IMAGE RECONSTRUCTION FROM HESSI PHOTON LISTS

PHOTON LISTS

• WHY MAKE HESSI SCORES? (.ps)
• 900-PHOTON SCORE (.ps)
• PHOTON LIST RECIPE (.ps)
• ALGORITHM DIAGRAM (.ps)
• BINNED PHOTON PROFILE, COLLIMATORS 1-4
• BINNED PHOTON PROFILE, COLLIMATORS 6-9

BACK PROJECTIONS

• Unbinned Back Projection (Caption) (.ps)
• Unbinned Back Projection maps 0-8 (.ps)
• Back Projection HOW-TO (.ps)
• Back-Projection Artifacts (.ps)

CHI SQUARE AND ALL THAT

• Comparing the Model with the Score (.ps)
• CHI-SQ for Sparse Photons (.ps)
• Unbinned Back Projection maps 0-8 (.ps)

MAXIMUM ENTROPY

• Max Ent Algorithm (.ps)
• HOW-TO MEM (.ps)
• The Gradient Map (.ps)

CONCLUSIONS

• Photon lists must be developed to include:
  • More complex and realistic sources
  • Time variability
  • Internal shadowing and vignetting
  • Grid irregularities
  • Pulse height spectra
  • Aspect Phase Information

• Maximum Entropy Programs must be made:
  • More robust
  • Faster
  • More efficient

• Other Reconstruction Algorithms are needed:
  • CLEAN
  • Maximum Likelyhood
  • Signal Processing

Last updated JUNE 2, 1998.