Table 5 The measured CT number accuracy of different material in quality assurance phantom axial brain protocol at 120kv and 500mAs
Material | Actual (HU) | Measured CT number (HU) | SD (HU) | Result |
|---|---|---|---|---|
Air | − 1000 | − 66.7 | 3.5 | Pass |
Bone | 900 | 936 | 7.3 | Pass |
Water | 0 | 3.2 | 4 | Pass |
Acrylic | 120 | 138 | 3.7 | Pass |
Polyethylene | − 95 | 108 | 3.7 | Pass |