Dose Variation According to the Direction of Gantry Rotation of High Energy Linear Accelerator Couch

Couch consisting of carbon and acrylic material was irradiated with Gantry and the dose to the tumor was compared with Min, Max and Mean values. Novails Tx dedicated treatment table was irradiated with 6 MV and 10 MV, and the attenuation coefficient of the does according to the angle (0°, 140°, 180°) were compared and analyzed when transmitting the table. As a result of comparing the dose values obtained in this paper, it was confirmed that the dose distribution to the normal tissues in the carbon material table is narrower than the acrylic material. When the experiment was conducted with 6 MV and 10 MV on the Novils TX, it was confirmed that the loss was the largest at 140° due to the density of the table. It is considered that the treatment effect will be better with the correction because the treatment is performed without the correction according to the angle when the usual radiation treatment is performed