Pixel grouping for filtering cone beam detector data during 3D image reconstruction
First Claim
1. A method for three dimensional (3D) computerized topographic (CT) imaging of a region-of-interest (ROI) in an object, comprising:
- acquiring a plurality of sets of pixels of 2D image data by irradiating the object with energy from a cone beam source that is directed toward a pixelated 2D detector, at a corresponding plurality of scan path source positions located about the object;
filtering each of the acquired 2D image data sets so as to develop from the pixel image data of each set a corresponding one of a plurality of filtered 2D images; and
3D backprojecting each of the filtered 2D images into a common 3D space, thereby reconstructing in said 3D space a 3D image of the ROI in the object,wherein said filtering step comprises;
dividing the pixels of each set of the acquired 2D image data sets into first and second groups; and
separately filtering the first and second groups of pixels so as to independently develop for each group a corresponding image contribution for a given one of the filtered 2D images.
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Abstract
A method and apparatus for three dimensional (3D) computerized tomographic (CT) imaging of a region-of-interest (ROI) in an object, wherein image reconstruction processing is applied to a plurality of sets of pixels of 2D image data, each set being acquired on a pixelated 2D detector. The image reconstruction processing comprises filtering each of the acquired 2D image data sets for developing a corresponding plurality of filtered 2D images; and then 3D backprojecting the filtered 2D images into a common 3D space, thereby reconstructing in the 3D space a 3D image of the ROI in the object. In the present invention the filtering step comprises dividing the pixels of each set of the acquired 2D image data sets into first and second groups, and separately filtering the image data of each group to develop for each group it'"'"'s own contribution to the corresponding filtered 2D image. In accordance with one embodiment of the invention, the first group essentially comprises those pixels that contribute to a given filtered 2D image in a space-invariant manner, and the second group essentially comprises those pixels that contribute to the given filtered 2D image in a space-variant manner. In accordance with another embodiment of the invention, the first group essentially comprises a contiguous portion of the pixels of each set that are entirely internal to the boundaries of a data combination mask that is applied to each set of the acquired 2D image data, and the second group essentially comprises at least one boundary region of contiguous pixels that are on or adjacent to a data combination mask boundary.
69 Citations
22 Claims
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1. A method for three dimensional (3D) computerized topographic (CT) imaging of a region-of-interest (ROI) in an object, comprising:
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acquiring a plurality of sets of pixels of 2D image data by irradiating the object with energy from a cone beam source that is directed toward a pixelated 2D detector, at a corresponding plurality of scan path source positions located about the object; filtering each of the acquired 2D image data sets so as to develop from the pixel image data of each set a corresponding one of a plurality of filtered 2D images; and 3D backprojecting each of the filtered 2D images into a common 3D space, thereby reconstructing in said 3D space a 3D image of the ROI in the object, wherein said filtering step comprises; dividing the pixels of each set of the acquired 2D image data sets into first and second groups; and separately filtering the first and second groups of pixels so as to independently develop for each group a corresponding image contribution for a given one of the filtered 2D images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for three dimensional (3D) computerized tomographic (CT) imaging of a region-of-interest (ROI) in an object, comprising:
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a cone beam source for applying radiation energy to at least the ROI of the object; a 2D detector having a plurality of rows and columns of pixels therein for detecting radiation energy; means for defining a source scanning trajectory as a scan path traversed by the source; a manipulator for causing the cone beam source, fixed relative to the 2D detector with both source and detector movably positioned relative to the object, to scan about the ROI in the object at a plurality of source positions in a direction along the scan path, to cause the pixels of the 2D detector to acquire a set of 2D image data at each of said source positions; filter processing means for filtering each of the acquired 2D image data sets so as to develop therefrom a corresponding one of a plurality of filtered 2D images; and 3D backprojection means for 3D backprojecting each of the filtered 2D images into a common 3D space, thereby reconstructing in said 3D space a 3D image of the ROI in the object, wherein the filter processing means comprises; dividing means for dividing the pixels of each set of the acquired 2D image data sets into first and second groups; and individualized filter processing means for separately filtering the first and second groups of pixels so as to independently develop for each group a corresponding image contribution for a given one of the filtered 2D images. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification