Table 9 CTDlvol and DLP values for Head and Chest CTs in 6 facilities
Facility | CTDIvol mGy | DLP mGy.cm | |||||||
|---|---|---|---|---|---|---|---|---|---|
1st quartile | 2nd quartile | 3rd quartile | 75th/25th percentile | 1st quartile | 2nd quartile | 3rd quartile | 75th/25th percentile | Effective dose | |
Head (n = 163) | |||||||||
A | 32.88 | 35.31 | 38.53 | 1.17 | 636 | 673.5 | 871 | 1.37 | 1.6 (0.4) |
B | 39.25 | 42.04 | 48.245 | 1.23 | 800 | 1040 | 1232 | 1.54 | 2.1 (0.5) |
C | 51.92 | 51.92 | 51.92 | 1.00 | 1242 | 1291 | 1320 | 1.06 | 2.7 (0.2) |
D | 47.04 | 47.04 | 47.04 | 1.00 | 758 | 828 | 898 | 1.18 | 1.8 (0.2) |
E | 45.35 | 48.07 | 54.11 | 1.19 | 775 | 891.5 | 1042 | 1.34 | 1.9 (0.4) |
F | 57.38 | 57.38 | 57.38 | 1.00 | 1093.71 | 1168.31 | 1317.5 | 1.20 | 2.5 (0.3) |
75th percentile (NDRL) | 56.02 | 1260.33 | 2.1 (0.5) | ||||||
Chest (n = 139) | |||||||||
A | 6.25 | 8.01 | 10.76 | 1.72 | 239.95 | 298.09 | 469 | 1.95 | 4.1 (3.4, 6.6)** |
B | 5.36 | 6.23 | 8.38 | 1.56 | 182 | 246.5 | 399 | 2.19 | 3.5 (2.5, 5.6)** |
C | 4.49 | 7.23 | 11.46 | 2.55 | 289 | 356 | 721 | 2.49 | 5.0 (4.0, 10.1)** |
D | 5.76 | 6.98 | 8.92 | 1.55 | 172 | 218 | 278 | 1.62 | 3.1 (1.0) |
E | 3.97 | 5.05 | 5.69 | 1.43 | 293.5 | 384 | 408.5 | 1.39 | 5.2 (1.2) |
F | 5.11 | 6.95 | 9.51 | 1.86 | 158.79 | 213.9 | 309.17 | 1.95 | 3.8 (2.6) |
75th percentile (NDRLs) | 7.82 | 377 | 4.7 (2.8) | ||||||