Table 3.
Mean (SD) effective dose for each type of CT study at each of the four sites
| Anatomic Area | Type of CT Study | Site 1 | Site 2 | Site 3 | Site 4 | P value | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | (SD) | Mean | (SD) | Mean | (SD) | Mean | (SD) | |||
| Head and Neck | Routine Head | 2.8 | (1.0) | 1.8 | (0.3) | 2.8 | (1.2) | 1.9 | (0.4) | p<.00001 |
| Routine Neck | 2.8 | (1.0) | 5.9 | (1.5) | 5.1 | (1.4) | 2.3 | (0.6) | p<.00001 | |
| Suspected Stroke | 18 | (13) | 15 | (3.3) | 7.6 | (2.0) | 29 | (8.0) | p<.00001 | |
| Chest | Routine Chest, no contras | 5.2 | (2.6) | 12 | (6.6) | 11 | (3.9) | 7.4 | (3.4) | p<.00001 |
| Routine Chest, with contrast | 6.6 | (5.4) | 11 | (4.8) | 11 | (4.0) | 7.9 | (3.8) | p<.00001 | |
| Suspected Pulmonary Embolism | 8.1 | (3.4) | 21 | (6.8) | 9.0 | (2.0) | 9.0 | (3.3) | p<.00001 | |
| Coronary Angiogram | 21.4 | (8.9) | 19.7 | (6.2) | p=.75 | |||||
| Abdomen and Pelvis | Routine Abdomen-Pelvis, no contrast | 12 | (7.0) | 19 | (7.4) | 20 | (7.2) | 12 | (5.2) | p<.00001 |
| Routine Abdomen-Pelvis, with contrast | 12 | (6.1) | 16 | (6.7) | 20 | (7.4) | 15 | (6.2) | p=.00027 | |
| Multiphase Abdomen-Pelvis | 24 | (13) | 35 | (8.0) | 45 | (14) | 34 | (17) | p= .00001 | |
| Suspected Aneurysm or Dissection | 49 | (14) | 25 | (18) | 22 | (8.0) | 25 | (10) | p<.00001 | |