Radiotherapy: image-guided radiotherapy: 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 · Radiotherapy: image-guided radiotherapy

Sample item

A prostate cancer patient's bladder and rectal filling vary between treatment days. Which approach corrects daily set-up and organ motion?

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

The answer and the reasoning

C. Image-guided radiotherapy with on-board imaging before each fraction

In image-guided radiotherapy, cone-beam CT or portal imaging is used to confirm the position of the target before delivery, allowing shifts that permit smaller margins and less normal tissue dose.

Option by option

  • A. Giving the entire dose in one fraction

    Single fraction treatment ignores the sparing benefits of fractionation.

  • B. Using larger fields without imaging

    Larger fields would add normal tissue toxicity.

  • C. Image-guided radiotherapy with on-board imaging before each fraction (correct)

    Correct. Daily imaging corrects positioning and organ motion.

  • D. Treating only with brachytherapy needles placed at random

    Random needle placement is not a valid technique.

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 C, Image-guided radiotherapy with on-board imaging before each fraction. In image-guided radiotherapy, cone-beam CT or portal imaging is used to confirm the position of the target before delivery, allowing shifts that permit smaller margins and less normal tissue dose.

Why is "Giving the entire dose in one fraction" not the answer?

Single fraction treatment ignores the sparing benefits of fractionation.

Why is "Using larger fields without imaging" not the answer?

Larger fields would add normal tissue toxicity.

Why is "Treating only with brachytherapy needles placed at random" not the answer?

Random needle placement is not a valid technique.

What concept does this question test?

It tests Radiotherapy: image-guided radiotherapy in Radiology. The correct option holds because: Correct. Daily imaging corrects positioning and organ motion.

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 Radiotherapy: image-guided radiotherapy?

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.