Table 1.

Step‐and‐shoot IMRT: ion chamber dose error and y analysis for all detectors receiving $\ge 30\%$ of the “normalization” dose.

Plan	Plan Type	6 MV		15 MV
		IC Dose‐Difference, %	γ(3%, 3mm)	IC Dose‐Difference, %	γ(3%, 3mm)
1	Phantom (Prostate)	$-0.2$	100	–	–
2	Prostate	0.9	99.8	1.2	100
3	H&N	$-0.9$	100	1.2	99.8
4	H&N	$-0.8$	100	$-0.2$	100
5	H&N (split beam)	0.2	92.0	0.8	95.4
6	H&N (split beam)	$-0.6$	99.6	0.8	–
7	Abdomen (split beam)	0.5	95	1.5	–