since in addition to this, we need to know how the nuclei 'relax': T1 & T2 relaxation.

You may learn more about this (in layman's as well as professional terms) in my blog article: Understanding the Basic Principles of Nuclear Magnetic Resonance Imaging. Please see the related link.

There's much more to it (e.g. relaxation) which I've also covered.

What is the difference between a brain scan and an brain MRI?

1.The MRI and fMRI differ from each other in a way that the MRI views the anatomical structure while the fMRI views the metabolic function.

2.An MRI studies the water molecule's hydrogen nuclei whereas an fMRI calculates the levels of oxygen.

3.An MRI's structural imaging views at a high resolution the differences between tissue types with respect to space. On the other hand, an fMRI's functional imaging views the tissue differences with respect to time.

4.The MRI has a high, spatial resolution while an fMRI has a long-distance, superior, temporal resolution.

5.When talking about its technological advancements, the fMRI is still starting to build up its name unlike the MRI wherein it is already at its peak as one of the widely used equipment technologies in the medical world.

6.The fMRI is yet to be introduced for diagnostic purposes and is only used in experiments unlike the revolutionary MRI.

7.The fMRI is considered to be more expensive than the MRI because of the additional software and hardware required fo

What are mri scans used for?

Doctors can get highly refined images of the body's interior without surgery, using MRI. By using strong magnets and pulses of radio waves to manipulate the natural magnetic properties in the body, this technique makes better images of organs and soft tissues than those of other scanning technologies. MRI is particularly useful for imaging the brain and spine, as well as the soft tissues of joints and the interior structure of bones. The entire body is visible to the technique, which poses few known health risks.

Can marijuana show up in an x-ray?

Certain brain changes occur with habitual canabis use which will show up on MRI. They are similar to changes seen in scitsophrenics so its worth admitting your habit before having the scan to prevent ending up in a pyschiatric unit!

Can Asperger's Syndrome be detected on an MRI scan?

Yes, it can be. A new scanning method that takes approximately 15 minutes has been developed to help diagnose an autistic spectrum disorder accurately. This is a procedure that confirms or clarifies ASD in a very reliable manner. Scientists have managed to identify parts of the brain associated with autism, when comparing with an ordinary functioning brain. This is with 90% accuracy, according to the institute of psychiatry at Kings College, London.

Not currently, no. Asperger's is a psychological diagnosis, based on behavioral traits. Those aren't detectible via an MRI.

At some point a Functional MRI may be able to determine a diagnosis based on reactions in the brain to specific stimuli, but this is not currently possible.

Does copper effect an MRI?

The Paragard and Mirena IUDs used in the United States do not interfere with safe MRI. Talk to your health care provider about what kind you have, or find the card you were given on insertion, and you'll be able to find information about your IUD and its safety during MRI.

What does mri results mean when they say Spondylotic changes at l3-4 and l4-5?

It refers to undesirable changes in the vertebral bodies and intervertebral discs in your spine. When their quality and alignment deteriorates, your spine's stability and flexibility decrease. These can be caused by injury and aging and can be faster or slower to show up depending on level of physical activity, genetics, nutrition, etc. Usually they are associated with disc compression which may lead to pinching of nerves in your spine.

What is a motion artifact on a MRI mean?

An artifact is any feature which appears on the image which is not present on the original object. These can be caused by things such as machine calibration, blood flow, etc.

Why does an MRI cost so much?

DR RICHARD WATTS

The main cost of the MRI scanner is in generating this very large, very uniform magnetic field. And the way that we do that is using super conducting wires. So super conducting materials have this unique property that they have no electrical resistance. It's not nearly nothing, it's absolutely nothing. So once you start a current flowing through these coils that current will continue to flow essentially forever. So the main cost of the MRI scanner is this coil of wire, and to keep that coil of wire super-conducting, to keep it with zero resistance we have to keep it very cold. And we keep it cold using liquid helium. Liquid helium is four degrees above absolute zero, absolute zero is minus 273 degrees celcius. And when you look at the MRI scanner itself, what you're looking at is a big tub that contains several thousand litres of liquid helium.

Reference:

http://www.sciencelearn.org.nz/contexts/see_through_body/sci_media/why_does_an_mri_cost_so_much

Any suggestions on how to get through an MRI when you're clostraphobic?

Ive had a MRI and iam claustrophobic and it was not all that bad if its on your foot then that's best.

What are similarities between MRI and CAT scans?

Other than the fact that it creates an image of your body for medical purposes...absolutely nothing.

Xray uses ionizing radiation (the potentially harmful kind) which passes through your body. Some of it comes out the other side and reacts with a detector that is behind your body. This creates an image by reflecting how much of the radiation passes through. This is dependent upon what type of tissue it is passing through. Bone, for example, will not allow as much to pass through as soft tissue such as fat or muscle.

MRI is very different and quite complicated. It creates images by measuring the way hydrogen molecules in your body react to a magnet. One of the magnets is switched on and off rapidly and the reactions of the hydrogen molecules will depend upon what type of tissue is there. Hydrogen molecules in fat, for example, are attracted to the magnet very quickly, while hydrogen in water will move more slowly. This is the concept used to get images. It does not use the harmful type of radiation like Xray.

Can you have an MRI of neck with screws and plate in ankle?

Depends on the type of mental the screw is made of, some metals are MRI safe whilst older ones are not. Details of this will be in your medical records (the operation report) at the hospital where you had the screw put in your knee. Some people are given a piece of paper to carry after an operation where metal is placed in them detailing exactly what was used if you have one of these show it to the doctor treating your knee.

Can you have an MRI if you have metals in your body?

The attendant will ask about what you have in your body--piercings, hip replacements, medicine patches with metal backing--and then will tell you what you have to do. They do not want the metal to shift during the scan.

How often can an MRI be performed on the same person safely?

MRI uses high magnetic fields and radio frequency and not x-ray. The procedure is generally safe and typically repeated examinations do not cause any problems.

However, some MRI scans use a Gadolinium-based contrast agent, so repeating MRI scans within a few days may expose a patient to higher-than-expected levels of the contrast agent in the blood, which can be affected by kidney function. Patients should check with their doctor before having a repeat contrast MRI scan within a few days.

How MRI works?

As the patient enters an MRI scanner a large magnet surrounds the patient. The scanner subjects nuclei of the body's atoms to a radio signal, temporarily knocking select ones out of alignment. When the signal stops, the nuclei return to the aligned position, releasing their own faint radio frequencies, which are sent to a computer to build up detailed images of the patient's anatomy.

What does an MRI scan do?

An MRI machine uses radio waves and a very, very strong magnetic field to take pictures of the soft body tissues. The radio waves and magnet align the spin of protons and these allow images to be taken.