If a transducer system has a small dynamic range, which consequence is most likely?

• A. Soft echoes may be lost, reducing image contrast
• B. Strong echoes saturate, but soft echoes are preserved, improving detail
• C. The system's SNR improves
• D. Frame rate decreases

Answer: (D)

Small dynamic range means the system can map only a limited range of echo amplitudes to gray levels on the display. When this happens, high-amplitude echoes tend to saturate (clip) and low-amplitude echoes may not be represented at all, so subtle differences in tissue backscatter are lost. The result is poorer contrast resolution because the image can’t distinguish between nearby reflectivity levels, making soft echoes harder to see. In other words, soft echoes disappear into the background while strong echoes dominate, degrading overall image quality. Frame rate isn’t directly determined by dynamic range, so it wouldn’t be the most likely consequence.