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Photon scattering in biomedically important elements.

D A Bradley, A M Ghose

Physics in Medicine and Biology

|November 1, 1984

Summary

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This study reveals misrepresentations in how gamma radiation scattering ratios are applied in biomedical fields. Accurate analysis shows complex Z-element dependencies and suggests improved scattering models for applications like bone mineral measurement.

Area of Science:

Medical Physics
Biomedical Engineering
Materials Science

Background:

Coherent to incoherent scattering ratios of gamma radiation are used in biomedical applications.
Existing models often misrepresent the functional dependence of these scattering processes.

Purpose of the Study:

To analyze the accuracy of current models for gamma radiation scattering off low Z elements.
To identify key parameters for the coherent to incoherent scattering intensity ratio in biomedical contexts.
To suggest improvements for applications like bone mineral measurements.

Main Methods:

Analysis of tabulated coherent and incoherent scattering functions.
Evaluation of scattering models, including form factor and modified form factor approaches for Rayleigh scattering.

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Development of parametrical procedures for biomedical applications.

Main Results:

The explicit power dependence on atomic number (Z) is not easily expressed.
Rayleigh scattering is better represented by the modified form factor.
Identified key quantities and developed procedures for the scattering intensity ratio.

Conclusions:

Current models for gamma radiation scattering require refinement.
Improved models and understanding of scattering functions are crucial for accurate biomedical applications.
Future research should leverage advanced theoretical predictions for scattering cross-sections.