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Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom.

Publication ,  Journal Article
Sakhalkar, H; Sterling, D; Adamovics, J; Ibbott, G; Oldham, M
Published in: J Phys Conf Ser
2009

An urgent requirement for 3D dosimetry has been recognized because of high failure rate (~25%) in RPC credentialing, which relies on point and 2D dose measurements. Comprehensive 3D dosimetry is likely to resolve more errors and improve IMRT quality assurance. This work presents an investigation of the feasibility of PRESAGE/optical-CT 3D dosimetry in the Radiologic Physics Center (RPC) IMRT H&N phantom. The RPC H&N phantom (with standard and PRESAGE dosimetry inserts alternately) was irradiated with the same IMRT plan. The TLD and EBT film measurement data from standard insert irradiation was provided by RPC. The 3D dose measurement data from PRESAGE insert irradiation was readout using the OCTOPUS™ 5X optical-CT scanner at Duke. TLD, EBT and PRESAGE dose measurements were inter-compared with Eclipse calculations to evaluate consistency of planning and delivery. Results showed that the TLD point dose measurements agreed with Eclipse calculations to within 5% dose-difference. Relative dose comparison between Eclipse dose, EBT dose and PRESAGE dose was conducted using profiles and gamma comparisons (4% dose-difference and 4 mm distance-to-agreement). Profiles showed good agreement between measurement and calculation except along steep dose gradient regions where Eclipse modelling might be inaccurate. Gamma comparisons showed that the measurement and calculation showed good agreement (>96%) if edge artefacts in measurements are ignored. In conclusion, the PRESAGE/optical-CT dosimetry system was found to be feasible as an independent dosimetry tool in the RPC IMRT H&N phantom.

Duke Scholars

Published In

J Phys Conf Ser

DOI

ISSN

1742-6588

Publication Date

2009

Volume

164

Issue

2009

Start / End Page

12058

Location

England

Related Subject Headings

  • 51 Physical sciences
  • 0299 Other Physical Sciences
  • 0204 Condensed Matter Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Sakhalkar, H., Sterling, D., Adamovics, J., Ibbott, G., & Oldham, M. (2009). Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom. J Phys Conf Ser, 164(2009), 12058. https://doi.org/10.1088/1742-6596/164/1/012058
Sakhalkar, Hs, D. Sterling, J. Adamovics, G. Ibbott, and M. Oldham. “Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom.J Phys Conf Ser 164, no. 2009 (2009): 12058. https://doi.org/10.1088/1742-6596/164/1/012058.
Sakhalkar H, Sterling D, Adamovics J, Ibbott G, Oldham M. Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom. J Phys Conf Ser. 2009;164(2009):12058.
Sakhalkar, Hs, et al. “Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom.J Phys Conf Ser, vol. 164, no. 2009, 2009, p. 12058. Pubmed, doi:10.1088/1742-6596/164/1/012058.
Sakhalkar H, Sterling D, Adamovics J, Ibbott G, Oldham M. Investigating the Feasibility of 3D Dosimetry in the RPC IMRT H&N Phantom. J Phys Conf Ser. 2009;164(2009):12058.
Journal cover image

Published In

J Phys Conf Ser

DOI

ISSN

1742-6588

Publication Date

2009

Volume

164

Issue

2009

Start / End Page

12058

Location

England

Related Subject Headings

  • 51 Physical sciences
  • 0299 Other Physical Sciences
  • 0204 Condensed Matter Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics