GE Medical Systems 500, Руководство пользователя, Страница: 125 / 636

B–Mode
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
5–13
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Controls (cont’d)
Scan Area Size
Scan Area Position
Description Widen or narrow the size of the sector to
maximize the image’s field of view for
convex and sector probes. Adjusts color
window for linear probes. The reduced sector angle can be steered
to get more information without moving the
probe. Colored markers around the image
act as guides while steering the reduced
sector angle.
Accessing/
Changing
To narrow the angle:
Press Scan Area.
Move the Trackball toward the left.
To widen the angle:
Press Scan Area (if not already
activated).
Move the Trackball toward the right.
NOTE: Pressing Scan Area toggles
between size and steering control.
To assign trackball control to the scan area
position mode and steer the angle:
Press Scan Area (adjust scan area
size).
Press Scan Area again.
Move the Trackball to the right or left.
Benefits Increase the sector width to see a wide
anatomical structure, decrease the sector
width to have a faster frame rate. Allows the movement of a reduced sector
angle laterally. Beneficial in GYN.
Values Sector/Convex Probe: Range from 10
°
to
full “B” width.
Linear Probe: Range from 10mm to full
“B” width.
Continuous steer within the full maximum
probe width.
Affects on
Other Controls Increasing sector size decreases the
frame rate; decreasing sector size
increases the frame rate. In scan area position mode, press Scan
Area to return trackball control to the scan
area sizing mode.
Bioeffects
Acoustic
As the sector width narrows, the TI tends
to increase since the target is being hit
more often and the MI may decrease since
the peak power is reduced.
Acoustic
Output
Hazard
Observe the output display for possible
effects.