Implementation of a pretreatment quality assurance (QA) system needs a strong validation process and a good comprehension of the tool. The aim of this study is to validate COMPASS (IBA Dosimetry, Germany) as our 3D pre- treatment QA tool for system of Pinnacle as treatment planning system and an ELEKTA synergy linear accelerator. Validation of the systems was performed with static and dynamic plans on AAPM TG-119 phantom and 10 real VMAT plans for prostate and head and neck. Comparison between point dose from TPS and COMPASS was performed to evaluate the confidence limit in high dose region (98.5% and 98.6%) and low dose region (94.1% and 95.2%) for COMPASS computed and reconstructed dose respectively. For planar dose the confidence limit was respectively 95.37% and 96.35% for COMPASS computed and reconstructed dose. Clinical validation was evaluated by comparing dose-volume parameters for real VMAT plans with TPS values (mean differences were below of 1% for the target). The comparison between 2D dose distribution from TPS and dose extracted from COMPASS computed and reconstructed for real VMAT plans were also performed (mean global gamma passing rate better than 94% and 98% for the 2%/2mm and 3%/3mm criteria). The 3D dose distribution comparison between TPS and COMPASS was also performed with good gamma score for global and local analysis. COMPASS was successfully evaluated as our 3D pretreatment system.
Cite this paper
Zamo, C. F. D. and Moyo, M. N. (2021). Validation of a 3D Pretreatment Quality Assurance Tool for Volumetric Modulated Arc Therapy (VMAT). Open Access Library Journal, 8, e7434. doi: http://dx.doi.org/10.4236/oalib.1107434.
Bedford, J., Lee, Y., Wai, P., South, C. and Warrington, A. (2009) Evaluation of the Delta4 phantom for IMRT and VMAT Verification. Physics in Medicine & Biology, 54, N167-N176. https://doi.org/10.1088/0031-9155/54/9/N04
Bouchard, H. and Seuntjens, J. (2004) Ionization Chamber-Based Reference Dosimetry of Intensity Modulated Radiation Beams. Medical Physics, 31, 2454-2465.
https://doi.org/10.1118/1.1781333
Boggula, R., Birkner, M., Lohr, F., Steil, V., Wenz, F. and Wertz, H. (2011) Evaluation of a 2D Detector Array for Patient-Specific VMAT QA with Different Setups. Physics in Medicine & Biology, 56, 7163-7177.
https://doi.org/10.1088/0031-9155/56/22/011
Dobler, B., Streck, N., Klein, E., Loeschel, R., Haerti, P. and Koelbl, O. (2010) Hybrid Plan Verification for Intensity-Moduated Radiation Therapy (IMRT) Using the 2D Ionization Chamber Array I’mRT MatriXX—A Feasibility Study. Physics in Medicine & Biology, 55, N39-N55. https://doi.org/10.1088/0031-9155/55/2/N02
Boggula, R., Lorenz, F., Mueller, L., Birkner, M., Wertz, H., Stieler, F., et al. (2010) Experimental Validation of a Commercial 3D Dose Verification System for Intensity-Modulated Arc Therapies. Physics in Medicine & Biology, 55, 5619-5633.
https://doi.org/10.1088/0031-9155/55/19/001
Swamy, S.T., Anuradha, C., Kathirvel, M., Arun, G. and Subramanian, S. (2014) Pretreatment Quality Assurance of Volumetric Modulated Arc Therapy on Patient CT Scan Using Indirect 3D Dosimetry System. International Journal of Cancer Therapy and Oncology, 2, Article ID: 020416. http://doi.org/10.14319/ijcto.0204.16
Clemente-Gutiérrez, F. and Pérez-Vara, C. (2015) Dosimetric Validation and Clinical Implementation of Two 3D Dose Verification Systems for Quality Assurance in Volumetric-Modulated arc Therapy Techniques. Journal of Applied Clinical Medical Physics, 16, 198-217. https://doi.org/10.1120/jacmp.v16i2.5190
Cosgrove, V.P., Thomas, M.D.R., Weston, S.J., Thompson, M.G., Reynaert, N., Evans, C.J., et al. (2009) Physical Characterization of a New Design of an ELekta Radiation Head with Integrated 160-Leaf Multileaf Collimator. International Journal of Radiation Oncology, Biology, Physics, 75, S722-S723.
https://doi.org/10.1016/j.ijrobp.2009.07.1646
Bedford, J.L., Childs, P.J., Nordmark Hansen, V., Mosleh-Shirazi, M.A., Verhaegen, F. and Warrington, A.P. (2003) Commissioning and Quality Assurance of the Pinnacle Radiotherapy Treatment Planning System for External Beam Photons. British Journal of Radiology, 76, 163-176. https://doi.org/10.1259/bjr/42085182
Bedford, J.L., Thomas, M.D.R. and Smyth, G. (2013) Beam Modeling and VMAT Performance with the Agility 160-Leaf Multileaf Collimator. Journal of Applied Clinical Medical Physics, 14, 172-185. https://doi.org/10.1120/jacmp.v14i2.4136
Ezzell, G.A., Galvin, J.M., Low, D., Palta, J.R., Rosen, I., Sharpe, M.B., et al. (2003) Guidance Document on Delivery, Treatment Planning, and Clinical Implementation of IMRT: Report of the IMRT Subcommittee of the AAPM Radiation Therapy Committee. Medical Physics, 30, 2089-2115. https://doi.org/10.1118/1.1591194
Cadman, P., McNutt, T.R. and Bzdusek, K. (2005) Validation of Physics Improvements for IMRT with a Commercial Treatment Planning System. Journal of Applied Clinical Medical Physics, 6, 74-86. https://doi.org/10.1120/jacmp.v6i2.2083
Nelms, B., Chan, M., Jarry, G., Lemire, M., Lowden, J., Hampton, C., et al. (2013) Evaluating IMRT and VMAT Dose Accuracy: Practical Examples of Failure to Detect Systematic Errors When Applying a Commonly Used Metric and Action Levels. Medical Physics, 40, Article ID: 111722. https://doi.org/10.1118/1.4826166
