Comparison of intensity modulated radiotherapy (IMRT) with intensity modulated particle therapy (IMPT) using fixed beams or an ion gantry for the treatment of patients with skull base meningiomas

Table 2 Couch and gantry angles for patients

Patient No.	original photon IMRT	carbon/proton ion horizontal plan	proton gantry plan
1	helical Tomotherapy	(8, 90) (172, 90) (272, 90)	none
2	8 beam IMRT	(8, 90) (330, 90)	(8, 70) (8, 120)
3	8 beam IMRT	(172, 90) (210, 90)	(355, 240) (355, 270)
4	8 beam IMRT	(8,90) (335, 90)	none
5	8 beam IMRT	(8,90) (172, 90) (320, 90)	(0,150) (0, 305) (270, 60)

Case 2-5 were treated with a linear accelerator using step and shoot technique. (x, y) shows (couch angle, gantry angle)

ISSN: 1748-717X