Geometric checks: treatment isocenter was between 0.31 ± 0.01 mm and 0.42 ± 0.02 mm with MPC, compared to 0.27 ± 0.01 mm averaged on all energies with the Winston-Lutz test. Results were analyzed for 6, 10, 15 MV flattened, and 6, 10 MV FFF beams. Dosimetric: the 2D array StarCheck (PTW) was used just after the MPC data acquisition. Geometric: routine mechanical tests, Winston-Lutz test for treatment isocenter radius. MPC data were acquired during 10 repetitions on different consecutive days.Īlternative independent checks were performed. The dosimetric checks: refer to a reference MV image and give the beam output, uniformity and center change relative to the reference. The geometric checks intend to test the treatment isocenter size and its coincidence with imaging devices, the positioning accuracy of the imaging systems, the collimator, the gantry, the jaws, the MLC leaves and the couch position. MPC performs geometric and dosimetric checks. Methodsĭata acquisition comprises a series of 39 images (12 with kV and 27 with MV detector) acquired at predefined positions without and with the IsoCal phantom in the beam, and with particular MLC pattern settings. In this study, preliminary tests with MPC were analyzed using all photon beam energies of our TrueBeam, comparing whenever possible with external independent checks. Machine Performance Check (MPC) is an application to verify geometry and beam performances of TrueBeam Linacs, through automated checks based on their kV-MV imaging systems.

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