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Medical imaging

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Question 8

A beam of diagnostic X-rays of intensity I0 I_0\,I0​ is incident on a layer of soft tissue of thickness ddd. In the absence of a contrast medium, the transmitted intensity through this layer is 0.50 I00.50\,I_00.50I0​.

To improve image contrast, a barium-based contrast medium is introduced, which increases the linear attenuation coefficient of this tissue layer by a factor of exactly 3.0.

Assuming the thickness d d\,d remains unchanged, what percentage of the incident intensity I0 I_0\,I0​ is transmitted through the tissue when the contrast medium is present?

A

16.7%16.7\%16.7%

B

79.4%79.4\%79.4%

C

12.5%12.5\%12.5%

D

5.0%5.0\%5.0%

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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