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The EQUAL-ESTRO audit on geometric reconstruction techniques in brachytherapy
Amélie Roué1, Ivaldo H Ferreira, Jan Van Dam
1EQUAL-ESTRO Laboratory, Villejuif, France. info@equal-estro.org
Summary
A new geometric check procedure for brachytherapy treatment planning systems was developed. This external audit helps identify and correct reconstruction errors, improving radiation therapy quality assurance.
Area of Science:
- Medical Physics
- Radiotherapy
- Quality Assurance
Background:
- The European Quality Laboratory (EQUAL) developed a geometric check procedure for brachytherapy reconstruction techniques.
- This initiative was part of the European Society for Therapeutic Radiology and Oncology's (ESTRO) ESQUIRE project, managed by the Braphyqs task group.
Purpose of the Study:
- To develop and implement a standardized geometric check procedure for brachytherapy treatment planning systems.
- To assess the effectiveness of local geometric reconstruction techniques in participating centers.
Main Methods:
- A 'Baltas' phantom was mailed to participating centers for geometric reconstruction checks.
- The procedure was initially validated within the Braphyqs Network before being opened to other centers.
Main Results:
- 152 reconstructions have been checked since November 2002.
- 86% of results were within acceptance levels after the first check; 14% required a second check.
- Re-checks confirmed that 98% of reconstructions met acceptance criteria, with only 2% remaining outside the acceptable range.
Conclusions:
- The geometric check procedure is available from EQUAL Laboratory for all brachytherapy centers.
- External audits effectively reveal errors missed by routine clinical quality control.
- The observed decrease in deviations highlights the value of this external audit for improving brachytherapy quality.