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SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry.

Publication ,  Journal Article
Bache, S; Malcolm, J; Adamovics, J; Oldham, M
Published in: Med Phys
June 2014

PURPOSE: To characterize and explore the efficacy of a novel low-cost, lowfluid, broad-beam optical-CT system for 3D-dosimetry in radiochromic Presage dosimeters. Leading current optical-CT systems incorporate expensive glass-based telecentric lens technology, and a fluid bath with substantial amounts of fluid (which introduces an inconvenience factor) to minimize refraction artifacts. Here we introduce a novel system which addresses both these limitations by: (1) the use of Fresnel lenses in a telecentric arrangement, and (2) a 'solid' fluid bath which dramatically reduces the amount of fluid required for refractive-index (RI) matching. Materials METHODS: A fresnel based telecentric optical-CT system was constructed which expands light from a single red LED source into a nominally parallel beam into which a cubic 'dry-tank' is placed. The drytank consists of a solid polyurethane cube (with the same RI as Presage) but containing a cylindrical cavity (11.5cm diameter × 11cm) into which the dosimeter is placed for imaging. A narrow (1-3mm) gap between the walls of the dosimeter and dry-tank is filled with a fluid of similar RI. This arrangement reduces the amount of RI fluid from about 1000cc to 75cc, yielding substantial practical benefit in convenience and cost. The new system was evaluated in direct comparison against Eclipse planning system from a 4-field parallel-opposed treatmen RESULTS: Gamma calculations of dose from DFOS-dry system versus Eclipse showed 92% and 97% agreement with 4mm/4% and 5mm/5% criteria, respectively, in the central 80% of dose distribution. Reconstructions showed some edge artifacts, as well as some dose underestimation towards the dosimeter edge. CONCLUSION: The implementation of Fresnel based 'dry' optical-CT for 3Ddosimetry would represent an important advance enhancing costeffectiveness and practical viability. The performance of the prototype presented here is not yet comparable to the state-of-the-art, but shows sufficient promise for further investigation to elevate image quality to match gold-standard optical-CT systems. This work was supported by NIH R01CA100835.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

June 2014

Volume

41

Issue

6

Start / End Page

194

Location

United States

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Bache, S., Malcolm, J., Adamovics, J., & Oldham, M. (2014). SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry. Med Phys, 41(6), 194. https://doi.org/10.1118/1.4888217
Bache, S., J. Malcolm, J. Adamovics, and M. Oldham. “SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry.Med Phys 41, no. 6 (June 2014): 194. https://doi.org/10.1118/1.4888217.
Bache S, Malcolm J, Adamovics J, Oldham M. SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry. Med Phys. 2014 Jun;41(6):194.
Bache, S., et al. “SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry.Med Phys, vol. 41, no. 6, June 2014, p. 194. Pubmed, doi:10.1118/1.4888217.
Bache S, Malcolm J, Adamovics J, Oldham M. SU-E-J-164: An Investigation of a Low-Cost 'dry' Optical-CT Scanning System for 3D Dosimetry. Med Phys. 2014 Jun;41(6):194.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

June 2014

Volume

41

Issue

6

Start / End Page

194

Location

United States

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences