GE LOGIQ 500 Advanced Reference Manual page 175

Axial distance measurements
Description
Benefit
Method
Procedure
.
LOGIQ 500 Advanced Reference Manual
2276614–100 Rev. 0
Axial measurements are the distance measurements obtained
along the sound beam. Refer to Figure 5–1 on 5–5 for details.
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 1.5% of the actual distance.
Quality Assurance
5–9