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Title: Iterative optimizing quantization method for reconstructing three-dimensional images from a limited number of views

A three-dimensional image reconstruction method comprises treating the object of interest as a group of elements with a size that is determined by the resolution of the projection data, e.g., as determined by the size of each pixel. One of the projections is used as a reference projection. A fictitious object is arbitrarily defined that is constrained by such reference projection. The method modifies the known structure of the fictitious object by comparing and optimizing its four projections to those of the unknown structure of the real object and continues to iterate until the optimization is limited by the residual sum of background noise. The method is composed of several sub-processes that acquire four projections from the real data and the fictitious object: generate an arbitrary distribution to define the fictitious object, optimize the four projections, generate a new distribution for the fictitious object, and enhance the reconstructed image. The sub-process for the acquisition of the four projections from the input real data is simply the function of acquiring the four projections from the data of the transmitted intensity. The transmitted intensity represents the density distribution, that is, the distribution of absorption coefficients through the object.
Inventors:
 [1]
  1. (Dublin, CA)
Issue Date:
OSTI Identifier:
871242
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5689629
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
iterative; optimizing; quantization; method; reconstructing; three-dimensional; images; limited; views; image; reconstruction; comprises; treating; elements; size; determined; resolution; projection; data; pixel; projections; reference; fictitious; arbitrarily; defined; constrained; modifies; structure; comparing; continues; iterate; optimization; residual; background; noise; composed; sub-processes; acquire; generate; arbitrary; distribution; define; optimize; enhance; reconstructed; sub-process; acquisition; input; simply; function; acquiring; transmitted; intensity; represents; density; absorption; coefficients; three-dimensional images; method comprises; transmitted intensity; absorption coefficient; density distribution; background noise; method comprise; comprises treating; reconstructed image; image reconstruction; dimensional image; three-dimensional image; dimensional images; /345/