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Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems

Publication ,  Journal Article
Wang, H; Jaszczak, RJ; Gilland, DR; Greer, KL; Coleman, RE
Published in: IEEE Transactions on Nuclear Science
August 1, 1993

A solid geometry based approach is used to model non-uniform attenuation and Compton scattering in irregularly shaped objects for Monte Carlo simulated single photon emission computed tomography (SPECT) imaging systems. The shape of an object is described by a combination of object primitives: ellipsoids, elliptical cylinders, tapered elliptical cylinders, rectangular solids, and their halves, quarters, and eighths, based on set union, intersection, and difference. The primitives are then assigned density and energy-dependent photoelectric and Compton cross sections. This approach is validated in two steps. Firstly, only non-uniform attenuation is included. The transaxial images of a simulated thorax phantom are reconstructed using a modified Chang's technique for nonuniform attenuation. Secondly, detected Compton scattering is added to the model. Scatter fraction of a point source in a water cylinder is used to validate our scatter model for uniform scattering media. The difference between simulated and experimental results is on the order of 10%. For the model of nonuniform attenuation and detected Compton scattering, a thorax phantom is used for validation. Normalized profiles across the center of the sphere projections for simulation and experiment are observed to have insignificant difference. These results validate our object modelling approach for nonuniform attenuation and Compton scattering. The performance of the solid model is demonstrated to be faster and require substantially less parameter storage than a voxel based model.

Duke Scholars

Published In

IEEE Transactions on Nuclear Science

DOI

ISSN

0018-9499

Publication Date

August 1, 1993

Volume

40

Issue

4

Related Subject Headings

  • Nuclear & Particles Physics
  • 5106 Nuclear and plasma physics
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Wang, H., Jaszczak, R. J., Gilland, D. R., Greer, K. L., & Coleman, R. E. (1993). Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems. IEEE Transactions on Nuclear Science, 40(4). https://doi.org/10.1109/23.256569
Wang, H., R. J. Jaszczak, D. R. Gilland, K. L. Greer, and R. E. Coleman. “Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems.” IEEE Transactions on Nuclear Science 40, no. 4 (August 1, 1993). https://doi.org/10.1109/23.256569.
Wang H, Jaszczak RJ, Gilland DR, Greer KL, Coleman RE. Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems. IEEE Transactions on Nuclear Science. 1993 Aug 1;40(4).
Wang, H., et al. “Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems.” IEEE Transactions on Nuclear Science, vol. 40, no. 4, Aug. 1993. Scopus, doi:10.1109/23.256569.
Wang H, Jaszczak RJ, Gilland DR, Greer KL, Coleman RE. Solid geometry based modelling of non-uniform attenuation and Compton scattering in objects for SPECT imaging systems. IEEE Transactions on Nuclear Science. 1993 Aug 1;40(4).

Published In

IEEE Transactions on Nuclear Science

DOI

ISSN

0018-9499

Publication Date

August 1, 1993

Volume

40

Issue

4

Related Subject Headings

  • Nuclear & Particles Physics
  • 5106 Nuclear and plasma physics
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics