Table 2.

Error detection sensitivity for AC, PDIP and combined processes with three settings of Gamma index for head and neck (H&N) treatment plans. δTotal, δColli, δDose, and δMLC correspond to the detection sensitivity of total error, collimator angulation error, dose error, and MLC error

Protocol	Process	δTotal(%)	δColli(%)	δDose(%)	δMLC(%)
3%/3 mm/Global	AC	54	44	30	87
	PDIP	40	48	10	47
	Combined	58	52	30	87
3%/3 mm/Local	AC	88	80	90	100
	PDIP	74	60	90	87
	Combined	92	84	100	100
2%/2 mm/Global	AC	76	68	70	93
	PDIP	50	52	30	60
	Combined	80	72	80	93