title: Assessment of the dosimetric accuracies of CATPhan 504 and CIRS 062 using kV-CBCT for performing direct calculations.
abstract: The dosimetric accuracies of CATPhan 504 and CIRS 062 have been evaluated using the kV-CBCT of Varian TrueBeam linac and Eclipse TPS. The assessment was done using the kV-CBCT as a standalone tool for dosimetric calculations towards Adaptive replanning. Dosimetric calculations were made without altering the HU-ED curves of the planning computed tomography (CT) scanner that is used by the Eclipse TPS. All computations were done using the images and dataset from kV-CBCT while maintaining the HU-ED calibration curve of the planning CT (pCT), assuming pCT was used for the initial treatment plan. Results showed that the CIRS phantom produces doses within ±5% of the CT-based plan while CATPhan 504 produces a variation of ±14% of the CT-based plan.
authors.affiliation: Department of Medical Physics and Bioengineering, Malet Place Engineering Building, London, UK ; Health Physics and Instrumentation Center, Radiation Protection Institute, Ghana Atomic Energy Commission, Legon-Accra, Ghana.
authors.forename: James Kwame
authors.initials: JK
authors.lastname: Annkah
authors.affiliation: Department of Medical Physics and Bioengineering, Malet Place Engineering Building, London, UK ; Department of Radiotherapy Physics, University College London Hospital, London, UK.
authors.forename: Ivan
authors.initials: I
authors.lastname: Rosenberg
authors.affiliation: Department of Radiotherapy Physics, University College London Hospital, London, UK.
authors.forename: Naina
authors.initials: N
authors.lastname: Hindocha
authors.affiliation: Department of Medical Physics and Bioengineering, Malet Place Engineering Building, London, UK.
authors.forename: Syed Ali
authors.initials: SA
authors.lastname: Moinuddin
authors.affiliation: Department of Medical Physics and Bioengineering, Malet Place Engineering Building, London, UK.
authors.forename: Kate
authors.initials: K
authors.lastname: Ricketts
authors.affiliation: Department of Radiotherapy Physics, Royal Berkshire Hospital, Reading, UK.
authors.forename: Abiodun
authors.initials: A
authors.lastname: Adeyemi
authors.affiliation: Department of Medical Physics and Bioengineering, Malet Place Engineering Building, London, UK.
authors.forename: Gary
authors.initials: G
authors.lastname: Royle
keywords: Adaptive radiotherapy; adaptive replanning; cone beam CT; hounsfield units