Table 5.
Performance of 4 acquisitions in average Hounsfield Unit (HU) values derived from HU module.
| Material | CW: 5°–220° (No. 1) | CCW: 85°–230° (No. 1) | CW: 275°–130° (No. 2) | CCW: 355°–140° (No. 2) | Expected range |
|---|---|---|---|---|---|
| Air | −948.5 | −946.8 | −867.4 | −902.0 | −1046 to −986 |
| PMP | −289.1 | −299.4 | −231.8 | −239.5 | −220 to −172 |
| LDPE | −254.1 | −204.2 | −163.9 | −162.3 | −121 to −87 |
| Polystyrene | −220.4 | −165.1 | −120.9 | −114.3 | −65 to −29 |
| Acrylic | −73.8 | −49.6 | 17.3 | 21.8 | 92 to 137 |
| Delrin | 145.0 | 110.8 | 203.2 | 216.1 | 344 to 387 |
| Teflon | 659.7 | 589.1 | 675.8 | 710.7 | 941 to 1060 |
CW, clock wise; CCW, counter clock wise.