10
Pin targets are resovled axially if an imaginary horizontal line can be drawn
between the targets without touching either target. The targets on the left are not
resolved. The targets on the right are resolved.
Examine the other resolution target groups and compare the resolution at various
depths. Axial resolution may change with depth.
8.
Scan the nearest cystic target group. Each target should be round with a clean
black appearance and well defined edges. Bright specular echoes at the top and
bottom of the targets are normal.
Measure the dimensions of the 4 mm cystic target to check the image geometry.
Use the calipers to measure from top to bottom and side to side. Repeat with the
other cystic target groups as part of the cyst imaging test.
9.
Decrease image depth to the minimum and examine the dead zone target group.
The dead zone targets can be used to measure lateral resolution in the extreme
near field of the transducer.
Note
: The highest dead zone pin you can see should be the point of
reference for all measurements – not the scanning surface.
10.
Scan the four grey scale targets and observe the difference in their grey levels.
Adjust the gain control and observe how this affects the brightness of the targets.
Unresolved
Resolved
Summary of Contents for 404GS LE
Page 1: ...404GS LE Precision Small Parts Grey Scale Phantom Gammex User s Guide...
Page 13: ...13...
Page 24: ...24 Notes...
