Feasibility study of volumetric modulated arc therapy with Halcyon™ linac for total body irradiation

Radiation Oncology

Table 3 γ pass rates with EPID and ArcCHECK and point dose differences in each segment

Segment	Seg 1	Seg 2	Seg 3	Seg 4	Seg 5	Seg 6	Seg 7
EPID
1%/1 mm	96.6	96.2	96.3	97.2	97.3	97.3	98.0
2%/2 mm	100	100	100	100	100	100	100
ArcCHECK
2%/2 mm	91.7	89.9	93.6	81.0	81.6	84.4	90.6
3%/2 mm	97.7	97.8	99.4	93.6	94.6	93.8	96.8
3%/3 mm	98.2	98.9	99.7	96.3	97.1	97.0	98.9
Point dose discrepancy (%)	0.60	0.70	2.48	2.16	0.20	1.59	0.43

ISSN: 1748-717X