SonoSite MicroMaxx, Руководство по обслуживанию

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70 Chapter 8: Performance Testing
Testing 2D Performance
2D Image Quality
Axial Measurement Accuracy
Note: Measurements must be performed while the image is frozen.
Test 2D
Performance 1 Use a C60e/5-2 MHz transducer in 2D mode.
2 Adjust the position of the C60e/5-2 MHz transducer on the phantom.
3 Use the 2D system controls to obtain a clear image that shows both the horizontal and
vertical rows of pins.
Test 2D Image
Quality 1 Verify that the ultrasound image appears uniform in both the axial and lateral direction,
with no dropouts or intensity variations.
2 Verify that the cystic structure at the focal zone is clearly differentiated from the
surrounding tissue and is echo-free, while solid tissue, with numerous echo sources,
appears solid.
Set up Axial
Accuracy 1 Acquire the image.
2 Press the Freeze key.
3 Press the Caliper key. The caliper appears on the image display. The screen menu indicates
Cal 1, Cal 2, and Ellipse. (If the caliper line setup is on, then a dotted line connects the two
calipers. See the
MicroMaxx Ultrasound System User Guide , if necessary.) The Cal 1 caliper is
active by default.
4 Use the touchpad to position one of the calipers.
5 Press the Select key to fix the caliper and enable the other caliper.
6 Use the touchpad 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 the
Select key to
alternate the active caliper, and adjust the measurement with the touchpad.)
7 To perform another distance measurement on the image, select the other distance icon and
repeat the preceding steps.
Test Axial
Accuracy 1 Measure the distance, center to center, of any two pins that are 5-12 cm apart vertically.
2 Verify that the distance measured is within the tolerance listed in Table 8.1 .