GE LOGIQ 7 Basic User Manual page 960

User Maintenance
Axial distance measurements
Description
Benefit
Method
Procedure
18 32
-
Axial measurements are the distance measurements obtained
along the sound beam. See Figure 18-11 for more information.
The accurate measurement of the size, depth and volume of a
structure is a critical factor in determining a proper diagnosis.
Most imaging systems use depth markers and/or electronic
calipers for this purpose.
Axial distance should be measured in the near, mid and far fields
as well as in zoom. If necessary, different depths or fields of
view can be tested.
To measure axial distance:
1. Scan a test phantom with precisely-spaced vertical pin
targets. Adjust all scan controls, as necessary, for the best
image of the pin targets to typical depths for the probe being
used.
2. Press Freeze to stop image acquisition and perform a
standard distance measurement between the pins at
different points in the image. Record all images for
archiving.
3. Scan the vertical pins in zoom or at different depth/scale
factors.
4. Press Freeze to stop image acquisition; repeat the distance
measurements between pins and record the images for
archiving.
5. Document the measurements for reference and future
comparison.
Contact a Service Engineer if vertical measurements differ by
more than 1.50% of the actual distance.
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