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. 2022;8(1):37-45.

SBRT/SRS patient-specific QA using GAFchromicTM EBT3 and FilmQATM Pro software

Giuseppe Stella  1   2 , Nina Cavalli  2 , Elisa Bonanno  2 , Lucia Zirone  3 , Giuseppina Rita Borzì  2 , Martina Pace  3 , Andrea Girlando  4 , Anna M Gueli  1 , Carmelo Marino  2
Affiliations

SBRT/SRS patient-specific QA using GAFchromicTM EBT3 and FilmQATM Pro software

Giuseppe Stella et al. J Radiosurg SBRT. 2022.

Abstract

The aim of this work is to verify the potential use of GAFchromicTM EBT3 and FILMQATM pro software for patient specific quality assurance (QA) for stereotactic radiosurgery (SRS) and stereotactic body radiotherapy (SBRT) treatment plans in clinical routine use. In particular, encephalic, pulmonary and lymph node treatments plans were selected for this study. The agreement between the calculated and measured dose distributions were evaluated in terms of ɣ index with 3%3mm, 2%2mm, 1.5%1.5mm and 3%1.5mm criteria. The obtained results were then compared to the routine pre-treatment verification method which uses electronic portal imaging device (EPID) and EPIQA analysis software. EBT3-FilmQA method results show a mean ɣ index passing rate >95% with 2%1.5mm analysis criteria and an improvement of about 7% compared with EPID-EPIQA method results.

Keywords: 2D dosimetry; patient dose; small fields; treatment planning system.

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Figures

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Figure 1
Figure 1
Normalized Pixel Value (%) vs delivered dose and the related experimental data fit for the 6X-FFF (for each acquisition channel).
Figure 2
Figure 2
Gamma passing rate mean value, for each criteria, obtained with EPID-EPIQA and GAF-FilmQA Pro methods.
Figure 3
Figure 3
Results by relating the modulation coefficient obtained from TPS and the γ passing rate obtained with the two verification methods.
Figure 4
Figure 4
Gamma passing rate results obtained, both with the EPID-EPIQA and EBT3-FilmQA methods vs % maximum dose value from TPS.
See this image and copyright information in PMC

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