GE LOGIQ 500 Advanced Reference Manual page 176

Quality Assurance
Lateral distance measurements
Description
Benefit
Method
Procedure
.
5–10
Lateral measurements are distance measurements obtained
perpendicular to the axis of the sound beam. Refer to
Figure 5–1 on 5–5 for details.
The purpose is the same as vertical measurements.
Precisely-spaced horizontal pin targets are scanned and results
compared to the known distance in the phantom.
Lateral distance should be measured in the near, mid and far
fields as well as in zoom. If necessary, different depths of fields
of view can be tested.
To measure lateral distance:
1. Scan a test phantom with precisely-spaced horizontal
pin targets. Adjust all scan controls, as necessary, for
the best image of the pin targets from side to side.
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 horizontal 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 horizontal measurements differ by
more than 3mm or 3% of that depth, whichever is greater.
LOGIQ 500 Advanced Reference Manual
2276614–100 Rev. 0