10
9. 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. Notice how noise
in the anechoic target becomes apparent as the gain increases. If your system has image
“post-processing” capabilities, observe how the contrast between targets changes with
different settings.
Adjust the gain control to the lowest noise level. This is the point at which you eliminate
noise in the anechoic cyst (lower the gain until it just disappears). Record this gain setting
and use it for future grey scale measurements. Freeze the image and visually evaluate
the grey scale targets. Match each target with a step on the grey bar in the image. Make a
hard copy and compare the hard copy with the image on the scanner.
10. When you are done scanning the phantom, empty the water dam or completely clean off
the coupling gel with a soft cloth or paper towel.
Target Specifications
Low Scatter (Anechoic) Cysts
Diameters......................................................................................................................2, 4 and 6 mm
Placement.......................................................................................................... 4, 9 and 14 cm deep
Pin Targets
Diameter................................................................................................................................0.1 mm
Vertical spacing...........................................................................................20 mm at 3-17 cm deep
Horizontal spacing................................................................................30 mm at 3 and 13 cm deep
Resolution Target Groups
...............................................................................................................4, 9 and 14 cm deep
All acoustic measurements made at 4.5 MHz, 22ºC.
Due to our philosophy of continuous quality improvement,
all specifications are subject to change.
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