Which method is employed to reduce the presence of noise in the ultrasound system?

Which method is employed to reduce the presence of noise in the ultrasound system?

• A. System shielding
• B. Demodulation
• C. Rectification
• D. Compression

Answer: (A)

System shielding focuses on blocking external electromagnetic interference from reaching the ultrasound electronics. By enclosing cables and sensitive components in conductive shielding and ensuring proper grounding, stray electrical noise is attenuated before it contaminates the received echoes. This directly improves the signal-to-noise ratio, making the true reflections easier to distinguish. The other techniques are processing steps that occur after the signal is acquired. Demodulation extracts the desired information from a high-frequency carrier, rectification converts the signal for envelope detection, and compression adjusts the signal’s dynamic range for display. While they influence how the signal appears or is interpreted, they don’t reduce the amount of noise present in the received signal itself.

System shielding focuses on blocking external electromagnetic interference from reaching the ultrasound electronics. By enclosing cables and sensitive components in conductive shielding and ensuring proper grounding, stray electrical noise is attenuated before it contaminates the received echoes. This directly improves the signal-to-noise ratio, making the true reflections easier to distinguish.

The other techniques are processing steps that occur after the signal is acquired. Demodulation extracts the desired information from a high-frequency carrier, rectification converts the signal for envelope detection, and compression adjusts the signal’s dynamic range for display. While they influence how the signal appears or is interpreted, they don’t reduce the amount of noise present in the received signal itself.