Imaging facility and radiation therapy device
First Claim
Patent Images
1. An imaging facility comprising:
- an X-ray source operable to emit a cone beam;
an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface;
a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation;
a first translation facility configured to move the X-ray source from a first position relative to a portion of the rotation facility in a direction that has a component that is tangential to a circle of rotation around the center of rotation;
a second translation facility configured to move the X-ray detector from a second position relative to the portion of the rotation facility, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, image data is recorded while the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, image data is recorded when the X-ray source and the X-ray detector are moved by the first translation facility and the second translation facility, respectively, to be aligned with each other such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and
a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated, wherein the processor is configured to perform a first pre-weighting of the image data recorded in the first operating mode and a second pre-weighting of the image data recorded in the second operating mode, wherein the first pre-weighting is different than the second pre-weighting, wherein the second pre-weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode,wherein the first pre-weighting is based on pixel coordinates relative to a point of contact of the isocentric beam, andwherein the second pre-weighting is based on pixel coordinates relative to a point of impact of a beam striking the surface of the X-ray detector at a substantially perpendicular angle.
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Abstract
An imaging facility having an X-ray source, an X-ray detector, and a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation. The imaging facility also has a first translation facility operable to move the X-ray source in a direction that has a component that is tangential to a circle of rotation around the center of rotation.
171 Citations
22 Claims
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1. An imaging facility comprising:
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an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility configured to move the X-ray source from a first position relative to a portion of the rotation facility in a direction that has a component that is tangential to a circle of rotation around the center of rotation; a second translation facility configured to move the X-ray detector from a second position relative to the portion of the rotation facility, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, image data is recorded while the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, image data is recorded when the X-ray source and the X-ray detector are moved by the first translation facility and the second translation facility, respectively, to be aligned with each other such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated, wherein the processor is configured to perform a first pre-weighting of the image data recorded in the first operating mode and a second pre-weighting of the image data recorded in the second operating mode, wherein the first pre-weighting is different than the second pre-weighting, wherein the second pre-weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first pre-weighting is based on pixel coordinates relative to a point of contact of the isocentric beam, and wherein the second pre-weighting is based on pixel coordinates relative to a point of impact of a beam striking the surface of the X-ray detector at a substantially perpendicular angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radiation therapy device comprising:
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a therapeutic radiation source configured to direct a therapeutic treatment beam onto an object to be irradiated; and an imaging facility comprising; an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility configured to move the X-ray source from a first position relative to a portion of the rotation facility, in a direction that has a component that is tangential to a circle of rotation around the center of rotation; a second translation facility configured to move the X-ray detector from a second position relative to the portion of the rotation facility, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, image data is recorded while the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, image data is recorded when the X-ray source and the X-ray detector are moved by the first and second translation facilities to be aligned with each other such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated, wherein the processor is configured to perform a first pre-weighting of the image data recorded in the first operating mode and a second pre-weighting of the image data recorded in the second operating mode, wherein the first pre-weighting is different than the second pre-weighting, wherein the second pre-weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first pre-weighting is based on the X-ray source being centered with respect to the X-ray detector, and wherein the second pre-weighting is based on comparison of pixel coordinates to coordinates of a point of impact of a beam striking the surface of the X-ray detector at a substantially perpendicular angle. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An imaging facility comprising:
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an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility operable to move the X-ray source in a direction that has a component that is tangential to a circle of rotation around the center of rotation, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation, and the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation and the X-ray source is moved by the first translation facility such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated and further configured to perform, during the reconstruction, a first weighting of the image data recorded in the first operating mode and a second weighting of the image data recorded in the second operating mode, wherein the first weighting is different than the second weighting, wherein the second weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first weighting is based on the X-ray source being centered with respect to the X-ray detector, and wherein the second weighting is based on comparison of pixel coordinates to coordinates of a point of impact of a beam striking the surface of the X-ray detector at a substantially perpendicular angle. - View Dependent Claims (17, 18)
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19. An imaging facility comprising:
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an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility configured to move the X-ray source from a first position relative to a portion of the rotation facility in a direction that has a component that is tangential to a circle of rotation around the center of rotation; a second translation facility configured to move the X-ray detector from a second position relative to the portion of the rotation facility, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, image data is recorded while the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, image data is recorded when the X-ray source and the X-ray detector are moved by the first translation facility and the second translation facility, respectively, to be aligned with each other such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated, wherein the processor is configured to perform a first pre-weighting of the image data recorded in the first operating mode and a second pre-weighting of the image data recorded in the second operating mode, wherein the first pre-weighting is different than the second pre-weighting, wherein the second pre-weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first pre-weighting is based on a comparison of pixel coordinates to coordinates of a first beam striking the surface of the X-ray detector at a substantially perpendicular angle, and the second pre-weighting is based on a comparison of pixel coordinates to coordinates of a second beam striking the surface of the X-ray detector at a substantially perpendicular angle.
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20. A radiation therapy device comprising:
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a therapeutic radiation source configured to direct a therapeutic treatment beam onto an object to be irradiated; and an imaging facility comprising; an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility configured to move the X-ray source from a first position relative to a portion of the rotation facility, in a direction that has a component that is tangential to a circle of rotation around the center of rotation; a second translation facility configured to move the X-ray detector from a second position relative to the portion of the rotation facility, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, image data is recorded while the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, image data is recorded when the X-ray source and the X-ray detector are moved by the first and second translation facilities to be aligned with each other such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated, wherein the processor is configured to perform a first pre-weighting of the image data recorded in the first operating mode and a second pre-weighting of the image data recorded in the second operating mode, wherein the first pre-weighting is different than the second pre-weighting, wherein the second pre-weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first pre-weighting is based on a comparison of pixel coordinates to coordinates of a first beam striking the surface of the X-ray detector at a substantially perpendicular angle, and the second pre-weighting is based on a comparison of pixel coordinates to coordinates of a second beam striking the surface of the X-ray detector at a substantially perpendicular angle.
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21. An imaging facility comprising:
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an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility operable to move the X-ray source in a direction that has a component that is tangential to a circle of rotation around the center of rotation, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation, and the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation and the X-ray source is moved by the first translation facility such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated and further configured to perform, during the reconstruction, a first weighting of the image data recorded in the first operating mode and a second weighting of the image data recorded in the second operating mode, wherein the first weighting is different than the second weighting, wherein the second weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first weighting is based on a comparison of pixel coordinates to coordinates of a first beam striking the surface of the X-ray detector at a substantially perpendicular angle, and the second weighting is based on a comparison of pixel coordinates to coordinates of a second beam striking the surface of the X-ray detector at a substantially perpendicular angle.
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22. An imaging facility comprising:
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an X-ray source operable to emit a cone beam; an X-ray detector, wherein the X-ray source, the X-ray detector, or the X-ray source and the X-ray detector are positionable such that an isocentric beam emitted by the X-ray source strikes a surface of the X-ray detector at different angles relative to the surface; a rotation facility operable to rotate the X-ray source and the X-ray detector around a center of rotation; a first translation facility operable to move the X-ray source in a direction that has a component that is tangential to a circle of rotation around the center of rotation, wherein the imaging facility is operable in a first operating mode and a second operating mode, wherein in the first operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation, and the X-ray source and the X-ray detector are aligned with each other such that a central beam of the X-ray source essentially passes through the center of rotation, and wherein in the second operating mode, the X-ray detector is configured to record image data while the X-ray source and the X-ray detector are rotated around the center of rotation and the X-ray source is moved by the first translation facility such that the central beam emitted by the X-ray source runs laterally past the center of rotation; and a processor unit configured to reconstruct a three-dimensional image from the image data recorded while the X-ray source and the X-ray detector are rotated and further configured to perform, during the reconstruction, a first weighting of the image data recorded in the first operating mode and a second weighting of the image data recorded in the second operating mode, wherein the first weighting is different than the second weighting, wherein the second weighting is based on a shift of the X-ray source relative to the first position by the first translation facility in the second operating mode, wherein the first weighting is based a first projection matrix that reflects the X-ray source being centered with respect to the X-ray detector, and wherein the second weighting is based on a second projection matrix that reflects the X-ray source being shifted with respect to the X-ray detector.
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Specification