5-16 Function Checking and Testing
The measurement caliper should be positioned at the upper edge of
the target, not the middle nor the lower edge.
The scanning plane should be vertical to the target line, that means
the scanning plane is parallel with the cross-section of the phantom
As shown in figure below.
Transverse geometric positioning accuracy
Test Step:
1. Cover the scan surface of the phantom with water or couple gel, gently contact the
probe with the scan surface
2. Adjust the depth, making the transverse targets to be displayed in the image.
3. Adjust the focus point to be posited beside the transverse targets (the standard is
not clear)
4. Adjust parameters like gain, TGC, making each transverse targets to be clearly
displayed.
5. Record the distance by 20mm each segment on the transverse targets line by using
the measurement caliper
6. Select the value with the greatest error (to 20mm), calculate the accuracy by using
the formula below
When using a linear probe, record the transverse distance by
segment.
When using a convex probe, all transverse targets should be
displayed integrally in an image.
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