Table I.

The fields (6 and 18 MV photons) used in the validation calculations are provided. A label is given for each test-field class, the jaw settings, the multileaf collimator (MLC) settings, the monitor units per field (MU), and the calculation method used. The calculation methods are indicated by letter abbreviations: Hybrid (HM), Analytic 1 (A1), Analytic 2 (A2), Pinnacle segmented multileaf collimator (SMLC) implemented in PINNACLE³ v6.2b (pinn v6.2b), and Pinnacle SMLC and sliding window (DMLC) implemented in PINNACLE³ v7.6c (pinn v7.6c).

Label	Jaws (cm2)	MLC setup	MU	Calculation methods
Leaf tips	10×24	Leaf tips on CAX	50	HM, A1, A2
Even teeth	10×24	odd retracted	100	HM, A1, A2
Odd teeth	10×24	even retracted	100	HM, A1, A2
Closed	10×24	closeda	999	HM, A1, A2
Closed 5×5	5×5	closed	100	HM, A1, A2
Closed 10×10	10×10	closed	100	HM, A1, A2
Closed 15×15	15×15	closed	100	HM, A1, A2
Closed 20×20	20×20	closed	100	HM, A1, A2
Open	10×10	open	100	HM, A1, A2
1 mm gap	13×10	1 mm sliding window	100	HM, A1, A2
10 mm gap	13×10	1 cm sliding window	100	HM, A1, A2
100 mm gap	13×10	10 cm sliding window	100	HM, A1, A2
Clinical DMLC IMRT fieldsb	variable	field specific	Variable, 80-150	HM, A1, A2, pinn v7.6c
Clinical SMLC IMRT fieldsc	variable	field specific	Variable, 80-150	HM, pinn v6.2b, pinn v7.6c

^aMLC leaves are blocking the field with the leaf tips positioned behind the jaws.

^bTotal of 79 patient sliding window (DMLC) intensity modulated radiation therapy (IMRT) fields. 70 of these fields required split beams for delivery.

^cTotal of 29 patient segmented multileaf collimator (SMLC) IMRT fields.