Journal of Medical Physics (Jan 2014)

Assessment of the dosimetric accuracies of CATPhan 504 and CIRS 062 using kV-CBCT for performing direct calculations

  • James Kwame Annkah,
  • Ivan Rosenberg,
  • Naina Hindocha,
  • Syed Ali Moinuddin,
  • Kate Ricketts,
  • Abiodun Adeyemi,
  • Gary Royle

DOI
https://doi.org/10.4103/0971-6203.139001
Journal volume & issue
Vol. 39, no. 3
pp. 133 – 141

Abstract

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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.

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