Document Classification

Section Type: RESULTS

Text: Mean estimated radiation dose was significantly lower (high-pitch spiral vs sequential scanning) in group A (for 100 kV, 0. 81 mSv 0. 30 vs 2. 74 mSv 1. 14 [P <. 001] ; for 120 kV, 1. 65 mSv 0. 69 vs 4. 21 mSv 1. 20 [P <. 001]) and in group B (sequential vs retrospective spiral scanning) (for 100 kV, 4. 07 mSv 1. 07 vs 5. 54 mSv 1. 76 [P =. 02] ; for 120 kV, 7. 50 mSv 1. 79 vs 9. 83 mSv 3. 49 [P =. 1]).