Apparatus and methods for determining spatial coordinates of radiolabelled tissue using gamma-rays and associated characteristic X-rays
First Claim
1. A system for determining the location of a mass of radiolabelled tissue with respect to a reference point, the tissue having been provided with at least one radiolabelled tracer producing gamma-ray photons, characteristic x-ray photons, and an associated continuum of Compton-scattered photons, said system comprising radiation detecting means, signal processing means and signal analyzing means, said radiation detecting means being positionable to a location adjacent the radiolabelled tissue for detecting the photons emitted thereby and for providing an electrical signal representative of the received photons, said radiation detecting means and its position relative to the tissue establishing the reference point, said signal processing means utilizing said electrical signal to produce a processed electrical signal being representative of the number of photons detected as a function of their energies, said analyzing means being arranged for analyzing portions of said processed signal utilizing the known naturally occurring abundance of emitted photons of different energies represented by said processed signal for said at least one radiolabelled tracer as a reference factor in such analysis, whereupon said analysis of portions of said processed signal utilizing said reference factor establishes the location of the mass of radiolabelled tissue with respect to the reference point.
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Accused Products
Abstract
A system and method for diagnostic testing of structures within a body, e.g., organs within the body of a living being, which has been provided with a radioactive imaging agent, e.g., a radiotracer, to cause the structure to produce gamma rays, associated characteristic x rays, and a continuum of Compton-scattered photons. The system includes a radiation receiving device, e.g., a hand-held probe or camera, an associated signal processor, and an analyzer. The radiation receiving device is arranged to be located adjacent the body and the structure for receiving gamma rays and characteristic x rays emitted from the structure and for providing a processed electrical signal representative thereof. The processed electrical signal includes a first portion representing the characteristic x rays received and a second portion representing the gamma rays received. In a preferred embodiment of the invention the signal processor removes the signal corresponding to the Compton-scattered photons from the electrical signal in the region of the full-energy gamma ray and the characteristic x ray. The analyzer is arranged to selectively use the x-ray portion of said processed signal to provide near-field information about the structure, to selectively use both the x-ray and the gamma-ray portions of said processed signal to provide near-field and far-field information about the structure, and to selectively use the gamma-ray portion of said processed signal to provide extended field information about the structure.
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Citations
93 Claims
- 1. A system for determining the location of a mass of radiolabelled tissue with respect to a reference point, the tissue having been provided with at least one radiolabelled tracer producing gamma-ray photons, characteristic x-ray photons, and an associated continuum of Compton-scattered photons, said system comprising radiation detecting means, signal processing means and signal analyzing means, said radiation detecting means being positionable to a location adjacent the radiolabelled tissue for detecting the photons emitted thereby and for providing an electrical signal representative of the received photons, said radiation detecting means and its position relative to the tissue establishing the reference point, said signal processing means utilizing said electrical signal to produce a processed electrical signal being representative of the number of photons detected as a function of their energies, said analyzing means being arranged for analyzing portions of said processed signal utilizing the known naturally occurring abundance of emitted photons of different energies represented by said processed signal for said at least one radiolabelled tracer as a reference factor in such analysis, whereupon said analysis of portions of said processed signal utilizing said reference factor establishes the location of the mass of radiolabelled tissue with respect to the reference point.
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41. A method for determining the location of a mass of radiolabelled tissue with respect to a reference point comprising:
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a) providing the tissue with at least one radiolabelled tracer that produces gamma-ray photons, characteristic x-ray photons, and an associated continuum of Compton scattered photons; b) providing radiation detecting means adjacent the tissue, detecting the photons therefrom, and for providing an electrical signal representative of the received photons; c) utilizing said radiation detecting means to establish said reference point; d) processing said electrical signal to produce a processed electrical signal representative of the number of photons detected as a function of their energies; and e) analyzing portions of said processed signal by utilizing the known naturally occurring abundance of emitted photons of different energies represented by said processed signal for said at least one radiolabelled tracer as a reference factor in such analysis, whereupon said analysis of portions of said processed signal utilizing said reference factor establishes the spatial coordinates of the mass of radiolabelled tissue with respect to the reference point. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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- 71. A system for the localization of a radiation detecting device used in nuclear medicine applications with tissue having been provided with at least one radiolabelled tracer producing gamma-ray photons, characteristic x-ray photons, and an associated continuum of Compton scattered photons, said system comprising a radiation detecting device and processing means, said radiation detecting device for receiving said gamma-ray photons characteristic x-ray photons, and Compton scattered photons and providing an electrical signal representative of the photons received thereby, said processing means being coupled to said radiation detecting means and arranged to establish a narrow energy window of no more than approximately 10 keV and no less than approximately 1 keV centered on the peak of the characteristic x-ray photons produced by the at least one radiolabelled tracer and excluding the peak of the gamma ray photons for providing an output signal representative of the photons received by said radiation detecting device within said narrow energy window.
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82. A method of positioning a radiation detecting device in a nuclear medicine application involving tissue having been provided with at least one radiolabelled tracer producing gamma-ray photons, characteristic x-ray photons, and an associated continuum of Compton scattered photons, said method comprising:
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(a) positioning a radiation detecting device in proximity with tissue having been provided with the at least one radiolabelled tracer; (b) receiving said gamma-ray photons, characteristic x-ray photons and Compton scattered photons with said device; (c) establishing a narrow energy window of no more than approximately 10 keV and no less than approximately 1 keV centered on the peak of the characteristic x-ray photons produced by the at least one radiolabelled tracer and excluding the peak of the gamma ray photons; and (d) providing an output signal representative of the photons received by said radiation detecting device within said narrow energy window. - View Dependent Claims (83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93)
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Specification