Commissioning and initial experience with a commercial software for in vivo volumetric dosimetry |
| |
| Affiliation: | 1. Physics Section, Radiotherapy Department, La Fe University and Polytechnic Hospital, E-46026 Valencia, Spain;2. National Dosimetry Centre, E-46009 Valencia, Spain;3. Radiotherapy Department, Hospital Clinica Benidorm, E-03501 Benidorm, Alicante, Spain;2. Medical Physics Department, Cumberland Infirmary, Carlisle, UK;3. Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, UK;1. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York;2. Department of Radiation Oncology, Columbia University, New York, New York;3. Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York;1. Faculty of Science and Information Technology, School of Mathematical and Physical Sciences, University of Newcastle, New South Wales, Australia;2. Faculty of Engineering and Built Environment, School of Electrical Engineering and Computer Science, University of Newcastle, New South Wales, Australia;3. Division of Medical Physics, CancerCare Manitoba, Winnipeg, Manitoba, Canada;4. Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada;5. Department of Radiation Oncology, Calvary Mater Newcastle Hospital, Newcastle, New South Wales, Australia |
| |
| Abstract: | Introduction and purposeDosimetry Check (DC) (Math Resolutions) is a commercial EPID-based dosimetry software, which allows performing pre-treatment and transit dosimetry. DC provides an independent verification of the treatment, being potentially of great interest due to the high benefits of the in vivo volumetric dosimetry, which guarantee the treatment delivery and anatomy constancy. The aim of this work is to study the differences in dose between DC and the Treatment Planning System (TPS) to establish an accuracy level of the system.Material and methodsDC v.3.8 was used along with Varian Clinac iX accelerator equipped with EPID aS1000 and Eclipse v.10.0 with AAA and Acuros XB calculation algorithms. The DC evaluated version is based on a pencil beam calculation algorithm. Various plans were generated over several homogeneous and heterogeneous phantoms. Isocentre point doses and gamma analysis were evaluated.ResultsTotal dose differences at the isocentre between DC and TPS for the studied plans are less than 2%, but single field contributions achieve greater values. In the presence of heterogeneities, the discrepancies can reach up to 15%. In transit mode, DC does not consider properly the couch attenuation, especially when there is an air gap between phantom and couch.ConclusionsThe possibility of this in vivo evaluation and the potentiality of this new system have a very positive impact on improving patient QA. But improvements are required in both calculation algorithm and integration with the record and verify system. |
| |
| Keywords: | Dosimetry check IMRT-VMAT verification Transit dosimetry |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
