Audit results were determined as Pass Optimal Level (deviations within 3.3%), Pass Action Level (greater than 3.3% but within 5%) and Out of Tolerance (beyond 5%), as well as Reported Not Scored (RNS). The audited treatment plans included open and half blocked fields, wedges and lung inhomogeneities. Absolute dose point measurements were performed with Farmer-type ionization chambers. This work reports on design and findings of a comprehensive 3D conformal radiotherapy (3D-CRT) Level III audit.Materials and methodsThe audit was conducted as onsite audit using an anthropomorphic thorax phantom in an end-to-end test by the Australian Clinical Dosimetry Service (ACDS). Background and purposeIndependent dosimetry audits improve quality and safety of radiation therapy.
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