The design of an audit test for 60Co brachytherapy treatment planning system

Mohammad Javad Tahmasebi Birgani; Hadis Khorshidsavar; Ali Bagheri; Amir Danyaei; Neda Abdalvand

doi:10.4103/jmss.JMSS_47_19

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ORIGINAL ARTICLE

Year : 2022 \| Volume : 12 \| Issue : 2 \| Page : 133-137

The design of an audit test for ⁶⁰Co brachytherapy treatment planning system Mohammad Javad Tahmasebi Birgani¹, Hadis Khorshidsavar², Ali Bagheri³, Amir Danyaei², Neda Abdalvand⁴ ¹ Department of Medical Physics, Medicine School; Department of Radiation Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Science, Ahvaz, Iran ² Department of Medical Physics, Medicine School, Golestan Hospital, Ahvaz Jundishapur University of Medical Science, Ahvaz, Iran ³ Department of Radiation Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Science; Department of Radiation Oncology, Medicine School, Golestan Hospital, Ahvaz Jundishapur University of Medical Science, Ahvaz, Iran ⁴ Department of Radiation Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Science, Ahvaz; Department of Medical Physics, School of Medicine, Iran University of Medical Science, Tehran, Iran Correspondence Address: Hadis Khorshidsavar Department of Medical Physics, Medicine School, Ahvaz Jundishapur University of Medical Science, Ahvaz Iran Source of Support: None, Conflict of Interest: None DOI: 10.4103/jmss.JMSS_47_19

Background: Auditing the treatment planning system (TPS) software for a radiotherapy unit is of paramount importance in any radiation therapy department. A Plexiglas phantom was proposed to measure the ionization of ⁶⁰Co high dose rate (HDR) source and compare dose points in the planning system for auditing and verifying TPS. Methods: Auditing was performed using a Plexiglas phantom in an end-to-end test, and relative dose points were detected by a farmer-type ionization chamber and compared with the relative dose of similar points in TPS. The audit results were determined as pass optimal level (<3.3%), pass action level (between 3.3% and 5%), and out of tolerance (>5%). Results: The comparison of the collected data revealed that 80% of the measured values were ≤5% in the pass level, and 20% of the points were out of tolerance (between 5% and 6.99%). Conclusion: This study documented the appropriateness of the dosimetry audit test and this phantom design for the HDR brachytherapy TPS.



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