Test purpose

Investigation of the constancy of IQM signal for conventional intensity modulated radiation therapy (IMRT) and rotational volumetric modulated arc therapy (VMAT)

Test method

The stationary and rotational dosimetric constancy of IQM was evaluated, using five field IMRT and single- and double-arc VMAT plans for prostate and head-and-neck (H&N) patients.

The plans were repeated three times for each measurement over several days to assess the constancy of IQM response.


IQM provides an effective means for realtime dosimetric verification of IMRT/VMAT treatment delivery.