Radiation protection: radiation dose reduction in CT: 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.

Try it

Radiology · Radiation protection: radiation dose reduction in CT

Sample item

Which of the following methods does NOT reduce patient dose in CT?

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

The answer and the reasoning

D. Increasing the tube current without need

Dose in CT is proportional to mAs, so unnecessary increase raises exposure. Tube current modulation, iterative reconstruction and tailored scan range reduce dose while preserving diagnostic quality. Children need weight-based protocols.

Option by option

  • A. Automatic exposure control

    Automatic exposure control adapts the dose to the patient size.

  • B. Iterative reconstruction

    Iterative reconstruction allows lower dose at the same noise.

  • C. Limiting scan length to the region of interest

    Limiting the range avoids unnecessary exposure.

  • D. Increasing the tube current without need (correct)

    Correct. Higher mA increases dose.

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.

More Radiology questions

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is D, Increasing the tube current without need. Dose in CT is proportional to mAs, so unnecessary increase raises exposure.

Why is "Automatic exposure control" not the answer?

Automatic exposure control adapts the dose to the patient size.

Why is "Iterative reconstruction" not the answer?

Iterative reconstruction allows lower dose at the same noise.

Why is "Limiting scan length to the region of interest" not the answer?

Limiting the range avoids unnecessary exposure.

What concept does this question test?

It tests Radiation protection: radiation dose reduction in CT in Radiology. Tube current modulation, iterative reconstruction and tailored scan range reduce dose while preserving diagnostic quality. Children need weight-based protocols.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Radiation protection: radiation dose reduction in CT?

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.