Questions tagged [mri]

Magnetic resonance imaging (MRI) is an imaging technology that employs various techniques (most notably magnetic fields) to capture the anatomy of a body.

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45
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2answers
4k views

Can MRI scans be dangerous for one's health?

Can MRIs have any deleterious effect on one's health? Or would it be safe to have say 5 MRIs per year?
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1answer
154 views

Pacemaker and MRI

Is it safe for patients with pacemakers to have MRI? Although earlier it used to be said that patients with pacemakers should not have MRI, but apparently some recent data says it is not that ...
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1answer
35 views

Does diffusion MRI (DWI & DTI) measure diffusion or osmosis?

I am trying to understand the physical property which is measured in diffusion weighted imaging (DWI) and diffusion tensor imaging (DTI). I read that these methods estimate the apparent diffusion ...
4
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1answer
2k views

Number of MRI scanners in the world today?

How many MRI scanners are there today in the whole world? My own search only revealed numbers in certain countries but no overall count.
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0answers
58 views

Are dehydration headaches visible on an MRI scan?

This article states following about dehydration headaches: Our brains are 80% water. When you become dehydrated your brain tissue loses water causing your brain to shrink and pull away from the skull....
3
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1answer
45 views

What does the intensity in an MR image represent?

Hounsfield units are frequently used as intensity for CT images. What is used for MR images?
3
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1answer
2k views

Dangers of having MRI, CT-scan, & X-ray within a seven day period?

I had a MRI last week for my spine. I got a call today that I'm having a CT-scan tomorrow for my abdomen (unrelated issue). The day after tomorrow, I'm having X-rays done on my teeth at the dentist ...
3
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1answer
233 views

Do all neurodegenerative diseases show up on an MRI scan?

Do all neurodegenerative diseases such as Parkinson's, Alzheimer's, etc. show up on an MRI scan?
3
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1answer
128 views

MR scanner versus MRI scanner

To designate a device that performs magnetic resonance imaging (MRI), is the proper term MR scanner or MRI scanner?
3
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1answer
46 views

What are normal structures that could be misinterpreted as lacunar strokes on T1 or T2 brain MRI?

Trying to detect lacunar strokes in brain MRI, in T1 they look like a small black hole, whereas in T2 bright-white; located within white matter region. My question is, are there any structures that ...
3
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1answer
74 views

MRI scans for diagnosing Crohn's disease?

How effective/accurate are MRI scans of the small intestine for diagnosing Crohn's disease?
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0answers
24 views

Automatic Quality Control of MRI

Is there any standard process to assess the quality of MRI images? The goal is to automatically detect really poor quality data (and then manually confirm the defects). I found some studies about ...
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0answers
48 views

DICOM MRI images resolution

I've received a CD with the results of my MRI. The images seem very grainy and the maximum resolution of the images is around 320x320px or 512x512px. Is this typical for these kind of images? It's ...
3
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0answers
145 views

Does the number of teslas matter when evaluating a tendinopathy with an MRI scanner?

The number of teslas in MRI scanners vary between 0.2 and 7 teslas, and sometimes even up to 10.5 Teslas (Siemens MAGNETOM 10.5T) and 11.7 teslas (Siemens MAGNETOM 11.7T). Does the number of teslas ...
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2answers
205 views

When is an MRI also an MRN?

I'm not a medical professional. I have just noticed the mention of MRN - Magnetic Resonance Neurography as a diagnostic tool for nerve issues. Now, I know that MRN is essentially a kind of MR ...
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1answer
792 views

what does this abnormality (arachnoid cyst) mean in a brain MRI?

In a Brain MRI (axial T1, T2, sagittal T1, axial T1 and FLAIR images) is written: CSF signal intensity lesion with 40x24x38mm diameter is seen in the anterior portion of left middle cranial fossa in ...
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1answer
53 views

How reliable is MRI to diagnose ACL (anterior cruciate ligament rupture)?

at the end of January 2019, I had an accident while skiing and was diagnosed shortly after with ACL (Anterior cruciate ligament rupture). The diagnosis was confirmed by 4 different doctors who all are ...
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1answer
104 views

What can you observe from MRI noises?

While in an MRI you hear a lot of different noises. The pitch changes, as does the pattern and rhythm. Sometimes there's one long noise, sometimes a beep-beep-beep then a pause and the same set of ...
2
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1answer
39 views

Where can I find head MRI files?

I have to calculate some anatomic values on different brains so I have to work on different MRI images for my project. Where can I find MRI images for this?
2
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1answer
58 views

What criteria should I pay attention to when choosing a place to perform an MRI?

What criteria should I pay attention to when choosing a place to perform an MRI? The MRI is done to diagnose the source of pain in an articulation (e.g., elbow tendinopathy). One criterion is the ...
2
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1answer
136 views

Is there a disease that involves progressive loss of feeling, a tremor, and muscle twitches? [closed]

I have seen multiple doctors, including a neurologist, who are bewildered by my symptoms. Upon altering the dose of lamotrigine from 400 mg to 375 mg, and then back up to 400 mg (split into two ...
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0answers
403 views

Why aren't fixed retainers (metal wires) behind front row of teeth affected by the MRI's? Isn't it magnetic?

I've had plenty of MRI's in my life, and I know the drill: take off the glasses, bra with a metal clasp, hair-tie with a metal band, all metal jewelry, etc. It makes sense. You don't want to put ...
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0answers
38 views

Cerebellar tonsil herniation measurement level?

In my MRI scan result the cerebellar tonsil detected had a measurement of 0.50 mm through the foremen magnum. Is this condition considered normal for a tall person or is it considered the beginning of ...
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3answers
462 views

What to do when an earthquake hits while inside a MRI?

As mentioned earlier, I had a MRI today... I wasn't in the waiting room for long so I didn't have a chance to read the bright yellow folder labeled "Earthquake Guide during a MRI." But as I walked ...
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1answer
35 views

How important is the experience of the radiologist to diagnose a tendinopathy when reading an MRI?

I read on {1}: Preoperative ultrasound examination of the shoulder permits a reliable diagnosis of complete rotator cuff tears and calcium deposits (calcific tendinitis). The method is less ...
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1answer
18k views

How to request copies of CT-Scans, MRI, X-rays & ultrasound/endoscopic imagery from Dr.'s/Surgeons for personal records? Possible?

Because of the many congenital-bone-fusions (due to Klippel-Feil-Syndrome) throughout my life, doctors have performed many, many medical-imaging tests (CT-Scans, MRIs, X-Rays, Ultrasounds, Endoscopies,...
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1answer
45 views

How can an MRI influence the treatment in case of an elbow tendinopathy?

I wonder what findings in an MRI may influence the treatment in case of an elbow tendinopathy. I have noticed that a fair amount of physicians (at least in the United States and in France) are ...
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1answer
77 views

Reading radiology reports: What do two numbers separated by a slash mean?

The following is an excerpt from the "findings" section of an MRI radiology report. What do the instances of two numbers separated by a slash mean? There is a lesion within the spinal canal at T2-3 ...
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1answer
12k views

What is a T2 hyperintense focus in the subcortical white matter?

What is a T2 hyperintense focus? What does it mean, in English, for there to be a T2 hyperintense focus in the subcortical white matter of the right middle frontal gyrus?
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Where is a CT scan better than an MRI, where is an MRI better than a CT scan, and where is an ultrasound better than the first two? [closed]

I've always assumed that a CT scan is better at "hard" objects, while an MRI is better at "soft" objects, but then I heard that CT scans (even without contrast) can be used to ...
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0answers
54 views

If EPR has better resolving power than NMR, why don't most MRI machines use EPR instead of NMR?

Most MRI machines use NMR imaging instead of EPR imaging even if EPR could provide a better image with more information. What could be the reason of this preference of technique?
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Looking for MRI file repository for Finite Element Modeling of ACL

Does anyone know of any online/open access MRI image collections? I am looking for 3D geometry for an ACL to mesh and model for a Finite Element Modeling course, and I'm having trouble locating source ...
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0answers
24 views

Is there an MRI proof of regenerated human intervertebral disc in the spine?

I have read lots of research reports, surveyed Regenexx, Mesoblast, even seen MRI proof of disc regeneration in animals. However I have yet to see a study where over 20 people benefited (Regenexx does ...
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0answers
114 views

Can arthrogram detect shoulder anomalies that MRI can not?

I went to an orthopedic hospital for a pain in my left shoulder since 6 months. They first did x-ray, and the report was: X-ray left shoulder shows reduction in subacromial space and subacromial ...
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1answer
52 views

Do I need to communicate with my doctor if I don't want to take prescribed MRI? [closed]

I got a prescribed brain MRI today from my doctor. Although I agreed to schedule the MRI next week, I find I am not ready to do that after I come home. I am very busy recently and my symptom is not ...
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0answers
24 views

Can thickened maxillary and ethmoidal sinuses cause headaches?

An 18 year old patient has had mild and constant daily headaches for two months. The headaches were most painful in the eyes and forehead area. His MRI was clean, apart from moderately thickened ...
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0answers
19 views

Altered signal intensity lesion in frontal horn of right lateral ventricle in subependymal region without post contrast enhancement

There is evidence of approximately 9*8 mm sized altered signal intensity lesion is noted in frontal horn of right lateral ventricle in subependymal region. Lesion appears hypointense on T1W, ...
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1answer
43 views

What kind of personal body scanning equipment can you legally buy? [closed]

I would like a personal body scanner. What kind of things can I buy that's legal and safe? Is a ultrasound safe and what kind of things can it see? I think an MRI scanner would be a bit too ...