TABLE 1.

Volumetric modulated arc therapy (VMAT) field arrangement parameters.

	Arc range (°)	Collimator angle (°)	Jaw positions (X1, X2, Y1, Y2)
Plan A – 4 arc	50 – 181 181 – 50 50 – 181 181 – 50	355.0 5.0 90.0 90.0	10.0, 4.5, 9.1, 9.1 4.5, 10.0, 9.1, 9.1 4.0, 8.8, 9.6, 9.5 8.7, 4.0, 9.6, 9.5
Plan B – 5 arc	300 – 60 60 – 300 330 – 210 210 – 330 300 – 60	355.0 5.0 355.0 5.0 90.0	9.9, 4.6, 9.0, 9.1 4.0, 10.5, 9.1, 9.0 9.9, 4.6, 9.0, 9.0 4.0, 10.5, 9.0, 9.1 2.0, 8.8, 9.9, 9.2
Plan C – 6 arc bilat	50 – 215 215 – 50 155 – 310 310 – 155 155 – 215 215 – 155	350.0 10.0 355.0 5.0 90.0 90.0	12.5, 3.5, 10.5, 10.5 3.5, 12.5, 10.5, 10.5 11.0, 5.0, 10.5, 10.5 5.0, 11.0, 10.5, 10.5 10.0, 6.0, 16.5, 16.5 6.0, 10.0, 16.5, 16.5