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It was the aim of the Tomotherapy dosimetry intercomparison of the year 2015 to check the absolute dosimetry and to perform an end-to-endtest.
The cheese phantom setup, as established in the 2014 dosimetry intercomparison, was applied for both tests.
Altogether five Tomotherapy machines were checked. One individual plan was irradiated in a wrong setup and excluded from the evaluation. 36 measurements were therefore evaluable for the TLD and ionisation chamber setup.
With both measurement techniques, all dose Point evaluations except one single ionisation chamber measurement led to a good result. The corresponding mean values are 1.006 ± 0.009 and 1.004 ± 0.010.
This dosimetry intercomparison has proven the high dosimetry level in all Swiss Tomotherapy sites when an end-to-end test is performed: All
checked measurements show good or even excellent results. This finding serves as a strong indicator that the cheese phantom setup developed in St.Gallen is also capable to check the dosimetry of complex end-to-end tests.