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-Computed Tomography is a technique for estimating the interior of an object
-from measurement of radiation collected around the object. This radiation
-can be either projected through or emitted from the object.
-\rtfsp\ctsim simulates the process of projecting X-rays through a phantom object.
-\rtfsp\ctsim can then reconstruct the interior of the object from the projections
-collected around the phantom object.