1 January 1986 Limited-Angle, 3D Density Reconstruction By Gradient Methods
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Steepest descent (SD) and conjugate gradient (CG) methods have been applied to limited-angle, 3D density reconstructions of longitudinal, circular tomography. Both variable and constant stepsize have been considered with and without positivity constraint. Simulational as well as clinical studies are reported. From the simulation studies, CG with constant steplength and with positivty constraint is found to be most effective.
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D. N. Ghosh Roy, D. N. Ghosh Roy, L. D. Waters, L. D. Waters, G. T. Gullberg, G. T. Gullberg, R. A. Kruger, R. A. Kruger, } "Limited-Angle, 3D Density Reconstruction By Gradient Methods", Proc. SPIE 0671, Physics and Engineering of Computerized Multidimensional Imaging and Processing, (1 January 1986); doi: 10.1117/12.966678; https://doi.org/10.1117/12.966678

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