|
|||||
|
|
Sensitivity of a helical diode array dosimeter to Volumetric Modulated Arc Therapy delivery errors |
|
| Affiliation: | 1. Liverpool and Macarthur Cancer Therapy Centres and Ingham Institute, Sydney, NSW, Australia;2. Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia;3. South West Clinical School, University of New South Wales, Sydney, NSW, Australia;4. Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW, Australia;1. ICTEAM Institute, Université catholique de Louvain, Louvain-la-Neuve, Belgium;2. MIRO Lab., Université catholique de Louvain, Saint-Luc University Hospital, Brussels, Belgium;3. IBA s.a., Louvain-la-Neuve, Belgium;1. Department of Basic Sciences, College of Fisheries Engineering, Tamil Nadu Fisheries University, Nagapattinam 611001, India;2. Department of Chemistry, Kandasamy Kandar''s College, Salem 638182, India;3. Department of Chemistry, Dhirajlal Gandhi College of Technology, Salem 636 005, India;4. Department of Organic Materials & Fiber Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;5. Department of BIN Convergence Technology, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;6. Department of Biotechnology, Vels University, Chennai 600117, India |
| Abstract: | PurposeTo study the sensitivity of an ArcCHECK dosimeter in detecting delivery errors during the delivery of Volumetric Modulated Arc Therapy (VMAT).MethodsThree types of errors in Multi Leaf Collimator (MLC) position and dose delivery were simulated separately in the delivery of five prostate and five head and neck (H&N) VMAT plans: (i) Gantry independent: a systematic shift in MLC position and variation in output to the whole arc; (ii) Gantry dependent: sag in MLC position and output variation as a function of gantry angle; (iii) Control point specific MLC and output errors introduced to only a specific number of Control Points (CP). The difference in local and global gamma (γ) pass rate between the no-error and error-simulated measurements with 2%/2 mm and 3%/3 mm tolerances was calculated to assess the sensitivity of ArcCHECK. The clinical impact of these errors was also calculated.ResultsArcCHECK was able to detect a minimum 3 mm MLC error and 3% output error for Gantry independent errors using either local or global gamma with 2%/2 mm tolerance. For the Gantry dependent error scenario a minimum 3 mm MLC error and 3% dose error was identifiable by ArcCHECK using either global or local gamma with 2%/2 mm tolerance. In errors introduced to specific CPs a MLC error of 10 mm and dose error of 100% introduced to 4CPs were detected by ArcCHECK.ConclusionArcCHECK used with either local or global gamma analysis and 2%/2 mm criteria can be confidently used in the clinic to detect errors above the stated error values. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |