Method and apparatus for acquiring complete radon data for exactly reconstructing a three dimensional computerized tomography image of a portion of an object irradiated by a cone beam source
First Claim
1. A computer-related method of acquiring complete Radon data for exact reconstruction of a three dimensional image of a select portion of an object, wherein a region of support in the object space bounds said portion, said region of support in the object space being enclosed within a field of view of at least one cone beam source emitting a beam, said source being fixed with respect to a corresponding detector, said method comprising the steps of:
- selectively scanning with said beam along a path enclosing said region of support in the object space at the upper and lower extent of said portion respectively, said upper and lower scan paths being joined by a connecting scan path, said upper, lower, and connecting scan paths collectively defining a complete scan path for said select portion;
selectively partitioning each surface of integration corresponding to a data point in Radon space based on the intersection of said surface with said portion; and
selectively manipulating corresponding cone beam data according to said partitioning in order to discard data not directly attributable to said portion and recover otherwise missing data directly attributable to said portion.
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Abstract
A method and apparatus for exact three dimensional reconstruction of the image of a portion of interest of an object in the field of view of a cone beam source is disclosed, whereby unwanted Radon data are selectively disgarded avoiding undue corruption of the imaging process and missing Radon data that would otherwise be lost are selectively recovered. This is accomplished by ensuring the acquisition of a complete set of Radon data through proper choice of scanning configuration, then selectively partitioning and manipulating the acquired data to image only the select portion of interest of the object.
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Citations
16 Claims
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1. A computer-related method of acquiring complete Radon data for exact reconstruction of a three dimensional image of a select portion of an object, wherein a region of support in the object space bounds said portion, said region of support in the object space being enclosed within a field of view of at least one cone beam source emitting a beam, said source being fixed with respect to a corresponding detector, said method comprising the steps of:
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selectively scanning with said beam along a path enclosing said region of support in the object space at the upper and lower extent of said portion respectively, said upper and lower scan paths being joined by a connecting scan path, said upper, lower, and connecting scan paths collectively defining a complete scan path for said select portion; selectively partitioning each surface of integration corresponding to a data point in Radon space based on the intersection of said surface with said portion; and selectively manipulating corresponding cone beam data according to said partitioning in order to discard data not directly attributable to said portion and recover otherwise missing data directly attributable to said portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12)
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8. Apparatus for acquiring complete Radon data for exactly reconstructing a three dimensional image of a select portion of an object comprising:
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cone beam source for emitting a beam; detector means fixed with respect to said cone beam source; means for scanning with said beam source along an upper and lower path, each path respectively enclosing upper and lower extents of a region of support in the object space bounding said select portion of said object to be imaged, said region of support in the object space being enclosed within a field of view of said cone beam source; means for scanning a connecting scan path between said upper and lower scan paths, said upper, lower, and connecting scan paths collectively defining a complete scan path for said select portion; means for selectively discarding corresponding cone beam data attributable to regions beyond the region of support in the object space bounding said portion; means for selectively recovering corresponding cone beam data directly attributable to said portion although missing due to corruption attributable to regions beyond the region of support in the object space bounding said portion; and means for collecting retained cone beam data for image processing. - View Dependent Claims (13, 14, 15, 16)
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Specification