Gammex Phantom 404 LE Podręcznik użytkownika - Strona 8
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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 5 mm spacing while the
horizontal pins have 10 mm spacing.
Use the 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 vertical pin targets. Use the electronic calipers to
measure the horizontal width of the pin targets in the near, mid and far fields of
the image.
Notice how the pin targets are narrowest in the focal zone. The pin width
demonstrates the width of the ultrasound beam at that depth and approximates
the lateral resolution of the scanner.
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