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Chapter 7 - System Operation
Optimizing TVD Doppler Mode
Preset generally gives optimal performance with minimum adjustment. If
necessary, the following controls can be adjusted to further optimize the
TVD mode display:
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In TVD mode, user can start PW/CW mode by pressing PW/CW key.
Select Gain to set the gain in the spectral Doppler area.
Select LVRej to reduce unwanted low velocity blood flow and tissue
movement.
Select Sample vol. to low setting for better resolution, or higher setting
to more easily locate the disturbed flows.
Select Freq. to optimize flow display. Higher setting will improve reso-
lution and the lower setting will increase the depth penetration.
Select Power to obtain an acceptable image while using the lowest set-
ting possible. The Doppler Power setting affects only Doppler operat-
ing modes.
Use all noise reduction controls with care. Excessive application may
CAUTION
obscure low level diagnostic information.
Use the Sweep to optimize the sweep speed.
Use Invert to reverse the vertical component of the spectral Doppler
area of the display.
Use Angle to steer the ultrasound beam to the blood flow to be mea-
sured.
Portable Ultrasound Diagnostic Scanner User Manual
Imaging Mode
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