Comprehensive External Audit for HDR Brachytherapy Systems – The National Experience

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652052%3A_____%2F18%3AN0000031" target="_blank" >RIV/86652052:_____/18:N0000031 - isvavai.cz</a>

Výsledek na webu

<a href="https://docs.wixstatic.com/ugd/3110be_f271f132c62f4b788f07426476a369b3.pdf" target="_blank" >https://docs.wixstatic.com/ugd/3110be_f271f132c62f4b788f07426476a369b3.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Comprehensive External Audit for HDR Brachytherapy Systems – The National Experience

Popis výsledku v původním jazyce

Brachytherapy is an important modality for cancer treatment with radiation. Dose distribution around radioactive sources is not as easily measurable as in case of external beams due to the large dose gradients and a shortage of convenient detectors, therefore QA is challenging. This contribution describes design of the audit in the Czech Republic for brachytherapy systems and shows the results obtained in 1996 – 2018 for 30 audited brachytherapy sources. Following parameters are evaluated within the audit: 1) Accuracy of TPS calculation. Monte Carlo data from TG-43 have been used for analytical model used as an independent tool to verify accuracy of TPS calculation. 2) Accuracy of source calibration. Air-kerma strength is measured by in-air method. 3) Accuracy and precision of source positioning. 4) Accuracy and precision of reconstruction process. Systematic differences in calibration techniques (well-type chamber versus in-air method with Farmer chamber) will be discussed. The most important findings will be reported to point out the weakest points in source positioning as a lessons learned. The progress in imaging methods used for brachytherapy planning is well demonstrated. Analysis of results for 30 brachytherapy audits have been performed. Based on the results, the weakest points in QA of HDR sources for brachytherapy observed in last 22 years will be reported. Presented at 18th Asia-Oceania Congress of Medical Physics & 16th South-East Asia Congress of Medical Physics, A sustainable Future for Medical Physics: Book of Abstracts, 11th-14th November 2018, Kuala Lumpur, Malaysia.

Název v anglickém jazyce

Comprehensive External Audit for HDR Brachytherapy Systems – The National Experience

Popis výsledku anglicky

Brachytherapy is an important modality for cancer treatment with radiation. Dose distribution around radioactive sources is not as easily measurable as in case of external beams due to the large dose gradients and a shortage of convenient detectors, therefore QA is challenging. This contribution describes design of the audit in the Czech Republic for brachytherapy systems and shows the results obtained in 1996 – 2018 for 30 audited brachytherapy sources. Following parameters are evaluated within the audit: 1) Accuracy of TPS calculation. Monte Carlo data from TG-43 have been used for analytical model used as an independent tool to verify accuracy of TPS calculation. 2) Accuracy of source calibration. Air-kerma strength is measured by in-air method. 3) Accuracy and precision of source positioning. 4) Accuracy and precision of reconstruction process. Systematic differences in calibration techniques (well-type chamber versus in-air method with Farmer chamber) will be discussed. The most important findings will be reported to point out the weakest points in source positioning as a lessons learned. The progress in imaging methods used for brachytherapy planning is well demonstrated. Analysis of results for 30 brachytherapy audits have been performed. Based on the results, the weakest points in QA of HDR sources for brachytherapy observed in last 22 years will be reported. Presented at 18th Asia-Oceania Congress of Medical Physics & 16th South-East Asia Congress of Medical Physics, A sustainable Future for Medical Physics: Book of Abstracts, 11th-14th November 2018, Kuala Lumpur, Malaysia.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20601 - Medical engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů