Method and apparatus for cone beam CT dynamic imaging
First Claim
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1. A method for forming an image of an object, the method comprising:
- (a) performing a cone-beam scan of the object in a scanning plane by using a cone-beam emitter and a detector to perform a half-circle scanning geometry so as to obtain projection data for a plurality of rows;
(b) weighting the projection data with a weighting factor to produce weighted projection data, wherein the weighting factor decreases as the rows become farther from the scanning plane, wherein the weighting factor is a function of a weighting angle which is a function of the row and a scan angle, wherein the weighting angle is
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Abstract
A cone-beam scanning system scans along a half circle. The reconstruction uses a weighting function which decreases for rows farther from the scan plane to take the redundancy of the projection data into account. Another embodiment uses a circle plus sparse helical scan geometry. Image data can be taken in real time.
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Citations
10 Claims
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1. A method for forming an image of an object, the method comprising:
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(a) performing a cone-beam scan of the object in a scanning plane by using a cone-beam emitter and a detector to perform a half-circle scanning geometry so as to obtain projection data for a plurality of rows; (b) weighting the projection data with a weighting factor to produce weighted projection data, wherein the weighting factor decreases as the rows become farther from the scanning plane, wherein the weighting factor is a function of a weighting angle which is a function of the row and a scan angle, wherein the weighting angle is - View Dependent Claims (2, 3, 4, 5)
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6. A system for forming an image of an object, the system comprising:
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a cone-beam emitter; a detector; a gantry for causing relative movement of the emitter and the detector for performing a cone-beam scan of the object in a scanning plane by using a cone-beam emitter and a detector to perform a half-circle scanning geometry so as to obtain projection data for a plurality of rows; and a processor, receiving the projection data, for weighting the projection data with a weighting factor to produce weighted projection data, wherein the weighting factor decreases as the rows become farther from the scanning plane and forming the image from the weighted projection data, wherein the weighting factor is a function of a weighting angle which is a function of the row and a scan angle, wherein the weighting angle is - View Dependent Claims (7, 8, 9, 10)
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Specification