Abstract
Images of the inside of the human body can be obtained noninvasively using tomographic acquisition and processing techniques. In particular, these techniques are commonly used to obtain images of a γ-emitter distribution after its administration in the human body. The reconstructed images are obtained given a set of their projections, acquired using rotating gamma cameras. A general overview of analytic and iterative methods of reconstruction in SPECT is presented with a special focus on filter backprojection (FBP), conjugate gradient, maximum likelihood expectation maximization, and maximum a posteriori expectation maximization algorithms. The FBP algorithm is faster than iterative algorithms, with the latter providing a framework for accurately modeling the emission and detection processes.
Footnotes
Received Jan. 14, 2002; revision accepted Jun. 10, 2002.
For correspondence or reprints contact: Philippe P. Bruyant, PhD, Division of Nuclear Medicine, University of Massachusetts Medical School, 55 Lake Ave. N., Worcester, MA 01655.
E-mail: Philippe.Bruyant{at}umassmed.edu
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