Table 4.
Volume CT dose indices (CTDIvol) and tube voltages at different phantom’s vertical positions in routine chest CT protocols without contrast administration using ATVS. The tube voltages changed compared to the reference table height are bolded.
| 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 | 4.42 | 120 | 3.72 | 120 | 3.48 | 100 | 2.00 | 120 | 2.61 | 100 | 2.99 | 120 |
| +3 | 4.03 | 120 | 3.04 | 120 | 3.72 | 100 | 2.30 | 120 | 2.56 | 100 | 2.98 | 120 |
| 0 | 3.21 | 100 | 2.58 | 120 | 4.67 | 120 | 2.69 | 120 | 2.42 | 100 | 2.96 | 120 |
| −3 | 2.85 | 100 | 2.21 | 120 | 4.87 | 120 | 3.33 | 120 | 2.33 | 100 | 2.91 | 120 |
| −6 | 2.68 | 100 | 1.93 | 120 | 5.41 | 120 | 4.00 | 120 | 2.37 | 100 | 2.82 | 120 |
CTDI = Computed tomography dose index, AP = Anterior-to-posterior, PA = Posterior-to-anterior, LAT = Lateral.