CT 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 · CT physics

Sample item

Which CT artefact is commonly produced by metal hardware?

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

The answer and the reasoning

A. Beam-hardening streak artefact

Dense metal attenuates X-rays strongly and creates beam-hardening and photon-starvation streaks that can obscure adjacent anatomy on CT.

Option by option

  • A. Beam-hardening streak artefact (correct)

    Correct: metal commonly produces CT streak artefact.

  • B. Chemical shift artefact

    Chemical shift is an MRI phenomenon.

  • C. Doppler aliasing

    Aliasing occurs with Doppler sampling.

  • D. Posterior acoustic enhancement

    Acoustic enhancement is an ultrasound effect.

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.

More Radiology questions

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is A, Beam-hardening streak artefact. Dense metal attenuates X-rays strongly and creates beam-hardening and photon-starvation streaks that can obscure adjacent anatomy on CT.

Why is "Chemical shift artefact" not the answer?

Chemical shift is an MRI phenomenon.

Why is "Doppler aliasing" not the answer?

Aliasing occurs with Doppler sampling.

Why is "Posterior acoustic enhancement" not the answer?

Acoustic enhancement is an ultrasound effect.

What concept does this question test?

It tests CT physics in Radiology. The correct option holds because: Correct: metal commonly produces CT streak artefact.

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 CT 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.