Radiation 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 · Radiation physics

Sample item

Which modality uses ionizing X-rays to generate cross-sectional images?

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

The answer and the reasoning

A. Computed tomography

Computed tomography uses rotating X-ray beams and detectors to reconstruct cross-sectional images based on differences in tissue attenuation.

Option by option

  • A. Computed tomography (correct)

    Correct: CT uses ionizing X-rays for tomographic images.

  • B. Doppler only

    Doppler is an ultrasound technique for motion and flow.

  • C. Magnetic resonance imaging

    MRI uses magnetic fields and radiofrequency energy.

  • D. Ultrasound

    Ultrasound uses reflected high-frequency sound waves.

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, Computed tomography. Computed tomography uses rotating X-ray beams and detectors to reconstruct cross-sectional images based on differences in tissue attenuation.

Why is "Doppler only" not the answer?

Doppler is an ultrasound technique for motion and flow.

Why is "Magnetic resonance imaging" not the answer?

MRI uses magnetic fields and radiofrequency energy.

Why is "Ultrasound" not the answer?

Ultrasound uses reflected high-frequency sound waves.

What concept does this question test?

It tests Radiation physics in Radiology. The correct option holds because: Correct: CT uses ionizing X-rays for tomographic images.

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 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.