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Tomographic image reconstruction is often formulated as a regularized weighted least squares (RWLS) problem optimized by iterative algorithms that are either inherently algebraic or derived from a statistical point of view. This paper compares a modified version of simultaneous iterative reconstruction technique (SIRT), which is of the former type, with a version of separable quadratic surrogates...
Traditional SPECT imaging requires a trade-off between resolution and sensitivity. We show that it is possible to eliminate this trade-off and come close to achieving both goals simultaneously. Abstractly, small pinhole data is used to improve the resolution of co-registered large pinhole data which has higher sensitivity. Mathematically, the former is used to initialize a set of line processes that...
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