Iterative reconstruction of image data in CT
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United States of America Patent
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Mar 21, 2017
Grant Date -
Aug 6, 2015
app pub date -
Feb 5, 2014
filing date -
Feb 5, 2014
priority date (Note) -
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Abstract
A method and calculation unit are disclosed for reconstructing an image from measured projection data. In an embodiment, the method includes reconstructing an initial image from the projection data via back-projection; dividing the initial image into contiguous blocks of voxels; defining groups of voxels, wherein each group is defined by selecting one voxel from each block, each voxel having the same position relative to the other voxels within its block; updating the voxel values for all voxels within one group by minimizing a function consisting of a weighted sum of a first term representing the geometry of the data acquisition process, and a second regularization term; and repeating the updating of the voxel values for all voxels within one group until all groups have been updated at least once.
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