The measured depth dose curves, dose profiles and diagonal profiles showed very good agreement with the preconfigured beam data, differences were within 1%-1mm.
Field output factors differences were less than 0.5% for all the field sizes measured with a mean dose difference of -0.1%.
Measured linac output for the 10x10 cm2 square field size at SSD=90cm and 10cm depth was 1cGy per MU, in concordance with machine calibration specifications from the vendor.The output was also verified calculating the dose on a virtual water phantom on the TPS with a 0.4% difference against reference value.
The difference between the in-water measured quality index TPR20, 10 of 0.627 and the one calculated on a virtual water phantom from isocentric doses at 10 cm and 20 cm depth was 0.77%.
The ArcCheck measured data from modulated plans were compared to the planned dose using the SNCPatient software leading to a mean value of 99.8% points passing 3%-3mm gamma evaluation with a 10% threshold.
The portal dosimetry for the same tests gave a mean value of 99.8% points passing 3%-3mm gamma evaluation in absolute dose mode.
The mean difference of the point doses measured with a pinpoint chamber 31016, inserted into the Easycube phantom, to the calculated doses was -0.12% with a maximum difference of -1.13%.