User Guide

9
AXIAL AND LATERAL RESOLUTION TESTING (CONTINUED)
The Model 040GSE has three combined axial and lateral resolution target groups.
The rst two groups, at depths of 3 cm and 6.5 cm, are designed for probes of 5
MHz and above. They consist of 13 parallel nylon wires of 80 microns diameter. The
third target is located at 10.5 cm depth for evaluation of low frequency probes. It
consists of 11 parallel nylon wires of 80 microns diameter.
To measure axial and lateral resolution, refer to Figures 2 and 3 for the layout of the
axial/lateral target groups and perform the following steps:
1. Apply coupling gel to the scanning surface or ll the water trough with tap
water.
2. Position the transducer above the axial resolution targets 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 targets are displayed at their maximum intensity
level.
5. Freeze the image and obtain a hard copy.
6. Examine the image to determine the last pair of wires to be distinguished as
two separate entities. If the last pair of wires to be resolved is separated by
a distance of 1 mm then record the axial resolution as being “in between
0.5 mm and 1.0 mm”.
Targets
A1-B1 A2-B2 A3-B3 A4-B-4 A5-B5 A6-B6
Axial
Resolution (mm)
0.25 0.5 1.0 2.0 3.0 4.0
Targets
A1-A2 A2-A3 A3-A4 A4-A5 A5-A6 A6-A7
Lateral
Resolution (mm)
4.00 3.0 2.0 1.0 0.5 0.25
Axial Resolution
Lateral Resolution
A7 A6 A5 A4 A3
B6
B5
B4
B3
B2
A2
B1
A1
Edge to
adjacent Edge
2.00 mm
Edge to
adjacent Edge
1.00 mm
Figure 2 - Combined Axial/Lateral Resolution Targets at 3 and 6.5 cm depth(top) and a table listing distances
between them (bottom)