GE LOGIQ 7, Basic User Manual

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Optimizing the Image
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98 LOGIQ 7 Online Help
Direction 2392536-100 Rev. 1
Doppler sample volume gate position (Trackball)
Description Moves the sample volume gate on the B-Mode's Doppler Mode
cursor. The gate is positioned over a specific position within the
vessel.
Adjusting To move Doppler Mode cursor position, move Trackball left or
right until positioned over the vessel.
To move sample volume gate position, move Trackball up or
down until positioned inside the vessel.
Values Defaults to 50% of the depth and can move continuously
throughout the field of view.
Benefits Positions the sample volume gate to sample blood flow.
Bioeffects Changing the sample volume gate position may change the TI
and/or MI. Observe the output display for possible effects.
Doppler sample volume length
Description Sizes the sample volume gate.
Adjusting To increase/decrease the gate size, adjust SV Length on the
Touch Panel. Hold down key to continuously size gate. A black
bar appears indicating changes made to the sample volume
size, but this is not a time discontinuity.
NOTE: Adjustments to the sample volume gate size are made from the
center point of the sample volume position.
Values Values vary by probe and application.
Sample volume gate size values are returned to the factory or
user preset value when you change the following: Probe, Exam
Category, Exam Calcs, or New Patient.
Benefits A smaller gate produces accurate sampling results because it is
more sensitive. You can also enlarge the gate to hear the
Doppler audio better or for sampling large vessels or areas.
Bioeffects Changing the sample volume gate size may change the TI and/
or MI. Observe the output display for possible effects.