Table 2.

Dose to organs at risk in C‐arm plans and Halcyon plans for right‐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
	Value	Value	P	Value	P	Value	P	Value	P
Breast_L (contralateral)
Max[Gy]	1.5 ± 0.4	3.3 ± 0.4	P < 0.001	2.1 ± 0.4	P < 0.001	1.6 ± 0.2	NS	1.4 ± 0.2	NS
Mean[Gy]	0.2 ± 0.2	1.1 ± 0.2	P < 0.001	0.6 ± 0.1	P < 0.001	0.7 ± 0.1	P < 0.001	0.4 ± 0.1	P < 0.001
V2Gy[cc]	0.1 ± 0.2	68.6 ± 35.8	P < 0.001	0.6 ± 1.4	NS	0.0 ± 0.0	NS	0.0 ± 0.0	NS
D0.1cc[Gy]	1.3 ± 0.3	2.9 ± 0.6	P < 0.001	1.9 ± 0.3	P < 0.001	1.5 ± 0.3	P < 0.01	1.2 ± 0.2	NS
Heart
Max[Gy]	3.0 ± 1.0	5.3 ± 0.7	P < 0.001	4.2 ± 0.7	P < 0.01	4.4 ± 0.8	NS	3.6 ± 0.8	NS
Mean[Gy]	0.4 ± 0.3	2.0 ± 0.3	P < 0.001	1.2 ± 0.2	P < 0.001	1.0 ± 0.1	P < 0.001	0.8 ± 0.1	P < 0.001
V5Gy [%]	0.0 ± 0.0	0.1 ± 0.2	NS	0.0 ± 0.0	NS	0.0 ± 0.0	NS	0.0 ± 0.0	NS
Lung_R (ipsilateral)
Mean[Gy]	5.4 ± 1.3	7.1 ± 1.3	P < 0.001	6.5 ± 1.4	P < 0.001	7.2 ± 1.2	P < 0.01	6.2 ± 1.4	NS
V5Gy [%]	19.2 ± 4.5	28.9 ± 4.7	P < 0.001	23.2 ± 4.2	P < 0.001	24.3 ± 3.4	NS	21.0 ± 4.3	NS
V10Gy [%]	11.6 ± 3.4	13.5 ± 3.5	NS	12.7 ± 3.5	NS	14.9 ± 2.7	NS	12.3 ± 3.5	NS
V20Gy [%]	8.3 ± 2.9	9.0 ± 3.1	NS	8.9 ± 3.1	NS	11.1 ± 2.4	NS	8.9 ± 3.1	NS
Lung_L (contralateral)
Mean[Gy]	0.1 ± 0.1	0.8 ± 0.2	P < 0.001	0.4 ± 0.1	P < 0.001	0.3 ± 0.1	P < 0.001	0.2 ± 0.1	P < 0.001

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