Monte Carlo simulation of photon transport within a hybrid grid-detector system for digital mammography

John M. Sabol, John M Boone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations


Screen-film and digital mammography typically utilize grids to remove scatter and a phosphor screen to convert the x- rays to light. We propose a square pore microchannel plate (SPMCP) hybrid grid-detector system that offers improvement in scatter rejection and quantum efficiency with acceptable resolution. SPMCP's are effective mammographic grids. Packing the exit side of the SPMCP with phosphor creates the hybrid system. The SPMCP confines the lateral spread of the emitted light and allows for a high efficiency phosphor layer. The hybrid system was investigated using Monte Carlo simulation of diffusive transport of optical photons. The size of the SPMCP pores, reflective coatings, scattering length within the phosphor, and phosphor thickness, were varied to maximize light output while maintaining resolution. The light output of the hybrid grid-detector systems is dependent upon the reflective properties of the SPMCP pores. WIth absorptive walls, the output increases with phosphor thickness, then decreases as absorption dominates. With reflective walls, the output is increased by 50 percent over the output of a conventional mammographic screen. Pore size and photon scattering length have minimal effect on light output. The MTF of a SPMCP detector is primarily dependent upon the size of the pores.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Number of pages9
StatePublished - 1997
EventMedical Imaging 1997: Physics of Medical Imaging - Newport Beach, CA, United States
Duration: Feb 23 1997Feb 23 1997


OtherMedical Imaging 1997: Physics of Medical Imaging
Country/TerritoryUnited States
CityNewport Beach, CA


  • Conversion efficiency
  • Digital imaging
  • Fiber optics
  • Mammography
  • Microchannel plate
  • Modulation transfer function
  • Monte Carlo
  • Phosphor
  • Photon diffusion

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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