A generalised algorithm for spectral reconstruction in Compton spectroscopy with corrections for coherent scattering.

Area of Science:

• Medical physics
• Spectroscopy
• Radiological imaging

Background:

• Compton spectrometers reconstruct primary photon energy spectra from pulse-height distributions.
• Previous algorithms assumed negligible coherent scattering, valid for X-ray units 40-150 kV.
• Mammography and dental radiography involve low-energy photons (<30 keV) where coherent scattering is significant.

Purpose of the Study:

• To extend Compton spectrometer algorithms to account for significant coherent scattering.
• To improve the accuracy of primary photon energy spectrum reconstruction in low-energy X-ray applications.
• To validate the enhanced algorithm's performance for spectral measurements down to a few keV.

Main Methods:

• Developed an extended algorithm incorporating coherent scattering as a perturbation calculation.
• Modified the Klein-Nishina scattering cross-section to represent the total scattering cross-section.
• Compared reconstructed energy spectra with measurements from the primary beam.

Main Results:

• The extended algorithm successfully accounts for the significant contribution of coherent scattering.
• The Compton spectrometer with the enhanced algorithm accurately measures energy spectra.
• Effective spectral measurements were achieved down to a few keV.

Conclusions:

• The enhanced Compton spectrometer algorithm is crucial for accurate spectral analysis in mammography and dental radiography.
• This method provides a reliable tool for measuring low-energy photon spectra.
• The improved technique enhances diagnostic capabilities in specific radiological fields.