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Questions tagged [radiology]

Radiology is a medical specialty that uses imaging to diagnose and treat diseases seen within the body.

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1 vote
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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 ...
George Ntoulos's user avatar
6 votes
1 answer
280 views

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
  • 63
0 votes
1 answer
63 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
1 vote
0 answers
20 views

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 ...
Cosmic Dust's user avatar
1 vote
1 answer
62 views

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 ...
Julio Otuyama's user avatar
1 vote
1 answer
38 views

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 ...
Takirion's user avatar
  • 113
0 votes
0 answers
34 views

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 ...
atilla k's user avatar
2 votes
2 answers
257 views

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 ...
asdf's user avatar
  • 123
3 votes
1 answer
127 views

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 ...
user avatar
1 vote
0 answers
46 views

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 ...
Leo's user avatar
  • 111
2 votes
2 answers
67 views

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 ...
Tyler Durden's user avatar
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
2 votes
1 answer
67 views

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 ...
Ben Clarke's user avatar
0 votes
0 answers
62 views

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 ...
Rossco's user avatar
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5 votes
1 answer
135 views

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: ... ...
Curtis Howard's user avatar
0 votes
0 answers
37 views

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 ...
TPP's user avatar
  • 1
1 vote
1 answer
49 views

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 ...
CowperKettle's user avatar
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3 votes
0 answers
78 views

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: ...
elika kohen's user avatar
4 votes
1 answer
118 views

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 ...
turnman's user avatar
  • 41
0 votes
0 answers
53 views

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 ...
George Ntoulos's user avatar
1 vote
2 answers
163 views

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.
Cormac Gillen's user avatar
2 votes
0 answers
98 views

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?
user15038's user avatar
  • 101
1 vote
0 answers
36 views

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 ...
so2's user avatar
  • 111
1 vote
1 answer
176 views

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 ...
Allahjane's user avatar
  • 179
1 vote
0 answers
22 views

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 ...
Diego Ulloa's user avatar
1 vote
3 answers
926 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
2 votes
1 answer
285 views

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 ...
T.Todua's user avatar
  • 135
2 votes
1 answer
50 views

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 ...
Naveed Yousaf's user avatar
1 vote
1 answer
63 views

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 ...
BitsInForce's user avatar
3 votes
0 answers
62 views

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 ...
Hennadii Madan's user avatar
5 votes
1 answer
102 views

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 ...
ewitkows's user avatar
  • 153
9 votes
1 answer
11k views

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?
Akshay Vasu's user avatar
  • 3,354