Point Source Scatter Contributions From Finite Size Objects In Radioisotope Imaging

J. A. Bieszk; C. B. Lim

doi:10.1117/12.934490

1 November 1982 Point Source Scatter Contributions From Finite Size Objects In Radioisotope Imaging

J. A. Bieszk, C. B. Lim

Proceedings Volume 0372, Physics and Engineering in Medical Imaging; (1982) https://doi.org/10.1117/12.934490
Event: International Workshop on Physics and Engineering in Medical Imaging, 1982, Pacific Grove, United States

Abstract

A Monte Carlo simulation was developed to study scatter contributions from a 140 keV point source at various depths and for different energy windows in finite water phantoms. Photoelectric and Compton interactions were considered. Scatter fractions, energy spectra, and radial spread functions of three approximately patientsized phantoms (rectangular prism, elliptical cylinder, and a sphere) were examined as a function of point-source depth and detector energy-window width. For a 100% energy window, energy spectra are characterized by a high energy region, a backscatter peak region, and a low energy, multi-scatter region. Depth dependent spatial limitations to the radial spread functions occur with decreasing window width. Scatter fractions for the sphere are much smaller than those of the other two phantoms, but approach their values as the size of the energy window decreases.

Citation Download Citation

J. A. Bieszk and C. B. Lim "Point Source Scatter Contributions From Finite Size Objects In Radioisotope Imaging", Proc. SPIE 0372, Physics and Engineering in Medical Imaging, (1 November 1982); https://doi.org/10.1117/12.934490

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