Nuclear medicine: 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 · Nuclear medicine

Sample item

Why is a ventilation-perfusion scan useful when CT pulmonary angiography is contraindicated?

AIt evaluates mismatched regional ventilation and perfusionBIt directly cultures pulmonary bacteriaCIt detects dental cariesDIt measures cardiac enzymes

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

The answer and the reasoning

A. It evaluates mismatched regional ventilation and perfusion

V/Q scanning compares airflow and blood flow; segmental perfusion defects with preserved ventilation can support pulmonary embolism in the right clinical setting.

Option by option

A. It evaluates mismatched regional ventilation and perfusion (correct)
Correct: mismatch patterns can indicate obstructed pulmonary blood flow.
B. It directly cultures pulmonary bacteria
It is not a microbiological culture test.
C. It detects dental caries
Dental caries require oral examination and dental imaging.
D. It measures cardiac enzymes
Cardiac enzymes are laboratory markers.

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, It evaluates mismatched regional ventilation and perfusion. V/Q scanning compares airflow and blood flow; segmental perfusion defects with preserved ventilation can support pulmonary embolism in the right clinical setting.

Why is "It directly cultures pulmonary bacteria" not the answer?

It is not a microbiological culture test.

Why is "It detects dental caries" not the answer?

Dental caries require oral examination and dental imaging.

Why is "It measures cardiac enzymes" not the answer?

Cardiac enzymes are laboratory markers.

What concept does this question test?

It tests Nuclear medicine in Radiology. The correct option holds because: Correct: mismatch patterns can indicate obstructed pulmonary blood flow.

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 Nuclear medicine?

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.