Image reconstruction from V-projections acquired by Compton camera
First Claim
1. A method of generating an image representation of a region of interest of a subject having radiation emitted therefrom, the radiation being detected by a first Compton camera, the method comprising:
- collecting radiation data from the detected radiation as a v-shaped projection defined by converging lines;
converting the v-shaped projection into a parallel projection; and
reconstructing an image representation from the parallel projection.
3 Assignments
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Accused Products
Abstract
A SPECT system includes a Compton camera (14) disposed on a gantry (16). The camera (14) includes linear detectors (30a, 30b) operating without mechanical collimation for detecting radiation emanating from a subject to be imaged. A data processor (22) collects and processes radiation data in accordance with the detected radiation. Position and energy resolving circuitry (24) determines positions and energy deposited by photons striking the detectors. A projection generator (34) generates divergent projections or V-projections based on the collected data which determine a possible location of a gamma source of the detected radiation. A conversion processor (36) converts the V-projections into parallel projection data such as a Radon transformation. A reconstruction processor (38) reconstructs an image representation of a region of interest from the subject from the parallel projection data using filtered back projection. Alternately, two Compton cameras (70, 72) disposed at a selected angle to each other collect the radiation data and V-projections are generated from both cameras. A combination of V-projections are selected from both cameras and are converted into parallel projections before reconstruction of an image representation.
80 Citations
29 Claims
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1. A method of generating an image representation of a region of interest of a subject having radiation emitted therefrom, the radiation being detected by a first Compton camera, the method comprising:
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collecting radiation data from the detected radiation as a v-shaped projection defined by converging lines; converting the v-shaped projection into a parallel projection; and reconstructing an image representation from the parallel projection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A diagnostic imaging system for reconstructing an image representation of a subject including a first plurality of radiation detectors parallelly disposed to each other for detecting radiation from an examination region, and producing electrical data indicative of coordinate locations and energy values on each of the radiation detectors at which radiation is detected, the radiation detected being scattered by at least one of the radiation detectors at a scattering angle, and a reconstruction processor reconstructs an image representation, the diagnostic imaging system comprising:
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a projection processor for determining the scattering angle based on the energy values of the received radiation on the first plurality of radiation detectors and generating divergent projection data defined by (i) a vertex at a location where the radiation is detected on a first radiation detector of the first plurality of radiation detectors nearest the examination region, and (ii) the scattering angle; and a conversion processor for converting the divergent projection data to parallel projection data which the reconstruction processor reconstructs into an image representation. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of generating an image representation of a region of interest of a subject by a SPECT diagnostic imaging system where the subject is injected with a radiation source, the method comprising:
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detecting a photon from the radiation source at a first position on a first radiation detection plane and scattering the photon at a scattering angle; detecting the scattered photon at a second position on a second radiation detection plane, the second radiation detector plane being parallel to the first radiation detection plane; determining two lines which intersect at the first position on the first radiation detection plane which diverge in accordance with the scattering angle, a source of the photon lying along one of the lines; generating a three-dimensional set of projection data based on integrals taken along the two lines; dividing the three-dimensional set of projection data into a plurality of two-dimensional subsets of projection data such that one subset defines an equivalency with a line integral of the region of interest; and reconstructing the one subset of projection data into an image representation of the region of interest of the subject. - View Dependent Claims (21, 22, 23, 24, 25)
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26. An image reconstruction assembly which generates an image representation of an object including a gamma source, the assembly comprising:
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radiation detecting means for detecting radiation received from the gamma source by electronic collimation and collecting radiation data based on the radiation detected; a means for generating divergent projection data from the radiation data collected; a means for transforming the divergent projection data into parallel projection data; and a reconstruction processor which reconstructs the parallel projection data into an image representation. - View Dependent Claims (27, 28, 29)
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Specification