Acceptance testing of photon beam model in Axesse accelerator in two intensity-modulated treatment planning systems

Abstract

Objective To investigate the acceptance testing the photon beam model in Axesse accelerator in Monaco Oncentra treatment planning systems (TPS), in order to establish an integral method for the acceptance both systems at the same time. Methods The conflicting parameters the two TPSs were determined before acceptance, the corresponding parameters in the accelerator were adjusted to the overlapping values. The acceptance test was performed from the aspects point dose, surface dose, characteristic simulation multi-leaf collimator (MLC). The test case for point dose was designed based on TRS430, TG53, practical situations. The test case for surface dose included conventional radiation field intensity-modulated radiotherapy (IMRT) cases. The test the characteristics MLC included concave-convex groove, leakage, values of and Gain . Results The error most point doses were within 4%, only some measuring points in the penumbra region outside the radiation field had an error of>4%. The γ pass rate the surface dose tests IMRT cases was>90% at a value 3 mm/3% except three test cases. Oncentra could only simulate the situation with a positive offset value MLC, but Monaco could simulate the situation with both positive negative offset values MLC. Conclusions The results show that this method can accurately validate all the parameters the two systems realize the accurate acceptance Monaco Oncentra systems with Axesse accelerator. Both Monaco Oncentra models can meet the needs for clinical calculation. Key words: Threatment planning system commission; Multi-leaf collimator test; Dose verification; Error analysis