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We propose nonlocal-means (NLM) approaches to incorporating prior anatomical information into PET image reconstruction. In our NLM approaches, adaptive smoothing is performed on the PET image by using the weights that reflect the self-similarity property of the underlying PET image with the aid of the additional information obtained from the anatomical image. Unlike conventional anatomy-based reconstruction...
We propose GPU (graphics processing unit) accelerated methods that can dramatically improve the computational performance of statistical image reconstruction algorithms for Compton cameras. Since the conventional ray-based backprojection method is inefficient for GPU, we develop a fully voxel-based backprojection method which can maximize the performance of GPU. In this method, the cone surface is...
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