GE LOGIQ F Series, Базовое руководство по обслуживанию

Страница: 94 / 167

GE LOGIQ F S
ERIES
D
IRECTION
5446617-100, R
EVISION
10 B
ASIC
S
ERVICE
M
ANUAL
4 - 18 Section 4-3 - General Procedure
4-3-8-2 Doppler Mode Controls
Table 4-4 Doppler Mode Controls
Control Possible Bioeffect Description/Benefit
Auto Spectral
Optimize [ASO]
(Auto) Yes Auto in Doppler Mode optimizes the spectral data. Auto
adjusts the Velocity Scale/PRF (on live images only),
baseline shift, Dynamic Range and invert (if preset).
The benefit of Auto can be found in reduced
optimization time and a more consistent and accurate
optimization process.
Update Yes Toggles between simultaneous and update
presentation while viewing the timeline.
Doppler sample
volume gate position
(Trackball) Yes Moves the sample volume gate on the B-Mode's
Doppler Mode cursor. The gate is positioned over a
specific position within the vessel.
Doppler sample
volume length Yes Sizes the sample volume gate.
Scale (Velocity
Scale) Yes Adjusts the velocity scale to accommodate faster/
slower blood flow velocities. Velocity scale determines
pulse repetition frequency.
If the sample volume gate range exceeds single gate
Scale capability, the system automatically switches to
high PRF mode. Multiple gates appear, and HPRF is
indicated on the display.
Angle Correct No Estimates the flow velocity in a direction at an angle to
the Doppler vector by computing the angle between the
Doppler vector and the flow to be measured.
NOTE: When the Doppler Mode Cursor and angle
correct indicator are aligned (the angle is O), you
cannot see the angle correct indicator.
Quick Angle No Quickly adjusts the angle by 60 degrees.
Wall Filter No Insulates the Doppler signal from excessive noise
caused from vessel movement.
Baseline No Adjusts the baseline to accommodate faster or slower
blood flows to eliminate aliasing.
Mode Cursor No Displays the Doppler Mode cursor on the B-Mode
image.
Steer and Fine Steer Yes You can slant the ROI of the Color Flow linear image
left or right to get more information without moving the
probe. The angle steer function only applies to linear
probes.
Volume No Controls audio output.
Invert No Vertically inverts the spectral trace without affecting the
baseline position.
Compression No Dynamic range controls how echo intensities are
converted to shades of gray, thereby increasing the
range of contrast you can adjust.
Trace Method No Traces the average mean and peak velocities in
realtime or frozen images.
Cycles to Average No The average value over a number of cycles (from 1-5).
Trace Sensitivity No Adjust the trace to follow the waveform for signal
strength.
Trace Direction No Specifies trace direction.