Table 3.

Dose to organs at risk in C‐arm plans and Halcyon plans for left‐sided treatments. Stated values indicate mean ± SD and statistical analysis was performed using the two‐sample Kolmogorov‐Smirnov test (at the 0.01 level).

	C‐arm	Halcyon MVCBCT HQ		Halcyon MVCBCT LD		Halcyon MVMV HQ		Halcyon MVMV LD
Breast_R (contralateral)
Max[Gy]	1.3 ± 0.4	2.8 ± 0.4	P < 0.001	1.8 ± 0.3	P < 0.01	0.9 ± 0.1	NS	1.0 ± 0.2	NS
Mean[Gy]	0.1 ± 0.0	1.0 ± 0.3	P < 0.001	0.6 ± 0.2	P < 0.001	0.3 ± 0.1	P < 0.001	0.2 ± 0.1	P < 0.01
V2Gy[cc]	0.0 ± 0.0	21.5 ± 24.5	P < 0.001	0.1 ± 0.1	NS	0.0 ± 0.0	NS	0.0 ± 0.0	NS
D0.1cc[Gy]	1.0 ± 0.3	2.7 ± 0.4	P < 0.001	1.7 ± 0.2	P < 0.001	0.9 ± 0.1	NS	0.9 ± 0.2	NS
Heart
Max[Gy]	11.1 ± 4.7	11.5 ± 4.1	NS	10.5 ± 4.0	NS	10.8 ± 6.2	NS	9.7 ± 4.0	NS
Mean[Gy]	0.9 ± 0.2	2.7 ± 0.3	P < 0.001	1.9 ± 0.2	P < 0.001	1.4 ± 0.3	P < 0.001	1.3 ± 0.2	P < 0.001
V5Gy[%]	0.7 ± 0.5	3.5 ± 1.6	P < 0.001	1.2 ± 0.7	NS	1.0 ± 1.0	NS	0.7 ± 0.5	NS
Lung_L (ipsilateral)
Mean[Gy]	4.2 ± 1.2	5.7 ± 1.2	NS	5.1 ± 1.2	NS	4.9 ± 1.7	NS	4.7 ± 1.2	NS
V5Gy[%]	15.4 ± 4.4	23.6 ± 4.4	P < 0.001	19.1 ± 4.2	NS	18.7 ± 5.8	NS	17.0 ± 4.3	NS
V10Gy[%]	8.8 ± 3.6	10.3 ± 3.7	NS	9.5 ± 3.6	NS	9.6 ± 5.0	NS	9.1 ± 3.5	NS
V20Gy[%]	6.0 ± 2.8	6.3 ± 2.8	NS	6.2 ± 2.8	NS	6.2 ± 3.9	NS	6.1 ± 2.7	NS
Lung_R (contralateral)
Mean[Gy]	0.0 ± 0.0	0.8 ± 0.2	P < 0.001	0.5 ± 0.2	P < 0.001	0.2 ± 0.0	P < 0.001	0.2 ± 0.0	P < 0.001

MVCBCT HQ, High‐quality megavoltage cone beam CT; MVCBCT LD, Low‐dose MVCBCT.