CORRECTING AND RECONSTRUCTING X-RAY IMAGES USING PATIENT MOTION VECTORS EXTRACTED FROM MARKER POSITIONS IN X-RAY IMAGES
First Claim
1. A method for correcting and reconstructing a plurality of projection images based on detected patient motion, the method executed by an imaging system including a computer with an electronic processing unit and a memory module storing a projection matrix calculation module and a reconstruction module, both executable by the electronic processing unit, the method comprising:
- obtaining, at the computer, a plurality of projection images generated by a scanner, each of the plurality of projection images including at least three markers, each of the at least three markers having a measured three-dimensional position and measured positions on a detector panel of the scanner in a first dimension and a second dimension;
determining, with the electronic processing unit, a position error vector for each of the plurality of projection images based on the at least three markers in each of the plurality of projection images, the position error vector defining patient motion in the projection image;
combining each position error vector for each of the plurality of projection images with geometric parameters associated with the scanner to derive a projection matrix for each of the plurality of projection images; and
generating reconstructed images corrected for patient motion from the plurality of projection images and the projection matrix for each of the plurality of projection images.
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Accused Products
Abstract
A method and a system for correcting and reconstruing a plurality of projection images based on detected patient motion. The method includes obtaining a plurality of projection images generated by a scanner. Each of the plurality of projection images includes at least three markers. Each of the at least three markers has a measured three-dimensional position and measured positions on a detector panel of the scanner in a first dimension and a second dimension. The method further includes determining a position error vector for each of the plurality of projection images based on the at least three markers in each of the plurality of projection images, the position error vector defining patient motion in the projection image. The method finally includes combining each position error vector for each of the plurality of projection images with geometric parameters associated with the scanner to derive a projection matrix for each of the plurality of projection images, and generating reconstructed images corrected for patient motion from the plurality of projection images and the projection matrix for each of the plurality of projection images.
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Citations
20 Claims
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1. A method for correcting and reconstructing a plurality of projection images based on detected patient motion, the method executed by an imaging system including a computer with an electronic processing unit and a memory module storing a projection matrix calculation module and a reconstruction module, both executable by the electronic processing unit, the method comprising:
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obtaining, at the computer, a plurality of projection images generated by a scanner, each of the plurality of projection images including at least three markers, each of the at least three markers having a measured three-dimensional position and measured positions on a detector panel of the scanner in a first dimension and a second dimension; determining, with the electronic processing unit, a position error vector for each of the plurality of projection images based on the at least three markers in each of the plurality of projection images, the position error vector defining patient motion in the projection image; combining each position error vector for each of the plurality of projection images with geometric parameters associated with the scanner to derive a projection matrix for each of the plurality of projection images; and generating reconstructed images corrected for patient motion from the plurality of projection images and the projection matrix for each of the plurality of projection images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for correcting and reconstructing a plurality of projection images based on detected patient motion, the system comprising:
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a scanner; and a computer including an electronic processing unit, a memory module, and an input/output interface, where the memory is configured to store a projection matrix calculation module and a reconstruction module, both executed by the electronic processing unit; wherein the scanner is configured to obtain and send to the computer a plurality of projection images generated by the scanner, each of the plurality of projection images including at least three markers, each of the at least three markers having a measured three-dimensional position and measured positions on a detector panel of the scanner in a first dimension and a second dimension, wherein the electronic processing unit is configured to determine a position error vector for each of the plurality of projection images based on the at least three markers in each of the plurality of projection images, the position error vector defining patient motion in the projection image, wherein the electronic processing unit is configured to combine each position error vector for each of the plurality of projection images with geometric parameters associated with the scanner to derive a projection matrix for each of the plurality of projection images, wherein the electronic processing unit is configured to generate reconstructed images corrected for patient motion from the plurality of projection images and the projection matrix for each of the plurality of projection images. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification