Acceptance test for fan beam CT linac treatment planning system using AAPM TG 119 test cases

To assess accurately the URT treatment planning system from the United Imaging Healthcare, the American Academy of Pain Medicine (AAPM) TG 119 test plans for Intensity-Modulated Radiation Therapy (IMRT) and Volumetric-Modulated Arc Therapy (VMAT) were used.

Based on the URT-Linac 506C, the plans were sent to the phantom. The overall accuracy was tested and examined using five geometry tests supplied in TG 119 for various treatment modes of IMRT and VMAT, with three types of beams using the Flattening Filter modality, estimated using the URT-TPS Monte Carlo algorithm. Moreover, a Farmer-type ion chamber was used to measure the point values, and a film was used to measure the fluence.

The disparities between the measured point doses and the anticipated doses for the FF photon beams for static MLC, dynamic MLC, and VMAT were within 2.16%, 1.89%, and 1.89%, respectively. The TG 119 report confidence limits were all met, and SMLC, DMLC, and VMAT had gamma passing rates greater than 99.80%, 99.60%, and 99.70%, respectively.

The URT treatment planning system and the URT-Linac 506C have correctly commissioned IMRT and VMAT processes, according to this analysis, which was completed following the recommendations given by TG 119.