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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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?
Franck Dernoncourt's user avatar
6 votes
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How do we differentiate the truncus coeliacus from the superior mesenteric artery?

How do we differentiate the the truncus coeliacus from the superior mesenteric artery when looked at from an MRI in the axial plane? For example, the images that I attached, how can I differentiate 8 ...
Maria's user avatar
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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 ...
rnso's user avatar
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Does the age of an MRI scanner impact the quality of the scans?

I wonder whether the age of an MRI scanner (or how much it has been used) impact the quality of the scans. I.e., does the quality of the scans deteriorate as an MRI scanner gets older or more used? A ...
Franck Dernoncourt's user avatar
5 votes
1 answer
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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 ...
bluegray's user avatar
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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 ...
srcerer's user avatar
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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.
Ethunxxx's user avatar
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0 answers
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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....
Hinko Pih Pih's user avatar
3 votes
1 answer
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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?
xbmono's user avatar
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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 ...
user15910's user avatar
3 votes
1 answer
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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?
Fernet's user avatar
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1 answer
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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 ...
Pills N Pillows's user avatar
3 votes
1 answer
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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?
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3 votes
1 answer
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MR scanner versus MRI scanner

To designate a device that performs magnetic resonance imaging (MRI), is the proper term MR scanner or MRI scanner?
Franck Dernoncourt's user avatar
3 votes
1 answer
62 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 ...
LHM's user avatar
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1 answer
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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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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 ...
arthur.sw's user avatar
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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 ...
Franck Dernoncourt's user avatar
2 votes
2 answers
522 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 ...
einpoklum's user avatar
  • 518
2 votes
1 answer
864 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 ...
Sepideh Abadpour's user avatar
2 votes
1 answer
147 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 ...
Kate Gregory's user avatar
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1 answer
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Why do MRI Scan and CT Scan take more time than X- Ray?

I don't understand why do MRI Scan and CT Scan take more time than X- Ray? Depending on the size of the area being scanned and how many images are taken, the whole procedure will take 15 to 90 ...
Joseph. P's user avatar
2 votes
1 answer
57 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?
K22's user avatar
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1 answer
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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 ...
Franck Dernoncourt's user avatar
2 votes
1 answer
144 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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2 votes
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531 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 ...
Pills N Pillows's user avatar
2 votes
0 answers
46 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 ...
rsu's user avatar
  • 143
1 vote
3 answers
866 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 ...
Pills N Pillows's user avatar
1 vote
1 answer
40 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 ...
Franck Dernoncourt's user avatar
1 vote
1 answer
25k 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,...
Butterfly and Bones's user avatar
1 vote
1 answer
69 views

What is the difference between a regular and full body MRI?

I understand that normal MRIs use a "coil" which is wrapped around the body and the machine scans only the area where the coil is located and the area is only about 12-16 inches or so in ...
Tyler Durden's user avatar
1 vote
1 answer
50 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 ...
Franck Dernoncourt's user avatar
1 vote
1 answer
42 views

How to add MRI sections side by side in the MedDream DICOM viewer? [closed]

I'm trying to read MRI results. I want to have images side by side, like in this video: https://youtu.be/uO3xmPLrvvM?t=119 I'm using MedDream viewer online. It's the most convenient and I can't ...
teg_brightly's user avatar
1 vote
1 answer
121 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 ...
Web_Designer's user avatar
1 vote
0 answers
131 views

T1 weighting vs T2 weighting for monitoring a brainstem lession

https://www.researchgate.net/figure/1-Typical-values-of-relaxation-parameters-T1-and-T2-ms-for-Hydrogen-components-of_tbl1_291346848 I see from the table (various tables actually from diverse papers ...
George Ntoulos's user avatar
1 vote
0 answers
16 views

What does "poor suppression of CSF signal in the basal cisterns" mean?

What does "poor suppression of CSF signal in the basal cisterns" mean in head MRI findings? I've tried googling for it, but couldn't find anything about it.
Tofig Hasanov's user avatar
1 vote
0 answers
28 views

Why do water molecules diffuse along axons direction? [closed]

I am studying tractography technique which aims to reconstruct bundles of axons in brain by following the diffusion direction of water. It exploits the difference between grey matter and white matter: ...
HelpNeederStudent's user avatar
1 vote
0 answers
34 views

What is the meaning of "subcortical retraction" in a description of MRI of a Kearns-Sayre syndrome patient?

I came across the term subcortical retraction and cannot understand its meaning. Does it mean "the withering of the subcortical areas" (shrinking of subcortical white matter)? From Follow-up ...
CowperKettle's user avatar
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1 vote
0 answers
55 views

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 ...
healthy's user avatar
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1 vote
0 answers
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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?
ThePhysicist's user avatar
1 vote
0 answers
35 views

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 ...
BJC's user avatar
  • 11
1 vote
0 answers
29 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 ...
coolFactor's user avatar
1 vote
0 answers
118 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 ...
Sebastien Palcoux's user avatar
0 votes
1 answer
47 views

Is there commercially available MRI or CT that can be used for anthropometric rather than diagnostic purposes?

In research journals, there are often operationalisations of such terms as "muscle cross-sectional area", and "muscle volume", and "adipose tissue volume" by means of MRI ...
forgodsakehold's user avatar
0 votes
1 answer
496 views

What would be the consequence if one does not drink a lot of water immediately after an MRI with contrast agent (intravenously injected)? [closed]

Since the most commonly used compounds for contrast enhancement are gadolinium-based, which is toxic, would drinking very little water over the e.g. 5 hours after the MRI procedure result in some long-...
Aqqqq's user avatar
  • 131
0 votes
1 answer
59 views

Are the Tesla values of an MRI only related to the external static magnetic field?

Does a 3T MRI have 3 Tesla as magnetic field strength related to the external superconducting constant magnetic field or does it also include the maximum magnetic field strength at the position where ...
iwab's user avatar
  • 119
0 votes
1 answer
876 views

"Focal tear of the [ligament name]" vs. "Tear of the [ligament name]"

I am reading some MRI report and see "Focal tear of the [ligament name]". what does the adjective add? In other words, what is the difference between "Focal tear of the [ligament name]&...
Franck Dernoncourt's user avatar
0 votes
1 answer
883 views

Does a patient have to lie on their back (supine) for an MRI scan? [closed]

Could a patient be on their stomach or side during an MRI exam? I have had CT scans while on my side and it was no problem. The MRI technician says it is impossible to perform an MRI unless the ...
blacksmith37's user avatar
0 votes
1 answer
62 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 ...
Tony's user avatar
  • 181
0 votes
0 answers
41 views

Where can I find free cervical MRI files and cervical CT angiography files?

I would like to research cervical MRI and CT-angiography files of different people to understand more about cervical MRI and CT-angiography. I've only been able to find some other MRIs and CTs here: ...
teg_brightly's user avatar