Table 2.

Assessment of Radiation Dose.

	Scenario 1	Scenario 2	p-Value
Total (n = 182)
CTDIvol (mGy)	15.3 [7.3–28.5]	15.3 [7.3–28.5]	NS
DLP (mGy*cm)	191 [103–314]	198 [94–345]	p < 0.001
Effective dose (mSv)	3.2 [1.8–5.3]	3.4 [1.5–5.9]	p < 0.001
Sequential scan mode (n = 150)
CTDIvol (mGy)	18.4 [10.9–31]	18.4 [10.9–31]	NS
DLP (mGy*cm)	214 [138–359]	227 [141–385]	p < 0.001
Effective dose (mSv)	3.6 [2.3–6.1]	3.9 [2.4–6.5]	p < 0.001
High-pitch spiral scan mode (n = 32)
CTDIvol (mGy)	3.3 [3.0–5.8]	3.3 [3.0–5.8]	NS
DLP (mGy*cm)	57 [48–88]	48 [40–80]	p < 0.001
Effective dose (mSv)	1.0 [0.8–1.5]	0.8 [0.6–1.4]	p < 0.001

Data are presented as median and interquartile ranges given in square brackets, as appropriate. Abbreviations: CAS-CT, calcium-scoring computed tomography; CCTA, coronary computed tomography angiography; DLP, dose length product; CTDIvol, computed tomography dose index; NS, non-significant. Notes: Scenario 1 incorporates the radiation dose of calcium-scoring CT (DLP 20 [16–22] mGy*cm) and calcium-scoring CT-derived CCTA, whereas Scenario 2 incorporates only the radiation dose of scout-view-derived CCTA.