Table 1:
Patient characteristics and radiation dose in CT protocols with standard and low tube currents
| Subject Characteristic | Group A (Tube Current = 100 mAs) | Group B (Tube Current = 80 mAs) | P Value |
|---|---|---|---|
| Age | 74.9 | 74.2 | .48 |
| Sex (M/F) | 14/6 | 14/6 | 1 |
| Tmax (second) | 12.5 + 2.34 | 12.3 + 2.83. | .53 |
| Maximium HU of A2a | 159.84 | 177.6 | .13 |
| CTDI (mGy) | 153.56 + 0.03 | 128.17 + 0.03 | <.001 |
| DLP (mGy/cm) | 1229 + 0.26 | 985 + 0.6 | <.001 |
| Effective dose (mSv) | 2.56 mSv | 2.06 mSv | <.001 |
Note:— Tmax indicates the time point of maximal enhancement of anterior cerebral artery; DLP, dose-length product.
a
A2 indicates second portion of anterior cerebral artery.