Dose calculation accuracy of different image value to density tables for cone-beam CT planning in head & neck and pelvic localizations |
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| Institution: | 1. Department of Atomic, Molecular and Nuclear Physics, University of Valencia, E-46100 Burjassot, Spain;2. IFIC (UV-CSIC), Paterna, Spain;3. Department of Radiation Physics, ERESA, Hospital General Universitario, 46014 Valencia, Spain;4. Radiotherapy Department, Hospital Clinica Benidorm, 03501 Benidorm, Alicante, Spain;5. Physics Section, Radiotherapy Department, La Fe University and Polytechnic Hospital, 46009 Valencia, Spain;1. Department of Oral and Maxillofacial Surgery, University Hospitals of Oulu; Department of Oral and Maxillofacial Surgery, Southern General Hospital, Glasgow, United Kingdom;2. Department of Machine and Product Design, Faculty of Mechanical Engineering, Budapest University of Technology and Economics (BME), Budapest, Hungary;3. Centre for Medical Image Computing (CMIC), University College London, London, United Kingdom;4. Department of Human Morphology and Developmental Biology and Department of Anatomy, Histology and Developmental Biology, Semmelweis University, Budapest, Hungary;5. Department of Oral-Maxillofacial Surgery and Stomatology, Semmelweis University, Budapest, Hungary;6. Department of Mechatronics, Optics and Engineering Informatics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics (BME), Budapest, Hungary;7. Federal Institute of Education, Science, and Technology (IFBA), Salvador, Bahia, Brazil;8. Department of Machine and Product Design, Faculty of Mechanical Engineering, Budapest University of Technology and Economics (BME), Budapest, Hungary;9. Oral and Maxillofacial Surgery, University of Oulu; Biomeditech, Institute of Biomedical Technology, University of Tampere, Tampere, Finland;1. A. O. Ordine Mauriziano di Torino, Medical Physics Department, Torino, Italy;2. University of Naples Federico II, Dept. of Physics “Ettore Pancini” and INFN Division of Naples, Napoli, Italy |
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| Abstract: | PurposeWe aimed to identify the most accurate combination of phantom and protocol for image value to density table (IVDT) on volume-modulated arc therapy (VMAT) dose calculation based on kV-Cone-beam CT imaging, for head and neck (H&N) and pelvic localizations.MethodsThree phantoms (Catphan®600, CIRS®062M (inner phantom for head and outer phantom for body), and TomoTherapy® “Cheese” phantom) were used to create IVDT curves of CBCT systems with two different CBCT protocols (Standard-dose Head and Standard Pelvis). Hounsfield Unit (HU) time stability and repeatability for a single On-Board-Imager (OBI) and compatibility of two distinct devices were assessed with Catphan®600. Images from the anthropomorphic phantom CIRS ATOM® for both CT and CBCT modalities were used for VMAT dose calculation from different IVDT curves. Dosimetric indices from CT and CBCT imaging were compared.ResultsIVDT curves from CBCT images were highly different depending on phantom used (up to 1000 HU for high densities) and protocol applied (up to 200 HU for high densities). HU time stability was verified over seven weeks. A maximum difference of 3% on the dose calculation indices studied was found between CT and CBCT VMAT dose calculation across the two localizations using appropriate IVDT curves. One IVDT curve per localization can be established with a bi-monthly verification of IVDT-CBCT.ConclusionsThe IVDT-CBCTCIRS-Head phantom with the Standard-dose Head protocol was the most accurate combination for dose calculation on H&N CBCT images. For pelvic localizations, the IVDT-CBCTCheese established with the Standard Pelvis protocol provided the best accuracy. |
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| Keywords: | kV-CBCT IVDT curve Hounsfield units |
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