Revision:1.0(2023-01-12)
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3. Select all measurement values deviating largely from 20mm, and calculate the error by the
following formula.
The image effect is shown in the figure below:
44..55..22..55 Lateral Geometric Positioning Accuracy
• For the linear probe, the lateral interval can be read section by section.
• For the convex probe, all lateral target points must be displayed at a time.
• The measurement caliper should be placed above or under the center of the target
point to be measured.
Test procedure:
1. Place the probe gently on the acoustic window of phantom which is covered by water or
ultrasonic gel.
2. Adjust the display depth to make horizontal targets display in the image.
3. Adjust the focus to be in horizontal targets (no explicit standard).
4. Adjust the gain, TGC, and other parameters to make each horizontal target display clearly.
5. Use a measurement caliper to measure horizontal target distance by step of 20 mm.
6. Select all measurement values deviating largely from 20mm, and calculate the error by the
following formula.
Diagnostic Ultrasound System
Service Manual
4 Function and Performance
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