Table 3:

Calculated EDs and conversion factors of six scan modes run with four different heart rates on a 1-year-old phantom. ED was determined using ICRP Publication 103 definition. CoVs of these quantities per scan mode are presented in percentage. For single-beat reconstruction [Snapshot Segment], 2-beat multicycle reconstruction [Snapshot Burst], and up to 4-beat multicycle reconstruction [Snapshot Burst Plus]. Three helical scans with 90-bpm were performed with a tube current three times that of the tube current of other heart rate scans, affecting the ED values. Assuming linearity of dose with tube current, we normalized the EDs, dividing by a factor of 3 to compare with EDs of the other heart rate scans; the normalized ED values are displayed in parentheses.

Scan Description	Heart Rate (bpm)	Conversion factor (mSv·mGy−1·cm−1)	CoV* Conversion factor (%)	ED (mSv)	CoV* ED (%)
Axial	90	0.0940	5.59	2.9	5.59
	110	0.1019		3.2
	130	0.1067		3.3
	150	0.1053		3.3
Axial Padding 100 ms	90	0.0985	1.39	5.6	1.39
	110	0.0984		5.6
	130	0.1014		5.8
	150	0.0993		5.6
Helical Single-beat Reconstruction	90	0.0919	1.16	(7.5)	1.16
	110	0.0896		7.3
	130	0.0897		7.4
	150	0.0903		7.4
Helical 2-beat Multicycle Reconstruction	90	0.0907	1.52	(8.1)	5.29
	110	0.0912		7.5
	130	0.0889		7.3
	150	0.0884		7.3
Helical Up to 4-beat Multicycle Reconstruction	90	0.0925	1.45	(9.5)	4.36
	110	0.0911		9.6
	130	0.0905		8.9
	150	0.0893		8.8
Helical TCM**	90	0.0959	2.35	6.2	3.79
	110	0.0930		5.8
	130	0.0924		5.9
	150	0.0906		6.3

^*Coefficient of variation

^**Tube Current modulation