Imaging modalities and physics: k-space: 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 · Imaging modalities and physics: k-space

Sample item

In MRI reconstruction, the data acquired from the central lines of k-space mainly determine which feature of the final image?

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

The answer and the reasoning

B. Overall signal intensity and tissue contrast

The centre of k-space holds low spatial frequencies, which supply most of the signal and the contrast. The periphery holds high spatial frequencies that give edge sharpness and fine detail. Slice thickness depends on the slice-select gradient and RF bandwidth.

Option by option

  • A. Slice thickness

    Slice thickness is set by the slice-select gradient and RF pulse bandwidth.

  • B. Overall signal intensity and tissue contrast (correct)

    Correct. Central k-space carries the bulk of signal and contrast.

  • C. Susceptibility to metal artefact

    Metal artefact depends on field strength and sequence type, not on which k-space lines are central.

  • D. Sharpness of fine edges and small details

    Fine edge detail is encoded in the outer lines of k-space.

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, Overall signal intensity and tissue contrast. The centre of k-space holds low spatial frequencies, which supply most of the signal and the contrast.

Why is "Slice thickness" not the answer?

Slice thickness is set by the slice-select gradient and RF pulse bandwidth.

Why is "Susceptibility to metal artefact" not the answer?

Metal artefact depends on field strength and sequence type, not on which k-space lines are central.

Why is "Sharpness of fine edges and small details" not the answer?

Fine edge detail is encoded in the outer lines of k-space.

What concept does this question test?

It tests Imaging modalities and physics: k-space in Radiology. The periphery holds high spatial frequencies that give edge sharpness and fine detail. Slice thickness depends on the slice-select gradient and RF bandwidth.

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 Imaging modalities and physics: k-space?

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.