Three-dimensional SPECT reconstruction of combined cone-beam and fan-beam data
First Claim
1. In a gamma camera system for diagnostic imaging having at least first and second gamma camera heads disposed for movement around and facing an examination region, each gamma camera head receiving radiation from the examination region and producing electronic data indicative thereof, the improvement comprising:
- a fan-beam collimator mounted on a radiation receiving face of the first gamma camera head, such that the first gamma camera head generates fan-beam data indicative of the received emission radiation;
a cone-beam collimator mounted on a radiation receiving face of the second gamma camera head, such that the second gamma camera head generates cone-beam data indicative of the received emission radiation; and
,a reconstruction processor for reconstructing a three-dimensional image representation from the cone-beam and fan-beam data.
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Accused Products
Abstract
A SPECT system includes three gam camera heads (22a), (22b), (22c) which are mounted to a gantry (20) for rotation about a subject (12). The subject is injected with a source of emission radiation, which emission radiation is received by the camera heads. Camera head (22a) has a fan-beam collimator (24a) mounted on a radiation receiving face and generates fan-beam data indicative of the received emission radiation. The camera heads (22b) and (22c) each have a cone-beam collimator (24b), (24c) mounted respectively on their radiation receiving face and generate cone-beam data indicative of the received emission radiation. A transmission radiation source (26) is mounted opposite the camera head (22a) having the fan-beam collimator (24a). The fan-beam detector head (22a) further receives transmission radiation and generates fan-beam transmission radiation indicative thereof. A transmission data reconstruction processor (50) reconstructs the fan-beam transmission data. An emission data memory (110) separately stores the fan-beam and cone-beam emission data. Attenuation correction processors (78, 86) correct the emission data in accordance with the reconstructed attenuation data. An emission data reconstructor (72) reconstructs the corrected emission data into a corresponding three-dimensional image representation which is selectively displayed on a display (76) in a human-readable form.
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Citations
13 Claims
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1. In a gamma camera system for diagnostic imaging having at least first and second gamma camera heads disposed for movement around and facing an examination region, each gamma camera head receiving radiation from the examination region and producing electronic data indicative thereof, the improvement comprising:
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a fan-beam collimator mounted on a radiation receiving face of the first gamma camera head, such that the first gamma camera head generates fan-beam data indicative of the received emission radiation; a cone-beam collimator mounted on a radiation receiving face of the second gamma camera head, such that the second gamma camera head generates cone-beam data indicative of the received emission radiation; and
,a reconstruction processor for reconstructing a three-dimensional image representation from the cone-beam and fan-beam data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating diagnostic images of an interior portion of a subject, the method comprising:
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injecting the subject with a radiopharmaceutical which emits emission radiation; collimating the emission radiation travelling toward a first detector into a plurality of fan-beam rays which diverge from a common focal line; converting the fan-beam rays into emission fan-beam data with the first detector; collimating the emission radiation travelling toward a second detector into a plurality of cone-beam rays which diverge from a common focal point; converting the cone-beam rays into emission cone-beam data with the second detector; rotating the fan-beam focal line and the cone-beam focal point, the fan-beam and cone-beam rays, and the first and second detectors around the subject; reconstructing a common volumetric image representation from the fan-beam and cone-beam data; selectively converting portions of the volumetric image representation into the diagnostic images. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A gamma camera system for diagnostic imaging comprising:
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a first, second, and third gamma heads disposed for movement around and facing an examination region, each gamma camera head receiving emission radiation from the examination region and producing emission data indicative thereof; a fan-beam collimator mounted on the first gamma camera head; a cone-beam collimator mounted on each of the second and third gamma camera heads; a transmission radiation source disposed across the examination region and opposite from the first gamma camera head, the first gamma camera head generating both fan-beam emission data from the received emission radiation from the examination region and fan-beam transmission data from the received transmission radiation; and
,a reconstruction processor for reconstructing a three-dimensional image representation from the fan-beam transmission data, the fan-beam emission data, and the cone-beam emission data.
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Specification