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Doppler
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
5–53
High PRF
High Pulse Repetition Frequency (HPRF) is a special operating
mode of PW Doppler. In conventional mode, a single energy
pulse is used to obtain signals for each line in the PW
spectrum. In HPRF mode, multiple energy pulses are used.
This allows higher velocities to be detected without aliasing
artifacts. HPRF mode is used when detected velocities exceed
the processing capabilities of the currently selected PW Doppler
scale or when the selected anatomical site is too deep for the
selected PW Doppler scale.
HPRF is enabled when operating in PW Doppler Mode and the
velocity scale is increased beyond a set value. The selection
on page 3 of the Doppler Sub-Menu can be used to override
this automatic switching to HPRF mode.
When HPRF is active, 3 sample volume gates appear along the
Doppler Mode cursor. Doppler information can be received
from any of the 3 sample volume gates. The Doppler signals
from all 3 gates are added together and displayed in
1 spectrum.
NOTE: Ensure that only 1 gate overlays a blood vessel at a
time. Otherwise, signals from more than 1 flow area are
superimposed.
Refer to
5–69
on how to enable/disable the HPRF function.
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