5-16 Checking Performance and Functions
5.5.2.4 Blind Area
Test Procedure:
1. Place the probe gently on the phantom surface which is covered by water or gel.
2. Adjust the depth to lower value and set the focus to shallowest.
3. Reduce AP, Gain, etc until the background noise is barely visible.
4. Observe the depth of shallowest target image. It is also the blind area value.
Note:
1.
For linear probe, the probe surface should be perfectly fit with the acoustic
window on the phantom without any inclination during scan.
For convex probe, blind area target in the observation must lie on the central
line of the scan plane.
Image effect is show in figure below:
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