Patent ID: 8135186
Filing Date: 2012-03-13
Classification: G06T

Abstract:
1. An imaging system comprising: a source generating an x-ray beam; a detector array receiving said x-ray beam and generating projection data; a translatable table configured for disposal of an object thereon and operable to translate in relation to said source and said detector array; said source and said detector array rotating about said translatable table to scan said object; and an image reconstructor electrically coupled to said detector array and configured to reconstruct an image in response to said projection data via an iterative reconstruction technique configured to perform a targeted statistical reconstruction; wherein the image reconstructor is configured to perform said iterative reconstruction technique by weighting each of a plurality of pixels in said image according to a contribution of each of said pixels to a region of interest; the image reconstructor is further configured to perform said iterative reconstruction technique by updating in low resolution each of said plurality of pixels that said weighting determines to be most contributory to said region of interest; the image reconstructor is further configured to perform said iterative reconstruction technique by performing a high resolution forward projection in said region of interest and performing a low resolution forward projection over the remaining area of said image; and the image reconstructor is further configured to perform said iterative reconstruction technique by correcting for a resulting cumulative forward projection that is not scale-invariant.