ESTRO 2024 - Abstract Book

S4828

Physics - Quality assurance and auditing

ESTRO 2024

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[2] A.T. Davis, A.L. Palmer, A. Nisbet ‘Can different Catphan phantoms be used in a multi-centre audit of radiotherapy CT image quality?’. Phys. Med. 2020: 78 (38-47).

[3] X. Tian, E. Samei ‘Accurate assessment and prediction of noise in clinical CT images’ Med. Phys. 2016: 43 (475-482)

1573

Poster Discussion

Automated audit of planned versus delivered radiotherapy

Jack P. C. Baldwin, Marcus Tyyger, Jonathan Entwisle, Curtis Parker-Milnes, John Lilley

Leeds Teaching Hospitals NHS Trust, Leeds Cancer Centre, Leeds, United Kingdom

Purpose/Objective:

In 2021 a previously unknown risk was identified in the radiotherapy pathway and investigated [1]. Upon import of a DICOM RTPLAN into the Oncology Management System (OMS) it is possible to select a linear accelerator (linac) that is unable to deliver the plan. The error was identified when routine pre-treatment checks detected a planned flattering filter free (FFF) 6 MV beam had erroneously been switched in the OMS to a flattened 6 MV beam. Three root causes were identified: 1. When there is a mismatch between the planned energy and the available energies on the linac in the OMS, the user is prompted to select a different energy/fluence type rather than preventing the user selecting that linac.

2. During checking of the parameters in the OMS the mouse wheel is used to scroll down the page, and this can inadvertently change parameters when a drop-down box is selected.

3. The third-party commercial software used locally for comparison of the plan in the Treatment Planning System (TPS) and the OMS did not detect errors in the FFF status.

The identification of this error triggered an audit into our previously delivered plans to identity if this had occurred previously.

Material/Methods:

All radiotherapy plans are stored in the local radiotherapy picture archiving and communication system (PACS) archive. An audit pipeline was created to extract all RTPLAN files from the PACS archive via a DICOM SCP service. A