CT-BASED SIMULATION WITH LASER PATIENT MARKING

A CT-based simulator has been assembled based on a commercial CT scann er, virtual simulation software developed at the University of North C arolina and a laser drawing device to transfer the radiation portals f rom the virtual simulator to the patient. The simulation process can b e completed in approximately 1 h; under most cases, the treatment port als can be designed and the patient marked in one session. The device has an inherent accuracy of +/- 1 mm. The portal projection accuracy i n clinical cases is observed to be better than 2 mm.