Table 3.
Nominal BMD values specified by the manufacturers and mean values ± standard deviation measured on the two CT scanners for each anatomical region in the ASPs. Intra-scanner precision values (standard deviation of repeat measurements reported in terms of mg/cm3) are listed for repeat measurements obtained on scanner B[CD2].
| BMD (mg/cm3) | |||||
|---|---|---|---|---|---|
| Phantom | Region | Nominal | Scanner A | Scanner B | Intra-Scanner Precision |
| EHP | Soft tissue | 0 | 15.0 ± 7.5 | 1.2 ± 2.9 | 0.38 |
| Cortical bone | 800 | 870.3 ± 21.6 | 802.6 ± 52.0 | 0.03 | |
| Soft tissue | 0 | 0.3 ± 1.9 | −4.0 ± 0.8 | 0.14 | |
| Trabecular bone | 100 | 109.6 ± 11.5 | 99.8 ± 13.7 | 0.72 | |
| ESP | Vertebral arch | 800 | 766.5 ± 21.2 | 747.8 ± 10.1 | 5.49 |
| Transverse processes | 400 | 383.4 ± 16.5 | 381.3 ± 8.8 | 3.83 | |
| IATP | Soft tissue | 0 | −1.7 ± 0.9 | −2.3 ± 1.4 | 0.04 |
| Trabecular bone | 100 | 99.5 ± 16.3 | 93.6 ± 16.2 | 0.22 | |
| QRM | Cortical bone | 816 | 830.1 ± 26.8 | 790.6 ± 69.1 | 0.67 |
| Trabecular bone | 102 | 122.8 ± 7.8 | 107.4 ± 6.8 | 1.27 | |
| QRM1 | Cortical bone | 816 | 808.7 ± 38.7 | 787.5 ± 80.3 | 4.65 |
| Trabecular bone | 102 | 126.5 ± 11.4 | 108.2 ± 6.6 | 1.08 | |
| QRM2 | Cortical bone | 816 | 797.6 ± 37.9 | 761.9 ± 80.0 | 2.09 |
| Trabecular bone | 102 | 118.5 ± 11.8 | 114.0 ± 12.7 | 2.32 | |