Table 3.
Scan parameters and dose estimates
Scan parameters and dose estimates | Total | 2nd generation DSCT | 3rd generation DSCT | p value |
---|---|---|---|---|
(N=246) | (N=123) | (N=123) | ||
Tube voltage, n (%) | <0.001 | |||
70 kV | 52 (21.1) | - | 52 (42.3) | |
80 kV | 48 (19.5) | 30 (24.4) | 18 (14.6) | |
90 kV | 15 (6.1) | - | 15 (12.2) | |
100 kV | 82 (33.3) | 60 (48.8) | 22 (17.9) | |
110 kV | 3 (1.2) | - | 3 (2.4) | |
120 kV | 43 (17.5) | 30 (24.4) | 13 (10.6) | |
140 kV | 3 (1.2) | 3 (2.4) | - | |
Tube current (mAs) (mean [range]) | 196.5 [160.8–265.3] | 174.0 [140.5–214.0] | 239.0 [179.8–279.0] | <0.001 |
Contrast agent (ml) | 101.0 [92.0–107.3] | 101.0 [93.0–110.0] | 101.0 [91.0–106.0] | 0.618 |
Gating, n (%) | <0.001 | |||
Prospective | 217 (88.2) | 96 (78.0) | 121 (98.4) | |
Retrospective | 29 (11.8) | 27 (22.0) | 2 (1.6) | |
DLP (mGy*cm) | 242.5 [169.0–376.5] | 264.0 [176.0–406.0] | 210.0 [164.0–356.0] | 0.065 |
Effective dose (mSv) (mean [range]) | 3.4 [2.4–5.2] | 3.7 [2.5–5.7] | 2.9 [2.3–5.0] | 0.064 |