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Compression in ultrasound imaging adjusts the range of grayscale displayed, affecting the contrast resolution. This function allows sonographers to enhance the differentiation between structures of varying echogenicities. By modifying the contrast resolution, sonographers can better visualize subtle differences in tissue composition and improve the diagnostic quality of the images. Increasing contrast resolution is particularly important in differentiating between fluid-filled cysts and solid masses. Reference: ARDMS Sonography Principles and Instrumentation guidelines on image processing and contrast resolution.