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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Color CT, literally.

Scott S Hsieh1

  • 1Dept. of Radiology, Mayo Clinic, Rochester, MN, USA 55902.

Proceedings of Spie--The International Society for Optical Engineering
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

This study explores using color-sensitive photodiodes for spectral X-ray imaging. While spectral performance is limited, this approach could enable widespread spectral CT adoption by only requiring silicon circuitry changes.

Keywords:
dual energy imagingdual layer CToptical transport

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Area of Science:

  • Medical Imaging
  • Photonics
  • Materials Science

Background:

  • Spectral CT is figuratively called 'color CT' due to X-ray energy bands.
  • Current detectors use energy-integrating photodiodes, lacking spectral information.
  • Gadolinium oxysulfide (GOS) scintillators emit light with spectral properties.

Purpose of the Study:

  • To literally investigate 'color CT' by using color-sensitive photodiodes.
  • To hypothesize that spectral optical imaging can measure spectral X-ray imaging.
  • To model the optical transport and spectral properties of GOS scintillators.

Main Methods:

  • Modeling optical transport of gadolinium oxysulfide (GOS) using datasheet information.
  • Analyzing light emission (green and red) and self-absorption properties of GOS.
  • Comparing a proposed color detector with conventional dual-layer detectors.

Main Results:

  • GOS emits green and red light, with preferential self-absorption of green light.
  • Lower energy X-rays may produce relatively more red photons reaching the photodiode due to shallower absorption depths.
  • The proposed color detector shows poorer spectral separation compared to dual-layer detectors, mainly due to the GOS K-edge.

Conclusions:

  • The proposed color-sensitive photodiode approach offers a path to spectral imaging with minimal hardware changes.
  • While spectral performance is currently limited, this method could be widely adopted due to its reliance on silicon circuitry modifications.
  • Future advancements may see color photodiodes replacing monochromatic diodes, making spectral CT imaging standard.