Imaging physics: pulsed fluoroscopy: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · Imaging physics: pulsed fluoroscopy

Sample item

During a long interventional procedure the operator switches from continuous to pulsed fluoroscopy at a low frame rate. What is the main benefit?

ALower patient and staff dose, with acceptable image quality for slow-moving anatomyBElimination of scatter radiationCHigher contrast of iodineDBetter spatial resolution of bone

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Lower patient and staff dose, with acceptable image quality for slow-moving anatomy

Pulsed fluoroscopy emits short bursts and fewer frames per second, so the total exposure falls. It suits procedures with little motion. Dose reduction also follows from last-image hold and collimation.

Option by option

A. Lower patient and staff dose, with acceptable image quality for slow-moving anatomy (correct)
Correct. Fewer pulses mean a lower dose.
B. Elimination of scatter radiation
Scatter is reduced in proportion to dose but is not eliminated.
C. Higher contrast of iodine
Contrast depends on beam energy rather than pulsing.
D. Better spatial resolution of bone
Resolution is not improved by pulsing.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is A, Lower patient and staff dose, with acceptable image quality for slow-moving anatomy. Pulsed fluoroscopy emits short bursts and fewer frames per second, so the total exposure falls.

Why is "Elimination of scatter radiation" not the answer?

Scatter is reduced in proportion to dose but is not eliminated.

Why is "Higher contrast of iodine" not the answer?

Contrast depends on beam energy rather than pulsing.

Why is "Better spatial resolution of bone" not the answer?

Resolution is not improved by pulsing.

What concept does this question test?

It tests Imaging physics: pulsed fluoroscopy in Radiology. It suits procedures with little motion. Dose reduction also follows from last-image hold and collimation.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Imaging physics: pulsed fluoroscopy?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.