Method and system for creating three-dimensional images using tomosynthetic computed tomography
First Claim
Patent Images
1. A system for synthesizing an image slice of a selected object from multiple projected object images created by irradiating the object with a source of radiation, comprising:
- a. a fiducial reference located at a fixed position relative to the selected object to provide constraint for a number of degrees of freedom correlated to a number of degrees of freedom of the system, the fiducial reference comprising at least a first and a second identifiable reference marker disposed in a fixed position relative to one another;
b. a recording medium for recording projected images of the fiducial reference and a region of interest of the selected object; and
c. an image synthesizer configured to the compute an effective radiographic diameter of the image of the first reference marker in the projected images and to compute the relative magnification among the projected images based on the effective radiographic diameter, the synthesizer configured to reconstruct a tomographic slice from the object images scaled to the same relative magnification;
wherein the fiducial reference, the source of radiation, and the recording medium are configured to be arbitrarily movable relative to one another during the recording of the projected images.
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Abstract
A system for constructing image slices through a selected object, the system comprising an identifiable fiducial reference in a fixed position relative to the selected object, wherein the fiducial reference comprises at least two identifiable reference markers. A source of radiation is provided for irradiating the selected object and the fiducial reference to form a projected image of the selected object and the fiducial reference which is recorded by a recording medium.
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Citations
23 Claims
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1. A system for synthesizing an image slice of a selected object from multiple projected object images created by irradiating the object with a source of radiation, comprising:
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a. a fiducial reference located at a fixed position relative to the selected object to provide constraint for a number of degrees of freedom correlated to a number of degrees of freedom of the system, the fiducial reference comprising at least a first and a second identifiable reference marker disposed in a fixed position relative to one another; b. a recording medium for recording projected images of the fiducial reference and a region of interest of the selected object; and c. an image synthesizer configured to the compute an effective radiographic diameter of the image of the first reference marker in the projected images and to compute the relative magnification among the projected images based on the effective radiographic diameter, the synthesizer configured to reconstruct a tomographic slice from the object images scaled to the same relative magnification; wherein the fiducial reference, the source of radiation, and the recording medium are configured to be arbitrarily movable relative to one another during the recording of the projected images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for synthesizing an image slice through a selected object at a selected slice position through the object from a plurality of projected images of the object comprising the steps of:
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a. providing a fiducial reference located at a fixed position relative to the selected object to provide constraint for a number of degrees of freedom correlated to a number of degrees of freedom of the system, the fiducial reference comprising at least a first and a second identifiable reference marker disposed in a fixed position relative to one another; b. recording projected images of a region of interest of the selected object and the fiducial reference on a recording means at different arbitrary relative positions between (1) a source of radiation, (2) the selected object and fiducial reference, and (3) the recording means; c. computing the effective magnification of each projected image by determining the radiographic diameter of the projected image of the first reference marker in each projected image, and scaling each projected image to the same magnification; and d. synthesizing an image slice of the selected object at a selected slice position through the object from the projected images. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification