User Guide
8
4. Align the probe so that all the vertical targets are displayed at their maximum
intensity level.
5. Freeze the image and obtain a hard copy.
6. Using electronic calipers, measure the distances between two wires at various
depths or align the echoes to the display markers for comparison.
7. Record these measurements.
8. Compare the measured values with the recorded baseline distances.
HORIZONTAL DISTANCE MEASUREMENTS
The horizontal target group is used to determine the accuracy of measurements
made perpendicular to the beam axis. There are two horizontal plane target groups.
The 4 cm deep group contains 4 wires with spacing of 10 mm and 20 mm. The
9 cm deep group has 20 mm spacing between each of the 7 wires. Refer to the
target diagram attached to your phantom. Testing is performed as follows:
1. Fill the water trough with tap water.
2. Position the transducer in a vertical plane. (The wires should appear as dots,
not lines).
3. Adjust the instrument settings (gain, TGC, output, etc.) as for a “normal”
technique. Record these settings for use on subsequent testing.
4. Align the probe so that all the horizontal targets are displayed at their maximum
intensity level.
5. Freeze the image and obtain a hard copy.
6. Using electronic calipers, measure the distances between two wires along the
horizontal plane.
7. Record these measurements.
8. Compare the measured values with the known distances between the targets.
AXIAL AND LATERAL RESOLUTION TESTING
Axial resolution is dened as the ability of an ultrasound system to resolve objects in
close proximity along the axis of the beam. In other words, it determines how close
two objects can be along the axis of the beam and still be detected as two distinct
objects. Axial resolution is proportional to the length of the system’s transmitted
ultrasonic pulse or pulse length.
Lateral resolution is similar to axial resolution except it is concerned with the resolu-
tion perpendicular to the beam axis. Lateral resolution will improve with a narrowing
of the beam width. Therefore, within the focal zone, the lateral resolution will be at
its best.