IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-11-12-45439 Original Research Paper Dosimetric Comparison Of Pre-Selected Beam Orientation And Beam Angle Optimization In Intensity Modulated Radiation Therapy Plans For Nasopharyngeal Carcinoma. A K Dr. Jitendra Nigam Dr. Piyush Kumar Dr. December 2022 11 12 01 02