Test purpose

Test the inter-fractional (long-term) repeatability of the IQM signal.

Test method

Inter-fraction repeatability was checked by delivering three IMRT treatments for more than seventy times in a period of thirty days. The chosen treatments were: a head & neck (H&N), a prostate and a test IMRT treatment. For each segment of the IMRT treatment sigma and M were evaluated over the number of repetitions (21 for H&N; 30 for prostate and „Test“ IMRT). In H&N and prostate tests gantry rotation and small fields of different shape and size were considered.

Test results

Global and local inter-fraction detector repeatability results demonstrate the optimal detector performance for highly complex IMRT treatment techniques.


IQM provides a high long-term signal reproducibility for complex IMRT plans.