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

Giuseppe Stella; Nina Cavalli; Elisa Bonanno; Lucia Zirone; Giuseppina Rita Borzì; Martina Pace; Andrea Girlando; Anna M Gueli; Carmelo Marino

SBRT/SRS patient-specific QA using GAFchromic^TM EBT3 and FilmQA^TM Pro software

J Radiosurg SBRT. 2022;8(1):37-45.

Authors

Giuseppe Stella^{1

2}, Nina Cavalli², Elisa Bonanno², Lucia Zirone³, Giuseppina Rita Borzì², Martina Pace³, Andrea Girlando⁴, Anna M Gueli¹, Carmelo Marino²

Affiliations

¹ Physics for Dating Diagnostic Dosimetry Research and Applications (PH3DRA) Laboratories, Dipartimento di Fisica e Astronomia, Università di Catania, via Santa Sofia 64, I-95123 Catania, Italy.
² Department of Medical Physics - Humanitas, Istituto Clinico Catanese - contrada Cubba S.P. 54 n.11, Misterbianco (CT), Italy.
³ School of Medical Physics, University of Catania, Italy.
⁴ Department of Radiotherapy - Humanitas, Istituto Clinico Catanese - contrada Cubba S.P. 54 n.11, Misterbianco (CT), Italy.

PMID: 35387411
PMCID: PMC8930055

Abstract

The aim of this work is to verify the potential use of GAFchromic^TM EBT3 and FILMQA^TM 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.