ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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.