ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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If an ultrasound image displays high contrast, what correlates with the dynamic range?

  1. A display of many shades of gray

  2. Narrow dynamic range

  3. No effect on the range

  4. Wide dynamic range

The correct answer is: Narrow dynamic range

A narrow dynamic range correlates with high contrast in an ultrasound image. This means that there is a small range of gray shades displayed, which enhances the differentiation between tissues with varying echogenicity. In contrast, a wide dynamic range would display a greater range of gray shades, which could reduce the overall contrast in the image. Therefore, in this context, the correct answer is an explanation of why narrow dynamic range correlates with high contrast in ultrasound imaging.

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