https://sourceforge.net/p/astra-toolbox/wiki/Masks/Recent changes to MasksenTue, 02 Jul 2013 09:18:08 -0000https://sourceforge.net/p/astra-toolbox/wiki/Masks/<div class="markdown_content"><p>Various reconstruction algorithms support projection data and reconstruction<br /> volume masks. These behave as follows.</p> <p>The projection data elements corresponding to locations with SinogramMask<br /> value 0.0 will be ignored during the reconstruction. Similarly,<br /> the reconstruction data elements corresponding to locations with<br /> ReconstructionMask value 0.0 will be ignored during the reconstruction, and<br /> their values will be preserved. (Mostly, see note on constraints below.)</p> <p>The algorithm will behave as if the rows and columns corresponding to the<br /> masked voxels and projection data elements have been removed from the<br /> projection matrix entirely. In other words, it will iteratively try<br /> to match the projection of the non-masked voxels to the non-masked projection<br /> data elements.</p> <p>NB: MinConstraint/MaxConstraint will affect even masked voxels.</p></div>Willem Jan PalenstijnTue, 02 Jul 2013 09:18:08 -0000https://sourceforge.net9617a1c25c571876e2afa26b056ce34ec7a15f8c