ESTRO 2021 Abstract Book

S328

ESTRO 2021

originated from a patient with exceptionally large tumor volume. 31/34 (91%) were classified as true data errors.

Conclusion The presented tool facilitates effective clinical trial monitoring. It offers a holistic view of the status of the study and allows informed adaptation of monitoring activities. It ensures the timely and accurate management of data quality issues. The platform and learned insights can serve as the basis for the development of advanced tools to help the dissemination of knowledge, and integration of evidence-based treatment planning. OC-0428 Improving local Patient Specific Quality Assurance – a novel remote auditing approach J. Lehmann 1 , M. Hussein 2 , S. Siva 3 , A. Moore 4 , T. Standen 1 , B. Subramanian 5 , P. Greer 1 , C. Clark 6 1 Calvary Mater Newcastle, Radiation Oncology, Newcastle, Australia; 2 National Physical Laboratory, National Physical Laboratory, Teddington, United Kingdom; 3 Peter MacCallum Cancer Centre, Radiation Oncology, Melbourne, Australia; 4 TROG Cancer Research, QA, Newcastle, Australia; 5 Genesis Cancer Care, Radiation Oncology, Ringwood, Australia; 6 University College London Hospitals, Radiation Oncology, London, United Kingdom Purpose or Objective Radiation therapy delivery has been shown to significantly impact clinical outcomes including patient survival [1]. For intensity modulated treatments, facilities undertake detailed checks for each individual treatment plan, referred to as Patient Specific Quality Assurance (PSQA). External dosimetry audits are widely implemented as additional measures to ensure safety and standards of the complex technical processes involved with the delivery of radiation therapy. These generally assess the ability of a facility to correctly plan and deliver a specific radiation treatment to a model of the patient. Dosimetry audits have found problems despite facilities passing PSQA [2]. Hence a new concept for dosimetry audits which assesses the ability of a facility’s clinical PSQA to detect errors is needed.