10 votes
Accepted

How do we differentiate the truncus coeliacus from the superior mesenteric artery?

You’re right that the origin of these two vessels can look similar where they branch from the aorta. One way to distinguish them is the level of their origin: The celiac trunk, also known as the ...
Chris's user avatar
  • 3,304
4 votes
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Can radiography procedures in medicine use gamma radiation?

X-rays and gamma radiation X-rays and gamma radiation are both types of electromagnetic radiation. X-rays originate from outside the nucleus of an atom (interactions of electrons), whereas gamma ...
Chris's user avatar
  • 3,304
4 votes

Information on the FLUENTAL ® moderator/ shifter. How and who made it?

After looking (without result!) at loads of pages returned from a Bing search for BNCT, I hit upon searching for: FLUENTAL moderator The first reference I looked at was: Use of TEPCs for ...
JMP's user avatar
  • 1,513
3 votes
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Distinguishing gallbladder polyps vs gallbladder cancer on ultrasound

Gallbladder cancers can only definitely be diagnosed or ruled-out with a biopsy. However, as biopsies are an invasive procedure, you can‘t just biopsize everyone routinely to check for gallbladder (...
Narusan's user avatar
  • 6,772
3 votes
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Is there a name for color coding B-Mode ultrasound?

I think I know what you mean - they're different color maps in lieu of the usual grayscale. I've very rarely seen them used by physicians and it is impossible to find screenshots online (sadly these ...
Anastasios Tsarouchas's user avatar
3 votes

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

You most definitely do not want to be in an MRI machine during an earthquake. The superconducting magnets in an MRI scanner are cooled by liquid helium. If the cooling system is damaged and there is a ...
StrongBad's user avatar
  • 1,462
3 votes
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What to do when an earthquake hits while inside a MRI?

Do nothing, stay inside the MRI machine. I never performed MRI scan in the past but I had experience of several quite big earthquakes within the last 10 years. So I provide my thought on this for ...
Chris Gao's user avatar
  • 156
2 votes

What is the additional diagnostic benefit of an intravenous contrast agent when examining the urinary system with CT?

Nephrolithiasis specifically refers to calculi (calcium stones) in the kidneys, but renal calculi and ureteral calculi (ureterolithiasis) are often discussed in conjunction. Ureteral calculi almost ...
Chris Rogers's user avatar
  • 6,166
2 votes

Does a radiologist adjust the amount of radiation for each individual?

According to this Harvard Medical article, in order to x-ray an arm or leg the average dose is 0.001mSv with a range reported in literature of 0.0002—0.1mSv. A lumbar spine x-ray would require an ...
Chris Rogers's user avatar
  • 6,166
2 votes
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Does the Sievert unit account for how concentrated the radiation dose was?

"Effective dose" is not a physical quantity, but a calculated summary value meant to evaluate the risk of some radiation exposure to other sources and to set occupational limits. From Fisher ...
Bryan Krause's user avatar
  • 13.9k
2 votes
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What is the meaning of "group-by-region interaction effects" (PET scan study of brains affected by schizophrenia)?

The authors did an experiment with two independent variables: group and region. The groups are "schizophrenia" and "no schizophrenia" (controls). The a priori regions were the frontal cortex, anterior ...
Bryan Krause's user avatar
  • 13.9k
2 votes

DICOM SliceThickness proximity

The slice location can be easily computed by looking at the (0020, 0032) ImagePosition tag. This tag is described in the DICOM Documentation Part 3 (page 561) and it's a type 1 attribute, i.e. it's ...
blunova's user avatar
  • 131
2 votes
Accepted

Ultra Sound Gender Prediction Accuray

Fetal gender determination is suprisingly accurate, according to this study: Accuracy of sonographic fetal gender determination: predictions made by sonographers during routine obstetric ultrasound ...
Chris's user avatar
  • 3,304
2 votes
Accepted

Does this paper report miscalculated metrics?

As the other answer points out, the authors here have clearly calculated the positive and negative predictive values (PPV and NPV) rather than sensitivity/specificity. They report these clearly in ...
Bryan Krause's user avatar
  • 13.9k
2 votes

Does this paper report miscalculated metrics?

It seems that they meant to say PPV(positive predictive value) and NPV instead of sensitivity and specificity. This provided a positive predictive value (PPV) of 0.85 and a negative predictive value (...
Mesentery's user avatar
  • 642
2 votes

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

Via the UCLA Brain Mapping Center, in the event of (emphasis and formatting added): Non-Fire Facility Emergencies Unscheduled Power Shutdowns Earthquakes Magnet Quench (catastrophic ...
Bryan Krause's user avatar
  • 13.9k
1 vote

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

An MRI scanner involves three magnetic fields: B0, the main magnetic field produced by the scanner, which is relatively static. Gradient field, produced by the gradient coils to tune 'slices' of the ...
Michael's user avatar
  • 689
1 vote

What is the additional diagnostic benefit of an intravenous contrast agent when examining the urinary system with CT?

To help answer your question, if we are independently suspecting urinary calculi (whether it is within the kidney, ureter, or bladder), the imaging of choice is a CT scan without contrast. The reason ...
Jrapa86's user avatar
  • 301
1 vote

Information on the FLUENTAL ® moderator/ shifter. How and who made it?

Fluental is a drug sold in Italy. It's a combination of acetaminophen (paracetamol) and sobrelol, which is a mucolytic. Basically, it's a cold remedy. It is manufactured by Sanofi.
Carey Gregory's user avatar
  • 9,813
1 vote
Accepted

is RADIO-SIGNAL Jammer safe for health?

Assuming you're in the U.S. and the jammer is mounted atop your building, you need to do an environmental assessment if your transmit power is over 1000 watts. However, as Carey Gregory mentioned, if ...
watkipet's user avatar
  • 211
1 vote
Accepted

Could hairline fractures be obscured by x-ray images

It is difficult to judge, as we don’t know whether your fracture resulted from an acute direct trauma or whether it is a so called “stress fracture” (due either to an abrupt increase in activity or to ...
M. Arrowsmith's user avatar

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