SPI Exam Dumps | Which control should a sonographer use to change contrast resolution?

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Question 85/99

Which control should a sonographer use to change contrast resolution?

A. Reject

B. Output power

C. Gain

D. Dynamic range

Correct Answer: D

* Reject: This control eliminates low-level noise and weak signals, affecting image quality but not primarily used for contrast resolution.
* Output Power: This adjusts the intensity of the transmitted ultrasound waves but does not directly change contrast resolution.
* Gain: This control amplifies all signals equally, affecting brightness but not specifically the contrast resolution.
* Dynamic Range: Adjusting the dynamic range changes the range of grayscale that the ultrasound system displays, which directly affects the contrast resolution by altering how many shades of gray are visible between the black and white extremes.
References:
"Understanding Ultrasound Physics" by Sidney K. Edelman
ARDMS Sonography Principles and Instrumentation study materials

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