What is the result of increasing the wall filter during Doppler sampling?

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

What is the result of increasing the wall filter during Doppler sampling?

Explanation:
Increasing the wall filter raises the cutoff frequency for Doppler signals, functioning as a high-pass filter that suppresses low-frequency components. Those low frequencies come from slow flow and tissue motion. So when you raise the filter, you remove more of these near-zero velocity signals, leading to a reduced display of low-frequency Doppler signals. The wall filter changes which frequencies are passed rather than the overall system bandwidth, so its main observable effect is the diminished presence of the slow, low-frequency signals.

Increasing the wall filter raises the cutoff frequency for Doppler signals, functioning as a high-pass filter that suppresses low-frequency components. Those low frequencies come from slow flow and tissue motion. So when you raise the filter, you remove more of these near-zero velocity signals, leading to a reduced display of low-frequency Doppler signals. The wall filter changes which frequencies are passed rather than the overall system bandwidth, so its main observable effect is the diminished presence of the slow, low-frequency signals.

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