Cirs ATS539 - Elevational Testing

10
AXIAL AND LATERAL RESOLUTION TESTING
Results:
The system's ability to resolve the array targets at all four depths should remain
consistent from week to week when using the same instrument settings and the
Model ATS539 phantom. Compare the test results obtained with a baseline or
previous test. If the current image demonstrates changes in the system's ability to
resolve these targets, corrective action should be considered.
ELEVATIONAL TESTING
A full characterization of system resolution requires measurement of elevational res-
olution, or slice thickness. Slice thickness is typically much coarser than axial and
lateral resolution as most ultrasound transducer arrays are mechanically focused in
the thickness dimensions.
Two methods are described for measuring elevational resolution. The rst method,
rst described by Skolnick
(1)
, uses the vertical wire targets as follows:
1. Apply coupling gel to the scanning surface or ll the water trough with tap
water.