A Dosimetric Comparison of VMAT and IMRT for Head & Neck and Pelvis Cancers

Cancer, which is the uncontrolled division of cells, a leading fatal disease in world with high mortality rates. It can be treated using several methods, including radiotherapy, involves ionizing radiation. Radiotherapy on basis source placement has two types, i.e. brachytherapy and external beam radiotherapy. External radiotherapy evolved from 2-D conventional therapy to 3-D Conformal (3D-CRT) then intensity-modulated (IMRT). Modern radiation techniques such as IMRT improve dose conformity sparing organs at risk. Volumetric modulated arc (VMAT) newly developed technique that uses treatment arcs. In this report, dosimetry comparison was performed between VMAT. This study conducted Department Institute Nuclear Medicine Oncology Lahore (INMOL). Two types cancer patients were selected for comparison, i.e., five Nasopharyngeal Carcinoma ten Prostate Carcinoma. Simulation these done help CT Simulator. The oncologists delineated all target volumes organs. Then suitable fields/arcs applied, cover effectively. followed by optimization plans both every patient. Finally, evaluating parameters compared, volume coverage, index, homogeneity organ doses, monitor units. We obtained better results indices VMAT (1.16 1.25) than (1.24 1.30). too. Also, shows very few units (468 733) compared (2325 2149). On obtained, it concluded IMRT. will enhance efficiency takes less time obtain required results. scatter delivered