Mindray DC-25, Service Manual

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5-12 Function Checking and Testing
5.5.2 Test Content
NOTE:
The image used here is only for reference, stick to the image effect in the
real situation.
Requirements:
1. Display: set the contrast and brightness at the clinical application value (or the
default status)
2. Operation environment: dark room, simulating the clinical application environment.
3. Scanning techniques: contact the probe with the acoustic window of the phantom, no
spacing nor pressing.
Tips:
1. For the testing phantoms, please refer to Appendix B.
KS107BD is low frequency phantom and used when Probe focus frequency is less
than 4MHZ;
KS107BD is low frequency phantom and used when Probe focus frequency is more
than 5MHZ;
2. For the testing standards, please refer to Appendix C Requirements of Performance
Indices.
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. Adjust the focus point focuses at 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.