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Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid

Publication ,  Conference
Bache, S; Malcolm, J; Adamovics, J; Oldham, M
Published in: Journal of Physics: Conference Series
January 1, 2015

Optical computed tomography (optical-CT) is a method for visualizing 3dimensional dose distributions in radiochromic dosimeters. Projection images are acquired by collimating a visible light point source into parallel-beam geometry and imaging differential absorption through the sample dosimeter. Practical challenges involved in optical-CT imaging were addressed through the investigation of an in-house Fresnel-based optical-CT system with considerably less refractive index-matching fluid. The "DFOS" (Duke Fresnel-based Optical- CT System) system differed from current optical-CT systems by replacing cumbersome convex telecentric lenses with a lighter and much less expensive Fresnel system. A second major modification was the replacement of the refractive index-matching fluid bath with a solid polyurethane tank. PRESAGE radiochromic dosimeters were irradiated with orthogonal parallel-opposed treatments and dose distributions were readout by the DFOS system and compared to both treatment planning software prediction and two other in-house optical-CT systems. Gamma index passing rate at the 3%/3mm threshold in relation to Eclipse treatment planning software for the treatment was 92.2%%, compared to 96.8% and 95.6% for two other systems featuring a traditional setup. The DFOS system showed promise for 3D dosimetry, but the performance is still substantially inferior at present to the gold-standard systems.

Duke Scholars

Published In

Journal of Physics: Conference Series

DOI

EISSN

1742-6596

ISSN

1742-6588

Publication Date

January 1, 2015

Volume

573

Issue

1

Related Subject Headings

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

Citation

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Bache, S., Malcolm, J., Adamovics, J., & Oldham, M. (2015). Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid. In Journal of Physics: Conference Series (Vol. 573). https://doi.org/10.1088/1742-6596/573/1/012052
Bache, S., J. Malcolm, J. Adamovics, and M. Oldham. “Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid.” In Journal of Physics: Conference Series, Vol. 573, 2015. https://doi.org/10.1088/1742-6596/573/1/012052.
Bache S, Malcolm J, Adamovics J, Oldham M. Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid. In: Journal of Physics: Conference Series. 2015.
Bache, S., et al. “Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid.” Journal of Physics: Conference Series, vol. 573, no. 1, 2015. Scopus, doi:10.1088/1742-6596/573/1/012052.
Bache S, Malcolm J, Adamovics J, Oldham M. Investigation of a low-cost optical-CT system with minimal refractive index-matching fluid. Journal of Physics: Conference Series. 2015.
Journal cover image

Published In

Journal of Physics: Conference Series

DOI

EISSN

1742-6596

ISSN

1742-6588

Publication Date

January 1, 2015

Volume

573

Issue

1

Related Subject Headings

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