Full field digital tomosynthesis method and apparatus
First Claim
1. A tomosynthesis system for forming a three dimensional image of an object, comprising:
- an X-ray source configured to irradiate the object with a beam of X-rays from a plurality of positions along a path in a sector;
an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object; and
a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector;
wherein;
the X-ray source irradiates the object with the beam of X-rays such that the focal spot of the beam of X-rays follows a non arc shaped path;
ora center of the beam of X-rays impinges substantially on the same location on the detector from different X-ray source positions in the sector.
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Accused Products
Abstract
A tomosynthesis system for forming a three dimensional image of an object is provided. The system includes an X-ray source adapted to irradiate the object with a beam of X-rays from a plurality of positions in a sector, an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object and a processor which is adapted to generate a three dimensional image of the object based on X-rays detected by the detector. The detector is adapted to move relative to the object and/or the X-ray source is adapted to irradiate the object with the beam of X-rays such that the beam of X-rays follows in a non arc shaped path and/or a center of the beam of X-rays impinges substantially on the same location on the detector from different X-ray source positions in the sector.
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Citations
55 Claims
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1. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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an X-ray source configured to irradiate the object with a beam of X-rays from a plurality of positions along a path in a sector; an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector; wherein; the X-ray source irradiates the object with the beam of X-rays such that the focal spot of the beam of X-rays follows a non arc shaped path;
ora center of the beam of X-rays impinges substantially on the same location on the detector from different X-ray source positions in the sector. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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4. The system of 3, further comprising:
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a detector housing; and a piezoelectric actuator configured to move the detector in the detector housing.
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17. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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a first means for irradiating the object with a beam of X-rays from a plurality of positions along a path in a sector; a second means for detecting X-rays transmitted through the object; and a third means for generating a three dimensional image of the object based on X-rays detected by the second means; wherein; the first means is a means for irradiating the object with the beam of X-rays such that a focal spot of the beam of X-rays follows a non arc shaped path relative to the object; and the first means is a means for irradiating the object with the beam of X-rays such that a center of the beam of X-rays impinges substantially on the same location on the second means from different first means positions in the sector. - View Dependent Claims (18, 19, 21, 22, 23, 24, 25, 26, 27, 28)
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20. The system of 19, further comprising:
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an actuator configured to move the second means, wherein the second means comprises a detector; and at least one of a movable arm and combination of a rail and a motor which is configured to move the first means, wherein the first means comprises an X-ray source.
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29. A tomosynthesis method of forming a three dimensional image of an object, comprising:
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(a) acquiring a set of tomosynthesis projections, comprising; moving an X-ray source along a path through a sector; irradiating the object with a beam of X-rays from the X-ray source at a plurality of positions in the sector; and detecting X-rays transmitted through the object with a detector; and (b) generating a three dimensional image of the object based on the detected X-rays; wherein; the X-ray source irradiates the object with the beam of X-rays such that the focal spot of the beam of X-rays follows a non arc shaped and non linear path;
ora center of the beam of X-rays impinges substantially on the same location on the detector from different X-ray source positions in the sector. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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an X-ray source configured to periodically irradiate the object with a beam of X-rays, wherein the X-ray source is configured to emit the beam of X-rays while rotating and moving in a first direction along a path in a sector; an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object, wherein the detector is configured to move in a second direction opposite to the first direction while the X-ray source moves in the first direction and the X-ray source emits the beam of X-rays; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector; wherein; the X-ray source is configured to rotate in an arc shaped path and to periodically emit the beam of X-rays from a plurality of positions along the arc shaped path; and the X-ray source is configured to rotate at a first speed while the X-ray source emits the beam of X-rays and to rotate at a second speed higher than the first speed while the X-ray source does not emit the beam of X-rays. - View Dependent Claims (44)
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45. A tomosynthesis method of forming a three dimensional image of an object, comprising:
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rotating an X-ray source in a first direction in a path through a sector; emitting a beam of X-rays from the X-ray source while the X-ray source is rotating and moving along the path in the first direction; periodically irradiating the object with the X-ray beam; moving a detector in a second direction opposite to the first direction while the X-ray source emits the X-ray beam and the X-ray source moves in the first direction; detecting X-rays transmitted through the object with the detector; and generating a three dimensional image of the object based on the detected X-rays. - View Dependent Claims (46, 47, 48)
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49. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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at least two X-ray sources configured to irradiate the object with beams of X-rays from a plurality of rotationally displaced positions along a path in a sector; an X-ray detector positioned relative to the at least two X-ray sources and movable linearly to detect X-rays transmitted through the object; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector; wherein the at least two X-ray sources are configured to rotate in an arc shaped path in respective at least two parallel planes and a first X-ray source is offset from a second X-ray source in a direction perpendicular to the parallel planes. - View Dependent Claims (50, 51)
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52. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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an X-ray source configured to irradiate the object with a beam of X-rays from a plurality of positions along a path in a sector; an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector; wherein the X-ray source is configured to rotate along the path in the sector in a first angular direction relative to the object, such that the focal spot of the X-ray beam moves in the first angular direction; and the detector is configured to rotate in the direction different from the first angular direction.
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53. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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an X-ray source configured to irradiate the object with a beam of X-rays from a plurality of positions along a path in a sector; an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector; wherein the X-ray source is configured to rotate in an arc shaped path in a first angular direction relative to the object; and the detector is configured to move in an arc shaped path in a second angular direction opposite to the first direction.
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54. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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an X-ray source configured to periodically irradiate the object with a beam of X-rays, wherein the X-ray source is configured to emit the beam of X-rays while moving in a first direction along a path in a sector; an X-ray detector positioned relative to the X-ray source to detect X-rays transmitted through the object, wherein the detector is configured to move in a second direction opposite to the first direction while the X-ray source moves in the first direction and the X-ray source emits the beam of X-rays; and a processor which is configured to generate a three dimensional image of the object based on X-rays detected by the detector, wherein; the X-ray source is configured to rotate in an arc shaped path and to periodically emit the beam of X-rays from a plurality of positions along the arc shaped path; and the X-ray source is configured to rotate at a first speed while the X-ray source emits the beam of X-rays and to rotate at a second speed higher than the first speed while the X-ray source does not emit the beam of X-rays.
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55. A tomosynthesis system for forming a three dimensional image of an object, comprising:
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rotating an X-ray source in a first direction in a path through a sector; emitting a beam of X-rays from the X-ray source while the X-ray source is moving along the path in the first direction; periodically irradiating the object with the X-ray beam; moving a detector in a second direction opposite to the first direction while the X-ray source emits the X-ray beam and the X-ray source moves in the first direction; detecting X-rays transmitted through the object with the detector; and generating a three dimensional image of the object based on the detected X-rays, while rotating an X-ray source in a first direction along the path through a sector comprises rotating the X-ray source in an arc shaped path at a first speed while the X-ray source emits the beam of X-rays and at a second speed higher than the first speed while the X-ray source does not emit the beam of X-rays.
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Specification