Radiation safety and radiobiology: dose limits and patients: 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: dose limits and patients

Sample item

A radiology resident asks whether the annual occupational dose limit also caps the radiation a patient may receive from medically indicated CT scans. What is the correct answer?

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

The answer and the reasoning

D. No, patient exposure is controlled by justification and optimisation, not by dose limits

Dose limits apply to occupational and public exposure. Medical exposure of patients is governed by justification of the examination and optimisation of the dose, with diagnostic reference levels used as benchmarks.

Option by option

  • A. Yes, but patients are limited to the public dose limit

    The public limit is for non-medical exposure of the public and does not cap patient scans.

  • B. Yes, patients are limited to the same annual dose

    Occupational limits do not apply to patients.

  • C. No, patients have no safeguards at all

    Patients are protected by justification, optimisation and reference levels.

  • D. No, patient exposure is controlled by justification and optimisation, not by dose limits (correct)

    Correct. The benefit to the patient is weighed in each case, and no fixed limit applies.

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 D, No, patient exposure is controlled by justification and optimisation, not by dose limits. Dose limits apply to occupational and public exposure.

Why is "Yes, but patients are limited to the public dose limit" not the answer?

The public limit is for non-medical exposure of the public and does not cap patient scans.

Why is "Yes, patients are limited to the same annual dose" not the answer?

Occupational limits do not apply to patients.

Why is "No, patients have no safeguards at all" not the answer?

Patients are protected by justification, optimisation and reference levels.

What concept does this question test?

It tests Radiation safety and radiobiology: dose limits and patients in Radiology. Medical exposure of patients is governed by justification of the examination and optimisation of the dose, with diagnostic reference levels used as benchmarks.

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: dose limits and patients?

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.