4-7
QA Tests
032-0330-EN Rev K
11. Record the Mean HU value of each material. See table below. Recorded values should fall within
the lower and upper limits.
12. When finished, save the file and close TxSTUDIO.
QA Air Water Test
Set Up QA Air Water Phantom
NOTE: It is important to use the water phantom provided with the scanner. Use distilled water in the
phantom. Using tap water may negatively affect the test results.
1. Remove chin cup and insert phantom platform at lowest position.
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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