17-19 Operators’ Manual
990400 Rev C 2010 May 1
12-8
c. Move the position of the slice to the middle of the phantom
as shown in the figure.
32. Right click the image and select HU Statistics from the menu
(also, right click to turn off HU Statistics).
33. Area of ROIs should be at least 40mm
2
but less than 46mm
2
.
Use the Region Tool to define a ROI in the center of each circle
of material implanted within the QA phantom.
34. Record the Hounsfield value of each material. See table below.
35. Call Service, if any of the four measured values exceed the
Lower or Higher limit.
Material
Mean Scan Value
(Hounsfield Units)
Lower
Limit
Upper
Limit
Mean
Air (Black) (lower left) -1000 -980 -990
Acrylic (Light Gray) (lower right) -50 200 75
LDPE (Dark Gray) (upper right) -250 -50 -150
Teflon (White) (upper left) 580 1160 870
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