Revision:1.0(2023–5–17)
48
44..44..22..33 Maximum Detection Depth
• An overlarge gain may result in large noise and submergence of the echo signal.
• For the linear probe, the probe surface must fit with the acoustic window of the
phantom without any inclination during scanning.
• For the convex or phased probe, the vertical targets must be placed in the center of
the scanning plane to ensure fairness of the interfering effect.
• In non-freeze mode, a distant target may be similar to a noise dot which should be
discarded.
Test procedure:
1.
Place the probe gently on the phantom surface covered by water or ultrasonic gel.
2. Set the display depth ( based on the maximum detection depth of the current probe).
3. Adjust the focus to the deepest and set the AP value to the largest.
4. Increase the gain, contrast, and TGC, but ensure that no halos or defocusing appears.
5. Read the depth of the most distant target line which is imaged clearly.
The image effect is shown in the following figures.
Diagnostic Ultrasound System
Service Manual
4 Function and Performance
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