Function and Performance Checking Method 5-13
the scan surface, making the longitudinal resolution testing targets to be displayed around the
midline of the image.
2. Adjust the focus point focuses at the position where the longitudinal resolution testing targets
are displayed.
3. Adjust parameters like gain, dynamic range, TGC, making the background tissue unseen, just
displaying the target image clearly.
4. Record the minimal distance of two longitudinal resolution testing targets that can be clearly
recognized.
5. Repeat the operation above for the longitudinal resolution testing targets at other depths.
When using the convex probe, keep the transverse resolution testing targets to
be displayed near the midline.
When using a linear probe with steer function, do not turn on the steer function
when perform the transverse resolution test.
Zoom in the region where the targets located if necessary.
The diameter of the target point at a certain depth is equal to the transverse
resolution at the depth.
5.5.2.2 Maximum Depth
Test Step:
1. Cover the scan surface of the phantom with water or couple gel, gently contact the probe with
the scan surface
2. Set the system display depth according to the expected maximum available depth of the probe
in use.
3. Adjust the focus point to the deepest, and AP at the maximum value.
4. Set gain, contrast, TGC at a greater value, but no halation nor defocus is allowed.
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