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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Why the T1 recovery & T2 decay are independent? [closed]
I was thinking that the decrease in transverse magnetization results in the recovery of longitudinal magnetization.
However, recently, I found it was wrong. I saw a diagram
(McRobbie 2014. ...
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Where can I find brain scans of people who "changed their preferences" over time
Hello, I hope this is the correct SE for my question. If not, Mods, please advise me where I need to go.
Background
Often people say, that they changed their preference with time. They dont eat ...
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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 ...
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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 ...
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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 ...
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Where can I find a list of MRI scanners ordered by the quality of the images they take?
I'd like to have a list of MRI scanners ordered by the quality of the images they take. The number of teslas is one parameter, but among MRI scanners with the same number it teslas, I'm told the image ...
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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 ...
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"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]&...
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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: ...
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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 ...
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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 ...
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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-...
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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.
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Meaning of "Routine" in "Routine imaging of the brain is not required to diagnose BH4Ds"
From Consensus guideline for the diagnosis and treatment of tetrahydrobiopterin (BH4) deficiencies
Recommendation #27 (conditional): Routine imaging of the brain is not required to diagnose BH4Ds.
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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 ...
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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 ...
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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: ...
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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 ...
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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 ...
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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....
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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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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 ...
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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 ...
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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?
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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 ...
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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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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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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 ...
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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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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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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?
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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?
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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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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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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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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 ...
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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 ...
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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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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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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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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 ...
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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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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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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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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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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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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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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 ...
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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?
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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 ...
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