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Using a Mask to Decrease Computation Time for SpatialObject to Image Conversions

Mueller, Dan
Philips Healthcare
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Published in The Insight Journal - 2006 July - December.
Submitted by Dan Mueller on 2006-07-22T21:44:38Z.

This article presents an approach for decreasing the computational time for converting a sparse SpatialObject to an Image. The method is applicable for SpatialObjects which occupy less volume than the total output Image (which occurs often, especially when using TubeSpatialObjects to represent vessels). A new filter MaskedSpatialObjectToImageFilter is introduced which dramatically decreases the execution time by creating a mask of relevant pixels. The mask is computed by calling the conventional SpatialObjectToImageFilter at a lower resolution, which is significantly faster for large images. The mask is then up-sampled to control which areas are further processed.