Experimental validation of a collision avoidance software in radiation therapy
Sanchez Rodriguez, Jose Antonio
MetadataShow full item record
Cancer is one of the deadliest diseases in the United States. Advancements in the field of radiation therapy, like the development of image-guided radiation therapy, intensity modulation, and volumetric-modulated arc therapy, has increased the conformity of the dose distribution to the cancerous tumor while decreasing the dose administered to the surrounding normal tissue. Even greater dose conformity has been achieved by incorporating non-coplanar beam geometries to the treatment. The non-coplanar geometry can be achieved by implementing couch rotations in one or various directions, known as pitch, roll and yaw. Pitch and roll rotations are specially achieved with the use of six-degree-of-freedom couches. However, the increased complexity of the non-coplanar treatment enhances the possibility of couch-gantry or patient-gantry collision, a safety concern. To prevent collisions from occurring, this work presents a collision avoidance computer program. It simulates a treatment plan using a linac, couch and patient model using a collision detection algorithm. Accuracy tests show a software with an average error of 2.4 cm, with some potential “blind spots” that increase the error to 4.6 cm. Data analysis suggest the need of a 3.0 cm safety buffer to increase the collision prediction capabilities of the program. This software should provide a good initial step for dosimetrists, physicists and therapists to prevent injuries and equipment damage, while improving workflow and productivity.