5-12 Function and Performance Checking Method
5.5.2.1 Resolution
transverse resolution
Test Step:
1. Cover the scan surface of the phantom with water or couple gel, gently contact the probe with
the scan surface, making the transverse resolution testing targets to be displayed around the
midline of the image.
2. Scan the position where the transverse 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. In condition that the transverse resolution testing targets are horizontally displayed, record the
minimal distance of two targets that can be clearly recognized.
5. Repeat the operation above for the transverse resolution testing targets at other depths.
As shown in figure below.
Axial resolution
Test Step:
1. Cover the scan surface of the phantom with water or couple gel, gently contact the probe with
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.
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