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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: J Cardiovasc Comput Tomogr. 2017 Mar 22;11(4):249–257. doi: 10.1016/j.jcct.2017.03.002

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