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Medical imaging

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Question 10

During a diagnostic X-ray procedure of the gastrointestinal tract, a barium meal containing barium (Z=56Z = 56Z=56) is administered as a contrast medium to improve image contrast against the surrounding soft tissue (average atomic number Z=7.0Z = 7.0Z=7.0).

Assuming that photoelectric absorption is the dominant attenuation mechanism for the X-ray energies used, what is the approximate ratio of the linear attenuation coefficient of the barium contrast medium to that of the surrounding soft tissue?

A

888

B

646464

C

512512512

D

409640964096

Markscheme

Medical imaging Questions

  1. A Level
  2. /Physics
  3. /Medical imaging

25 exam-style questions on OCR A A Level Physics Medical imaging, covering Using X-rays, Diagnostic methods in medicine, and Using ultrasound. Each one has a worked solution and a mark scheme showing where the marks go.

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