ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Which one of the following applies when using tissue harmonics to image the gallbladder?

  1. Use of lower frequencies

  2. Use of higher frequencies

  3. Decreased lateral resolution

  4. Increased reverberation artifacts

The correct answer is: Use of higher frequencies

Tissue harmonics is a technique used in ultrasound imaging to improve image quality by reducing noise and improving contrast resolution. This is achieved by using a second harmonic frequency, which is twice the transmitted frequency. Option A is incorrect because using lower frequencies would make it more difficult to differentiate between different types of tissue and result in lower image quality. Option C is also incorrect because tissue harmonics actually improve lateral resolution. Option D is incorrect because tissue harmonics do not increase reverberation artifacts, but rather reduce them.

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