Comparison study of two different treatment positions in patients receiving pelvic radiation for gynecologic cancer.

Intervention1: Radiation in prone position using Belly Board device: Comercially available device used to treat patients in prone position who are undergoing external beam pelvic radiation.Patients lie prone on the device during treatment.External beam radiation of 40-45 Gy in 1.8-2 Gy per fraction,one fraction daily,5 days a week, for 4-5 week duration.
Control Intervention1: Radiation in supine position: External beam radiation in supine position.External beam radiation of 40-45 Gy in 1.8-2 Gy per fraction,one fraction daily,5 days a week,for 4-5 week duration.