5-14 Function Checking and Testing
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.
5. Record the depth of the furthest target (the target can be seen clearly).
Increasing the gain will also increase the noise, and echo may be
covered.
When using a linear probe, please completely contact the probe with the
scan surface, no side clearance is allowed.
When using a convex or phased-array probe, make the axis targets to be
displayed at the middle of the scanning image.
When system is not frozen, the fast field target information may be similar
to that of the noise, do not use this target.
As shown in figure below.
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