SYSTEMS, METHODS AND APPARATUS FOR CONSISTENCY-CONSTRAINED FILTERED BACKPROJECTION FOR OUT-OF-FOCUS ARTIFACTS IN DIGITAL TOMOSYTHESIS
First Claim
Patent Images
1. A method to suppress out-of-focus artifacts during backprojection of a plurality of two-dimensional projections, wherein the backprojecting further comprises for each voxel in a reconstructed three-dimensional image the method comprising:
- storing a plurality of backprojected contributions in a memory;
sorting the plurality of backprojected contributions by value into a monotonic order in the memory;
identifying at least one contribution of the sorted contributions in the memory that is significantly different than other sorted contributions in reference to at least one criteria of significance;
replacing each of the at least one identified contribution in the memory with a value selected from at least one of a group of values; and
combining the replaced contributions in the memory by an operator.
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Abstract
Systems, methods and apparatus are provided through which in some embodiments during backprojection of filtered two-dimensional into three dimensional image each voxel is analyzed for inconsistent contributions based on at least two criteria and each of the inconsistent contributions is either replaced or excluded from the backprojection.
11 Citations
23 Claims
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1. A method to suppress out-of-focus artifacts during backprojection of a plurality of two-dimensional projections, wherein the backprojecting further comprises for each voxel in a reconstructed three-dimensional image the method comprising:
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storing a plurality of backprojected contributions in a memory; sorting the plurality of backprojected contributions by value into a monotonic order in the memory; identifying at least one contribution of the sorted contributions in the memory that is significantly different than other sorted contributions in reference to at least one criteria of significance; replacing each of the at least one identified contribution in the memory with a value selected from at least one of a group of values; and combining the replaced contributions in the memory by an operator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-accessible medium having executable instructions that are capable of directing a processor to suppress out-of-focus artifacts during backprojection of a plurality of two-dimensional projections, wherein for each voxel in a reconstructed three-dimensional image, the executable instructions perform:
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storing a plurality of backprojected contributions in a memory; sorting the plurality of backprojected contributions by value into a monotonic order in the memory; identifying at least one contribution of the sorted contributions in the memory that is significantly different than other sorted contributions in reference to at least one criteria of significance, wherein the criteria includes; an intensity of each of the at least one contribution being more than some multiple C of the standard deviation from a mean of the plurality of sorted contributions; an intensity of each of the at least one contribution being within the top or the bottom P percentiles range of all of the plurality of sorted contributions;
oran absolute distance between an intensity of each of the at least one contribution to the mean of the plurality of sorted contributions that is more than a value K; and replacing each of the at least one identified contribution in the memory with a value selected from at least one of a group of values consisting of; a mean of the at least one contribution other than the each of the at least one identified contribution; a median of the at least one contribution other than the each of the at least one identified contribution; another statistic of the at least one contribution other than the each of the at least one identified contribution; a mean of the at least one contribution other than the at least one identified contribution; and combining the updated contributions in the memory by an operator, wherein the operator includes maximum, minimum, average, or median. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a processor; a storage device coupled to the processor; and apparatus operative on the processor to; receive into the storage device, a plurality of two-dimensional projections of an object from a plurality of angles; generate into the storage device, three-dimensional images by backprojecting an enhanced plurality of two-dimensional projections, wherein the backprojecting further comprises for each voxel in a reconstructed three-dimensional image; storing all backprojected contributions from the plurality of two-dimensional projections in the storage device; sorting the contributions in the storage device by their values into a monotonic order;
identifying outlier contributions in the storage device;replacing the outlier contributions in the storage device with a value selected from at least one of a group of values; and combining in the storage device the replaced contributions in the memory by an operator, wherein the operator includes maximum, minimum, average, or median. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification