Gammex 403 LE, User Manual

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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 
horizontal pins have 3 cm 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.

Measure pin width 
to get lateral 
resolution.

Pin targets are 
narrowest in the 
focal zone.