Questions tagged [radiology]
Radiology is a medical specialty that uses imaging to diagnose and treat diseases seen within the body.
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What is Contrast in Medical Imaging
The term contrast gets thrown around alot but I always have a hard time understanding it. Can some please explain it to me. What is contrast in general when it refers to medical imaging? Second how ...
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rCVB tumor recurrence or radiation necrosis
Can rCBV (MRI Perfusion particularly Continuous ASL and DCE) accurately distinguish between tumor recurrence and radiation necrosis or pseudoprogression in gliomas or are Cho/NAA and Cho/Cr ratios the ...
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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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Would the anode heel effect happen in an un-angled anode?
If the anode of the x-ray machine had a uniform rectangular shape that was directly facing the cathode (not angled), wouldn't there still be a heel effect? I think that the intensity of the x-ray ...
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Can radiography procedures in medicine use gamma radiation?
Can radiography with gamma rays be used in medicine? If not, why not?
Is it a technical issue (gamma rays are not easy to generate or detect for this purpose) or is it a safety issue (gamma rays are ...
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Is there a name for color coding B-Mode ultrasound?
Recently i saw an ultrasound device which instead of displaying the image on a grayscale displayed the image on a color gradient scale from yellow (on the bright end) over red towards black (on the ...
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5 events of reoxygenation (in tumour cells)
I was asked this question in a seminar ,while I have understood the basic process ,I could not find specific mention of any such "events" in the books I referred to(Perez and Brady;Hall) or ...
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Does this paper report miscalculated metrics?
During a literature search I stumbled upon this paper, which evaluated the diagnostic accuracy of ultrasonography for the detection of gallstones (compared to the gold standard cholecystectomy).
Their ...
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Distinguishing gallbladder polyps vs gallbladder cancer on ultrasound
"On ultrasound a gallbladder polyp is seen as an elevation of the gallbladder wall that protrudes into the lumen. (...) A clearly infiltrating or large mass should be treated as a gallbladder ...
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What are typical entrance skin dose rates in radiography?
I am designing a radiation dosimeter, and I am trying to work out if it can detect the radiation rate/dose used in radiography procedures (with dosimeter placed on the patients body). I want to start ...
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What is the additional diagnostic benefit of an intravenous contrast agent when examining the urinary system with CT?
I read an overview of urinary calculi imaging, but the text was not clear as to the benefits vs risks of using a contrast agent to support CT imaging. The text did discuss use of a contrast agent ...
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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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Does a radiologist adjust the amount of radiation for each individual?
When performing an x-ray (in the UK specifically) does a radiologist use different settings based on which body part they are x-raying? Or do they have the machine on one setting for everyone? I'm ...
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Radiological Phantom Studies - Sampling with no People
I am writing a critical appraisal regarding a radiological study using an anthropomorphic imaging phantom. The phantom is constructed of materials that mimic human tissue but negate the need to ...
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Does the Sievert unit account for how concentrated the radiation dose was?
I often see different types of medical imaging effective doses compared to time required for an equivalent effective dose from background radiation.
For example, a dental x-ray is compared here:
... ...
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What study design is used in this research?
https://www.sciencedirect.com/science/article/abs/pii/S1939865415001113
I've learned about many types of study design including experimental (randomised control trials etc.) and observational study ...
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What is the meaning of "group-by-region interaction effects" (PET scan study of brains affected by schizophrenia)?
I was reading a recent study on schizophrenia and came across this sentence:
We found significant group and group-by-region interaction effects on volume of distribution (VT).
What is the ...
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How safe is low frequency radiation in I.T. edge cases? (5G, etc)
Closely Related: 5G Radiation Dangerous?
Being inundated with all kinds of 5G health statements, (for & against), I noticed a weird trend - the absence of cumulative radiation studies.
Question:
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DICOM SliceThickness proximity
I do have DICOMs (Digital Images and COmmunications in Medicine) from several CT volumes where most volumes miss the SliceThickness and SliceLocation attribute.
Is there another attribute usually ...
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Why don't we actively strugle to provide the highest LET particle radiation therapy, maybe with manganese, fluorine, nitrogen, iron, or osmium?
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3885128/
I am a cancer patient since 16, a medical student aiming for radiation oncology and subsidiary MSc&Phd in radiophysics. I am actually ...
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Information on the FLUENTAL ® moderator/ shifter. How and who made it?
The FLUENTAL® moderator/shifter appears often in the literature surrounding BNCT therapy. Google offers no search results with useful information on how it was made and whom by.
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Why is the Doppler angle setting supposed to be 60 degrees for arteries but 0 degrees for veins? [closed]
In ultrasonography, why isn't the Doppler angle correction supposed to be 60 degrees for veins just like it is for arteries?
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Does only the cumulative dose and not the dose rate matter for health effects of low-level radiation?
Most web articles related to negative health effects of radiation and radiation exposures from various sources (diagnostic scans, natural background radiation etc.) compare risk levels in terms of the ...
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How does cancer radiotherapy target only cancer cells? [closed]
I read about cancer treatment where the patient would be given radiation to kill cancer cells. How do they make sure that it affects mostly the cancer cells?
Moreover how do they manage it so that it ...
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Typical size for breast tumor at the beginning and at the end of radiotherapy treatment
I'd like to know if you know about sizes of breast tumors at the beginning and at the end of a typical radiotherapy treatment. I know that standard scheduled (50 Gy in 25 sessions) and ...
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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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is RADIO-SIGNAL Jammer safe for health?
Recently, I had to overview some WiFi technologies, and then wanted to check RADIOSIGNAL-BLOCKER hardware (a.k.a. WiFi/Cellural-Signal/Bluetooth/ Jammer).
We needed to use that technology to block ...
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Ultra Sound Gender Prediction Accuray
Sorry for a very basic Question (as I am a software engineer) but I am confused after getting material from internet about accuracy of Ultra Sound Gender prediction
Question: How much this is likely ...
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Could hairline fractures be obscured by x-ray images
I had fractured my ankle by the fracture of the fourth metatarsal was not seen in two X-rays that were taken. Only CT-scan revealed the cracks. Why is this the case? I was seen by an doctor who ...
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Are 3D-DSA and 3DRA the same?
This question is to radiologists.
I'm a PhD student in medical image processing and (I thought that) I was working with 3D-DSA images obtained by subtraction of non-contrast enhanced CBCT from a ...
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How do I get screened for (ovarian) cancer?
My wife faces infertility issues, and per a report on NBC news (http://www.nbcnews.com/health/cancer/can-infertility-point-ovarian-cancer-risk-n447901) she potentially faces a higher cancer risk for ...
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Effects of X-rays on the human body
What is the maximum number of times a person can safely undergo x-ray scanning? If this limit is exceeded, are there serious and/or life threatening side effects that the person may experience?
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