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Medical imaging

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Question 11

A sample of synthetic polymer gel used to calibrate medical ultrasound phantoms has a volume of 4.5 cm3 and a mass of 4.95 g. The speed of ultrasound in this gel sample is 1540 m s-1.

What is the acoustic impedance of the polymer gel?

A

1.69×103 kg m−2 s−11.69 \times 10^3\text{ kg m}^{-2}\text{ s}^{-1}1.69×103 kg m−2 s−1

B

1.69×104 kg m−2 s−11.69 \times 10^4\text{ kg m}^{-2}\text{ s}^{-1}1.69×104 kg m−2 s−1

C

1.69×106 kg m−2 s−11.69 \times 10^6\text{ kg m}^{-2}\text{ s}^{-1}1.69×106 kg m−2 s−1

D

1.69×109 kg m−2 s−11.69 \times 10^9\text{ kg m}^{-2}\text{ s}^{-1}1.69×109 kg m−2 s−1

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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