S Russo1, A Mirandola2, S Molinelli2, E Mastella2, A Vai2, G Magro2, A Mairani3, D Boi4, M Donetti5, M Ciocca2. 1. Fondazione CNAO, Pavia, Italy. Electronic address: stefania.russo@cnao.it. 2. Fondazione CNAO, Pavia, Italy. 3. Fondazione CNAO, Pavia, Italy; HIT - Heidelberg Ion Beam Therapy Center, Heidelberg, Germany. 4. Department of Physics, Università degli Studi di Cagliari, Cagliari, Italy. 5. Fondazione CNAO, Pavia, Italy; Istituto Nazionale di Fisica Nucleare, Section of Torino, Torino, Italy.
Abstract
INTRODUCTION: Pencil beam scanning technique used at CNAO requires beam characteristics to be carefully assessed and periodically checked to guarantee patient safety. This study aimed at characterizing the Lynx® detector (IBA Dosimetry) for commissioning and periodic quality assurance (QA) for proton and carbon ion beams, as compared to EBT3 films, currently used for QA checks. METHODS AND MATERIALS: The Lynx® is a 2-D high-resolution dosimetry system consisting of a scintillating screen coupled with a CCD camera, in a compact light-tight box. The scintillator was preliminarily characterized in terms of short-term stability, linearity with number of particles, image quality and response dependence on iris setting and beam current; Lynx® was then systematically tested against EBT3 films. The detector response dependence on radiation LET was also assessed. RESULTS: Preliminary results have shown that Lynx is suitable to be used for commissioning and QA checks for proton and carbon ion scanning beams; the cross-check with EBT3 films showed a good agreement between the two detectors, for both single spot and scanned field measurements. The strong LET dependence of the scintillator due to quenching effect makes Lynx® suitable only for relative 2-D dosimetry measurements. CONCLUSION: Lynx® appears as a promising tool for commissioning and periodic QA checks for both protons and carbon ion beams. This detector can be used as an alternative of EBT3 films, allowing real-time measurements and analysis, with a significant time sparing.
INTRODUCTION: Pencil beam scanning technique used at CNAO requires beam characteristics to be carefully assessed and periodically checked to guarantee patient safety. This study aimed at characterizing the Lynx® detector (IBA Dosimetry) for commissioning and periodic quality assurance (QA) for proton and carbon ion beams, as compared to EBT3 films, currently used for QA checks. METHODS AND MATERIALS: The Lynx® is a 2-D high-resolution dosimetry system consisting of a scintillating screen coupled with a CCD camera, in a compact light-tight box. The scintillator was preliminarily characterized in terms of short-term stability, linearity with number of particles, image quality and response dependence on iris setting and beam current; Lynx® was then systematically tested against EBT3 films. The detector response dependence on radiation LET was also assessed. RESULTS: Preliminary results have shown that Lynx is suitable to be used for commissioning and QA checks for proton and carbon ion scanning beams; the cross-check with EBT3 films showed a good agreement between the two detectors, for both single spot and scanned field measurements. The strong LET dependence of the scintillator due to quenching effect makes Lynx® suitable only for relative 2-D dosimetry measurements. CONCLUSION: Lynx® appears as a promising tool for commissioning and periodic QA checks for both protons and carbon ion beams. This detector can be used as an alternative of EBT3 films, allowing real-time measurements and analysis, with a significant time sparing.
Authors: Chinmay D Darne; Daniel G Robertson; Fahed Alsanea; Charles-Antoine Collins-Fekete; Sam Beddar Journal: Nucl Instrum Methods Phys Res A Date: 2021-12-16 Impact factor: 1.455
Authors: Dayananda Sharma Shamurailatpam; A Manikandan; K Ganapathy; M P Noufal; Kartikeshwar C Patro; T Rajesh; R Jalali Journal: J Med Phys Date: 2020-07-20
Authors: Alessandro Vai; Alfredo Mirandola; Giuseppe Magro; Davide Maestri; Edoardo Mastella; Andrea Mairani; Silvia Molinelli; Stefania Russo; Michele Togno; Sara La Civita; Mario Ciocca Journal: Int J Part Ther Date: 2019-11-26
Authors: Nicholas P Nelson; Wesley S Culberson; Daniel E Hyer; Theodore J Geoghegan; Kaustubh A Patwardhan; Blake R Smith; Ryan T Flynn; Jen Yu; Suresh Rana; Alonso N Gutiérrez; Patrick M Hill Journal: Med Phys Date: 2021-04-09 Impact factor: 4.506