The Study Of Jaws-only IMRT Treatment Planning System On Planning And Executing Feasibility

The evolution of modern radiotherapy techniques is closely correlated with the development of computer science. As one of major treatment modality for cancer treatment, accurate radiotherapy techniques have been widely implemented with the advance of computer technology. Traditional 2-D radiotherapy techniques have been replaced by CT simulation techniques and more recently by 3D CRT and IMRT. Jaws-only IMRT is one of recently developed IMRT techniques and a commercial treatment planning system, Prowess Panther TPS (Prowess, US), has been introduced to the clinic to realize jaws-only IMRT treatment planning. Currently some centers in China have installed this TPS.In the present work, the theory behind jaws-only IMRT has been briefly reviewed, including the basic algorithms and the methods to realize jaws-only IMRT delivery. The feasibility of Prowess Panther TPS in jaws-only IMRT treatment planning has been evaluated. The advantages and disadvantages of jaws-only IMRT have been determined by comparison of jaws-only IMRT treatment plans between different linac conditions and tumor locations, and by comparison of jaws-only IMRT with MLC-IMRT. The jaws-only IMRT, with its benefit of ease of use, can provide a relatively conformal dose distribution which can fulfill most of clinical requirements for IMRT. It can be used in treatment of brain tumor, nasopharyngeal carcinoma, cervix cancer, and so on. Our experiments have demonstrated that the jaws-only IMRT techniques were a suitable solution to implement IMRT treatment in radiotherapy departments which had installed a linac without MLC.