Mindray DC-25, Service Manual

Page: 83 / 213

Function Checking and Testing 5-13

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.
5. Repeat the operation above for the longitudinal resolution testing targets at other
depths.