ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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How deep is a reflector if the go-return time of a sound wave is 39 us?

  1. 2cm

  2. 3cm

  3. 5cm

  4. 6cm

The correct answer is: 3cm

The correct answer is B. 3cm. The depth of a reflector can be calculated using the formula d = ct/2, where d is the depth, c is the speed of sound in the medium (assumed to be 1,540 m/s in soft tissue), and t is the go-return time of the sound wave. Given that the go-return time is 39 microseconds (or 39 × 10^-6 seconds), and the speed of sound is approximately 1,540 m/s, plugging these values into the formula gives us d = 1,540 × 39 × 10^-6 / 2 = 3cm. Therefore, the reflector is 3cm deep.

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