Experience with remote electronic portal imaging device-based dosimetric auditing for static and rotational intensity modulated radiotherapy.

The aim of this work was to evaluate results of a remote electronic portal imaging based dosimetric auditing method using Task-Group 218 clinical gamma evaluation criteria (3%,2 mm, 10% dose threshold). For intensity modulated radiation therapy the results were (mean ± 1 SD) 97.9 ± 4.5% with 31/34 audits passing (optimal level, $\ge$ 95%) and 3/34 audits failing (action level, $<$ 90%). For volumetric modulated arc therapy the results were 98.5 ± 2.3% with 32/36 audits passing (optimal level) and 4/36 passing (tolerance level, $\ge$ 90% and $<$ 95%). The audit has been successfully applied globally for clinical trial quality assurance.