A fast, high spatial resolution optical tomographic scanner for measurement of absorption in gel dosimetry

  • T. van Doorn
  • M. Bhat
  • T. P. Rutten
  • T. Tran
  • A. Costanzo
Scientific Papers

DOI: 10.1007/BF03178697

Cite this article as:
van Doorn, T., Bhat, M., Rutten, T.P. et al. Australas. Phys. Eng. Sci. Med. (2005) 28: 76. doi:10.1007/BF03178697

Abstract

A fast tomographic optical density measurement system has been constructed and evaluated for application in Fricke 3D gel dosimetry. Although the potential for full three-dimensional radiation dosimetry with Fricke gel dosimeters has been extensively reported, its application has been limited due to a lack of fast optical density measurement systems. In this work, the emphasis of the design has been to achieve a short scan time through the use of precision optics and minimal moving parts. The system has been demonstrated in the laboratory to be able to achieve better than 1mm resolution and a scanning time per tomographic slice of 2.4 seconds. Full volumetric sampling of a 10 cm diameter by 7cm long cylinder can be achieved in 3 minutes. When applied with a Fricke based gel dosimeter a linear response between reconstructed CT number and absolute dose was better than 3%.

Key words

gel dosimetry optical CT 3D dosimetry FBX dosimeter conformal radiotherapy 

Copyright information

© Australasian College of Physical Scientists and Engineers in Medicine 2005

Authors and Affiliations

  • T. van Doorn
    • 1
    • 2
  • M. Bhat
    • 1
    • 2
  • T. P. Rutten
    • 2
  • T. Tran
    • 2
  • A. Costanzo
    • 2
  1. 1.Department of Medical Physics, Cancer CentreRoyal Adelaide HospitalAustralia
  2. 2.School of Chemistry and PhysicsUniversity of AdelaideAdelaideAustralia

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