Doppler Sample Volume Gate Position (Trackball); Doppler Sample Volume Length - GE LOGIQ 7 Basic User Manual

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Doppler sample volume gate position (Trackball)

Moves the sample volume gate on the B-Mode's Doppler Mode

cursor. The gate is positioned over a specific position within the

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.

Defaults to 50% of the depth and can move continuously

throughout the field of view.

Positions the sample volume gate to sample blood flow.

Changing the sample volume gate position may change the TI

and/or MI. Observe the output display for possible effects.

Sizes the sample volume gate.

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.

Adjustments to the sample volume gate size are made from the

center point of the sample volume position.

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.

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.

Changing the sample volume gate size may change the TI and/

or MI. Observe the output display for possible effects.

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