MRI physics: 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 · MRI physics

Sample item

Which MRI sequence is particularly useful for detecting restricted diffusion in acute ischaemic stroke?

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

The answer and the reasoning

A. Diffusion-weighted imaging

Diffusion-weighted imaging detects restricted water motion that develops early in acute cerebral infarction, often before changes appear on conventional sequences.

Option by option

  • A. Diffusion-weighted imaging (correct)

    Correct: DWI is highly sensitive to early cytotoxic oedema.

  • B. T1-weighted imaging

    T1 anatomy is less sensitive to hyperacute infarction.

  • C. MR angiography only

    Angiography evaluates vessels rather than diffusion directly.

  • D. Gradient echo only

    Gradient echo is especially useful for susceptibility effects.

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 A, Diffusion-weighted imaging. Diffusion-weighted imaging detects restricted water motion that develops early in acute cerebral infarction, often before changes appear on conventional sequences.

Why is "T1-weighted imaging" not the answer?

T1 anatomy is less sensitive to hyperacute infarction.

Why is "MR angiography only" not the answer?

Angiography evaluates vessels rather than diffusion directly.

Why is "Gradient echo only" not the answer?

Gradient echo is especially useful for susceptibility effects.

What concept does this question test?

It tests MRI physics in Radiology. The correct option holds because: Correct: DWI is highly sensitive to early cytotoxic oedema.

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 MRI physics?

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.