Noncoplanar beam angle range

The dummy model was used to simulate the positioning of head, chest and abdominal tumor patients, rotate the treatment table in stages at 5° intervals, rotate the frame after each rotation, and record the angle range that the gantry can reach, so as to obtain the non-coplanar irradiation angle range that can be achieved by conventional medical linear accelerators. The irradiation range of non-coplanar irradiation angle that can be achieved by cage-like radiotherapy system is determined by its own structural design characteristics.