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Alexander K, Percy E, Olding T, et al. Poster - Thur Eve - 18: Characterization of a camera and LED lightbox imaging system for radiochromic film dosimetry. Med Phys. 2012;39(7):4627doi: 10.1118/1.4740126.
Alexander, K., Percy, E., Olding, T., Schreiner, L. J., & Salomons, G. (2012). Poster - Thur Eve - 18: Characterization of a camera and LED lightbox imaging system for radiochromic film dosimetry. Medical physics, 39(7), 4627. https://doi.org/10.1118/1.4740126
Alexander, K, et al. "Poster - Thur Eve - 18: Characterization of a camera and LED lightbox imaging system for radiochromic film dosimetry." Medical physics vol. 39,7 (2012): 4627. doi: https://doi.org/10.1118/1.4740126
Alexander K, Percy E, Olding T, Schreiner LJ, Salomons G. Poster - Thur Eve - 18: Characterization of a camera and LED lightbox imaging system for radiochromic film dosimetry. Med Phys. 2012 Jul;39(7):4627. doi: 10.1118/1.4740126. PMID: 28516720.
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Med Phys. 2012 Jul;39(7):4627. doi: 10.1118/1.4740126.

Poster - Thur Eve - 18: Characterization of a camera and LED lightbox imaging system for radiochromic film dosimetry.

Medical physics

K Alexander, E Percy, T Olding, L J Schreiner, G Salomons

Affiliations

  1. Department of Physics, Queen's University, Kingston, Ontario.
  2. Medical Physics Department, Cancer Centre of Southeastern Ontario, Kingston, Ontario.
  3. Department of Oncology, Queen's University, Kingston, Ontario.

PMID: 28516720 DOI: 10.1118/1.4740126

Abstract

Radiation therapy treatment modalities continue to develop and have become increasingly complex. With this, dose verification and quality assurance (QA) is of great importance to ensure that a prescribed dose is accurately and precisely delivered to a patient. Radiochromic film dosimetry has been adopted as a convenient option for QA, because it is relatively energy independent, is near tissue equivalent, and has high spatial resolution. Unfortunately, it is not always easy to use. In this study, preliminary work towards developing a novel method of imaging radiochromic film is presented. The setup consists of a camera mounted vertically above a lightbox containing red LEDs, interfaced with computer image acquisition software. Imaging results from this system will be compared with imaging performed using an Epson Expression 10000XL scanner (a device in common clinical use). The lightbox imaging technique with camera readout is much faster relative to a flatbed scanner. The film measurements made using the camera are independent of film orientation, and show reduced artifacts, so that there are fewer corrections required compared to the use of flatbed scanners. Optical scatter also appears to be less of an issue with this design than with the flat bed scanner. While further work needs to be done to optimize the lightbox imaging system, the lightbox system shows great promise for a rapid, simple, and orientation independent setup, improving on existing film scanning systems.

© 2012 American Association of Physicists in Medicine.

Keywords: Cameras; Computer software; Dosimetry; Image scanners; Light emitting diodes; Medical imaging; Quality assurance; Radiation therapy; Radiation treatment; Tissues

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