6 votes
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Effects of X-rays on the human body

A person should undergo Xrays as often an they are necessary, because the risk-to-benefit ratio is usually very far in favor of the benefit. As an example of this idea of risk-to-benefit ratio, lets ...
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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 ...
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  • 1,523
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 (...
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  • 6,596
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 ...
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  • 1,442
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 ...
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  • 156
3 votes
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How do I get screened for (ovarian) cancer?

Tests that can help detect ovarian cancer are pelvic exams, transvaginal ultrasounds, and some blood tests. 1 At least the first two are generally handled by gynecologist, and they are the specialists ...
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  • 6,998
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 ...
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  • 12.2k
2 votes
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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 ...
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  • 2,331
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 ...
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  • 5,872
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 ...
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  • 5,872
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 ...
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  • 12.2k
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 ...
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  • 12.2k
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 ...
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  • 131
2 votes
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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 ...
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  • 12.2k
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 (...
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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 ...
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  • 79
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.
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  • 9,435
1 vote
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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 ...
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  • 211
1 vote
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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 ...
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