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Achieving accurate radiochromic optical-CT imaging when using a polychromatic light source.

A Thomas1, M Pierquet, M Oldham

  • 1Dept of Radiation Oncology, Duke University Medical Center, Durham, NC, USA.

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|February 4, 2011
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Summary

Optical-CT imaging using broad spectrum light can cause dose errors due to spectral warping. A new correction method shows polychromatic imaging can be as accurate as monochromatic imaging, potentially reducing artifacts.

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Dosimetry

Background:

  • Optical-CT imaging utilizes light to determine dose distributions.
  • Broad spectrum light sources can introduce spectral warping, affecting attenuation coefficient accuracy.
  • Spectral warping occurs as different wavelengths are differentially attenuated by radiochromic dosimeters.

Purpose of the Study:

  • To characterize the error in reconstructed attenuation coefficients caused by spectral warping in Optical-CT.
  • To develop and validate a correction method for spectral warping in polychromatic Optical-CT imaging.
  • To evaluate the potential benefits of polychromatic imaging over monochromatic imaging, including artifact reduction.

Main Methods:

  • Simulations were performed to model a typical radiochromic dosimeter and a 2 Gy irradiation scenario.
  • Reconstructed attenuation coefficients from polychromatic scans were compared to those from monochromatic scans.
  • A novel correction method was developed and applied to the simulated polychromatic data.

Main Results:

  • Simulations indicated that reconstructed attenuation coefficients could be in error by over 12% compared to monochromatic scans.
  • Preliminary data suggests the developed correction method significantly improves accuracy.
  • Corrected polychromatic imaging results were comparable in accuracy to monochromatic imaging.

Conclusions:

  • Spectral warping is a significant source of error in polychromatic Optical-CT dose reconstruction.
  • The proposed correction method effectively mitigates spectral warping errors.
  • Polychromatic Optical-CT imaging, when corrected, offers comparable accuracy to monochromatic imaging and may reduce scattering artifacts.