Test purpose

Test the error detection sensitivity of the IQM System.

Test method

Errors were induced to an head & neck IMRT treatment composed by seven beams (gantry angles = 0°, 40°, 80°, 140°, 220°, 280°, 320°) generating five new treatments. Errors were induced modifying the number of delivered MU (between 1 MU and 3 MUs) and by introducing small deviations in leaf positions for each segment of each beam (mimicking an MLC bank error).

Test results

All errors introduced were detected by IQM. Errors were more easily detectable for a field of small size (approx. 6cm2).


IQM is capable of detecting small errors in MU and leaf positions. The error sensitivity is sufficient for clinical practice.