User Maintenance
6-26 Venue 50 – Basic User Manual
Direction 5446729-100 English
Rev. 7
Axial distance measurements
Description
Axial measurements are the distance measurements obtained
along the sound beam. See Figure 6-1 for more information.
Benefit
The accurate measurement 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.
Method
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.
Procedure
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 5% of the actual distance.
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