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Non-ionising imaging (A-level only)

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Question 7

A high-frequency veterinary ultrasound scan operating at 6.0 MHz is used to inspect the lower limb of a horse, specifically focusing on the interface between the superficial digital flexor tendon and the metacarpal (cannon) bone.

Data:

  • Speed of sound in equine tendon = 1650 m s-1
  • Density of equine tendon = 1120 kg m-3
  • Speed of sound in cannon bone = 3700 m s-1
  • Density of cannon bone = 1850 kg m-3
a.

Estimate the resolution of the ultrasound scan within the tendon tissue, under the assumption that the minimum resolvable detail is approximately equal to the wavelength of the ultrasound wave in that tissue.

[2]
b.

Calculate the acoustic impedance of both the tendon and the bone using the physical properties provided in the data table.

[3]
c.

Calculate the percentage of the incident ultrasound intensity that is successfully transmitted across the tendon-bone boundary.

[4]

Non-ionising imaging (A-level only) Questions

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  3. /Non-ionising imaging (A-level only)