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In this paper we develop a theory of visualizing a parallel execution by the entropy of the phase space induced by its traces. This metric is then shown to be able to both theoretically and practically find program issues, such as starvation due to data in one of its threads.
Iterative algorithms such as ART, DROP, and CARP are commonly used in reconstructing computed tomography images, but only account for errors in the measurements. Errors in the predicted path and intersection lengths, or even blocks of missing measurements can result in degraded image quality. Robust techniques allow for errors in other areas of the model and produce good images that show less sensitivity...
This paper considers how to determine the boundary of an object by comparing two methods: space carving (SC) and filtered back-projection (FBP). Determination of the boundary is an important first step in proton CT. The boundary is used to set up the large sparse linear system of equations, which are then solved to determine the relative stopping power of each element (voxel) in the object. For instance,...
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