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Table 4 Settings for detection of lowest flow velocity in the 150 μm vessel

From: Very different performance of the power Doppler modalities of several ultrasound machines ascertained by a microvessel flow phantom

Machine Pulse repetition frequency/velocity range Wall filter Doppler frequency
A 1.3 cm/second Level 1 8 MHz
B 125 Hz Level 1 10 MHz
C 150 Hz 15 Hz R1a
Db 200 Hz Level 1 10 MHz
Eb 1,000 Hz Low 12.5 MHz
  1. aActual frequency not displayed on this machine. bNo flow detected in this vessel.