title: Comparison of 3-dimensional dose reconstruction system between fluence-based system and dose measurement-guided system.
abstract: COMPASS system (IBA Dosimetry, Schwarzenbruck, Germany) and ArcCHECK with 3DVH software (Sun Nuclear Corp., Melbourne, FL) are commercial quasi-3-dimensional (3D) dosimetry arrays. Cross-validation to compare them under the same conditions, such as a treatment plan, allows for clear evaluation of such measurement devices. In this study, we evaluated the accuracy of reconstructed dose distributions from the COMPASS system and ArcCHECK with 3DVH software using Monte Carlo simulation (MC) for multi-leaf collimator (MLC) test patterns and clinical VMAT plans. In a phantom study, ArcCHECK 3DVH showed clear differences from COMPASS, measurement and MC due to the detector resolution and the dose reconstruction method. Especially, ArcCHECK 3DVH showed 7% difference from MC for the heterogeneous phantom. ArcCHECK 3DVH only corrects the 3D dose distribution of treatment planning system (TPS) using ArcCHECK measurement, and therefore the accuracy of ArcCHECK 3DVH depends on TPS. In contrast, COMPASS showed good agreement with MC for all cases. However, the COMPASS system requires many complicated installation procedures such as beam modeling, and appropriate commissioning is needed. In terms of clinical cases, there were no large differences for each QA device. The accuracy of the compass and ArcCHECK 3DVH systems for phantoms and clinical cases was compared. Both systems have advantages and disadvantages for clinical use, and consideration of the operating environment is important. The QA system selection is depending on the purpose and workflow in each hospital.
authors.affiliation: Department of Radiological Technology, Kumamoto University Hospital, Kumamoto, Japan. Electronic address: nkgc2003@yahoo.co.jp.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nakaguchi
authors.affiliation: Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ono
authors.affiliation: Graduate School of Health Sciences, Kumamoto University, Kumamoto, Japan.
authors.forename: Ryota
authors.initials: R
authors.lastname: Onitsuka
authors.affiliation: Department of Radiological Technology, Kumamoto University Hospital, Kumamoto, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Maruyama
authors.affiliation: Department of Radiological Technology, Kumamoto University Hospital, Kumamoto, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Shimohigashi
authors.affiliation: Department of Radiological Technology, Kumamoto University Hospital, Kumamoto, Japan.
authors.forename: Yudai
authors.initials: Y
authors.lastname: Kai
mesh_terms: D006801:Humans; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011785:Quality Assurance, Health Care; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D012984:Software
keywords: 3-Dimensional measurement; 3-Dimensional reconstruction; IMRT; Quality assurance; Verification