GE LOGIQ 7, Basic User Manual

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Optimizing the Image
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74 LOGIQ 7 Online Help
Direction 2392536-100 Rev. 1
Gain
Description Gain amplifies the overall strength of echoes processed in the
Color Flow window or spectral Doppler timeline.
Adjusting Gain values change depending on the probe and application;
they are not associated with a particular position of the button.
To decrease/increase Gain, adjust the dial to the left/right.
Values Values vary by probe, application, and multi frequency setting.
Gain displays as dB. Gain values are returned to the factory or
user preset value when you change the following: Probe, Exam
Category, Exam Calcs, New Patient, or Multi Frequency.
Benefits Allows you to control the amount of color within a vessel or to fill
in or clean out spectral information.
Bioeffects Gain has no affect on Power Output. However, with increased
Gain, the output level can usually be reduced to produce an
equivalent image quality.
PRF (Pulse Repetition Frequency)
Description Raises/lowers the PRF on the color bar.
Adjusting To raise/lower the velocity scale, press PRF/Wall Filter until you
reach PRF, then adjust PRF left/right.
Values Velocity range is in kHz.
PRF values are returned to the factory or user preset value
when you change the following: Probe, Exam Category, Exam
Calcs, or New Patient.
Benefits Imaging of higher velocity flow requires increased scale values
to avoid aliasing.
Affect on other
controls Changing the PRF may affect Power Output, frame rate, and
wall filter. When you adjust the velocity scale, CINE memory is
cleared.
Bioeffects Changing the PRF range may change the TI and/or MI. Observe
the output display for possible effects.