Table 5.
Volume CT dose indices (CTDIvol) and tube voltages at different phantom’s vertical positions in routine chest CT protocols without contrast administration using a fixed 120 kVp tube voltage.
| Patient vertical position (cm) | AP scout (Siemens) |
AP scout (GE) |
PA scout (Siemens) |
PA scout (GE) |
LAT scout (Siemens) |
LAT scout (GE) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CTDI (mGy) | Tube voltage (kVp) | CTDI (mGy) | Tube voltage (kVp) | CTDI (mGy) | Tube voltage (kVp) | CTDI (mGy) | Tube voltage (kVp) | CTDI (mGy) | Tube voltage (kVp) | CTDI (mGy) | Tube voltage (kVp) | |
| +6 | 4.22 | 120 | 3.70 | 120 | 3.83 | 120 | 1.99 | 120 | 2.62 | 120 | 2.96 | 120 |
| +3 | 3.89 | 120 | 3.06 | 120 | 4.22 | 120 | 2.29 | 120 | 2.56 | 120 | 2.98 | 120 |
| 0 | 3.58 | 120 | 2.57 | 120 | 4.62 | 120 | 2.68 | 120 | 2.48 | 120 | 3.00 | 120 |
| −3 | 3.27 | 120 | 2.21 | 120 | 4.79 | 120 | 3.33 | 120 | 2.51 | 120 | 2.91 | 120 |
| −6 | 2.98 | 120 | 1.93 | 120 | 5.24 | 120 | 4.03 | 120 | 2.53 | 120 | 2.82 | 120 |
CTDI = Computed tomography dose index, AP = Anterior-to-posterior, PA = Posterior-to-anterior, LAT = Lateral.