8
4.
Move the transducer across the scanning surface while observing the locations
of the targets.
Notice how the smooth texture of the tissue mimicking gel emphasizes image
non-uniformities and artifacts, making them easier to detect. Scanning an area
without targets is a good way to test for
image uniformity
.
Decrease gain controls to highlight pin targets.
5.
Scan the vertical pin targets and freeze the image. Use the electronic calipers to
measure the distance between two of the vertical pin targets. Repeat for two of
the horizontal pin targets. The vertical pins have 2 cm spacing while the horizon-
tal pins have 3 cm spacing.
Use these pin targets to determine
vertical distance accuracy
and
horizontal
distance
accuracy
. Note that the highest dead zone pin you can see should be
the point of reference not the scanning surface.
6.
Freeze an image of the resolution target group at 1 cm. Examine the horizontal
row of pins at the top of the target group. The pins that are closest together
without touching indicates the scanner’s lateral resolution.
Repeat this procedure with the other resolution target groups. Notice how lateral
resolution is narrowest in the focal zone. For a transducer whose focal zone is in
the area between the resolution targets, an alternate test can be performed.
Summary of Contents for 405 GSX LE
Page 1: ...User s Guide 405 GSX LE Precision Resolution Grey Scale Phantom ...
Page 13: ...13 ...
Page 25: ...25 Notes ...
