SonoSite C1.9 PLUS, Руководство по обслуживанию

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Chapter 8: Performance Tests 67
8.4.2 Axial Measurement Accuracy
Note: Measurements must be performed while the image is frozen.
To test axial accuracy:
1. Acquire the image.
2.
Press Freeze .
3. Press Measure . Two calipers appear on the image display. A menu appears, on
which are listed two distance icons, an ellipse icon, a delete icon, and a calcs
icon, if applicable. (If the caliper line setup is on, then a dotted line connects the
two calipers. See the SonoSite Ultrasound System User Guide , if necessary.) The
first caliper in the menu is active by default.
4.
Use the trackball to position one of the calipers.
5. Press Select to fix the caliper and enable the other caliper.
6.
Use the trackball to move the other caliper. The results update as you move the
caliper, and the measurement is complete when you finish moving the calipers.
(Press
Select to alternate the active caliper, and adjust the measurement with the
trackball .)
7.
To perform another distance measurement on the image, select the other
distance icon and repeat the preceding steps.
8.
Measure the distance, center to center, of two pins that are 5-12 cm apart
vertically.
9.
Verify that the distance measured is within the tolerance listed in Table 8.1.
8.4.3 Lateral Measurement Accuracy
To test the lateral measurement accuracy:
1. Perform steps 1 through 7 in Section 8.4.2 .
2.
Measure the distance, center to center, of two pins that are 4-10 cm. apart
horizontally.
3.
Verify that the distance measured is within the tolerance listed in Table 8.1.
4.
Press Freeze to return the system to live 2D mode.
Table 8.1 System Measurement Accuracy
MEASUREMENTS TOLERANCE
Axial Distance +/- 2%
Lateral Distance +/- 2%