Checking Performance and Functions 5-13
1. Place the probe head gently on the acoustic window of the phantom which is covered by water
or gel, and make sure the axial resolution targets are displayed in the center of the image.
2. Focus to the axial resolution target group.
3. Adjust gain, dynamic range, TGC, etc., make sure only the target line is displayed clearly on
the image with no tissue image in the background.
4. Read the distance between two target points that can be separated clearly.
5. Repeat upper steps at other depth.
Note:
1.
For convex probe, keep the lateral resolution targets near the central line of the
2.
For linear probe with Steer function, DO NOT turn on Steer when testing the
3.
Magnify (zoom) the targets for observation if necessary.
Distance between the left and right edges of a target point at a certain depth
indicates the transverse resolution at this depth also.
5.5.2.2 Maximum Detection Depth
Test Procedure:
1. Place the probe gently on the phantom surface which is covered by water or gel.
2. Set displaying depth (according to the max depth of the current probe);
3. Adjust Focus to the deepest value, set AP value to largest.
4. Increase Gain, Contrast, TGC, but make sure no halos or defocusing appears.
5. Record the depth of the most distant target line which is imaged clearly.
Note:
1.
An overlarge gain may result in large noise and submergence of the echo
signal.
For linear probe, the probe surface should be perfectly fit with the acoustic
window on the phantom without any inclination during scan.
3.
For convex and phased probe, make sure the axial target group is placed in the
central of the scanning plane which keeps the justice of the interfering effect.
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