Radiation safety and radiobiology: diagnostic reference levels: 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 · Radiation safety and radiobiology: diagnostic reference levels

Sample item

A hospital compares the typical CT head dose with the national diagnostic reference level and finds that its doses are well above it. What is the correct response?

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

The answer and the reasoning

B. Review and optimise the protocol

Diagnostic reference levels are benchmarks for typical doses and are not limits. Consistently exceeding them signals the need to review technique, such as mAs, pitch and protocols, without compromising diagnostic quality.

Option by option

  • A. Do nothing because the level is a legal dose limit

    A reference level is a guide for optimisation and not a limit.

  • B. Review and optimise the protocol (correct)

    Correct. Exceeding the reference level calls for an investigation of protocols.

  • C. Stop all CT head examinations

    Stopping all examinations is excessive since patient benefit is still real.

  • D. Increase kVp to lower the dose

    Raising kVp changes contrast and dose in complex ways and is not a systematic response.

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.

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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is B, Review and optimise the protocol. Diagnostic reference levels are benchmarks for typical doses and are not limits.

Why is "Do nothing because the level is a legal dose limit" not the answer?

A reference level is a guide for optimisation and not a limit.

Why is "Stop all CT head examinations" not the answer?

Stopping all examinations is excessive since patient benefit is still real.

Why is "Increase kVp to lower the dose" not the answer?

Raising kVp changes contrast and dose in complex ways and is not a systematic response.

What concept does this question test?

It tests Radiation safety and radiobiology: diagnostic reference levels in Radiology. Consistently exceeding them signals the need to review technique, such as mAs, pitch and protocols, without compromising diagnostic quality.

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 Radiation safety and radiobiology: diagnostic reference levels?

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.