Revision:1.0(2023–5–17)
50
44..44..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 targets must be displayed at a time.
• The measurement caliper should be placed above or under the center of the target to
be measured.
Test procedure:
1.
Place the probe gently on the acoustic window of phantom covered by water or ultrasonic gel.
2. Adjust the display depth to make horizontal targets display in the image.
3. Move the focus to 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 distances between horizontal targets by a step of 20
mm.
6. Select the measured value deviating the most from 20 mm, and calculate the error using the
following formula:
The image effect is shown in the following figure.
Diagnostic Ultrasound System
Service Manual
4 Function and Performance
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