An external dosimetry audit programme to credential static and rotational IMRT delivery for clinical trials quality assurance

External dosimetry audits give confidence in the safe and accurate delivery of radiotherapy. The RTTQA group have performed an on-site audit programme for trial recruiting centres, who have recently implemented static or rotational IMRT, and those with major changes to planning or delivery systems.Measurements of reference beam output were performed by the host centre, and by the auditor using independent equipment. Verification of clinical...