Gamma ray collimator
First Claim
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1. A gamma ray collimator assembly comprising a first collimator portion and a second collimator portion, said first and second portions having different gamma acceptance angles and being designed for operation with gamma rays of different energies.
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Abstract
A gamma ray collimator assembly comprising a first portion and a second collimator portion, the first and second portions having different gamma ray acceptance angles.
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Citations
75 Claims
- 1. A gamma ray collimator assembly comprising a first collimator portion and a second collimator portion, said first and second portions having different gamma acceptance angles and being designed for operation with gamma rays of different energies.
- 30. A gamma ray collimator assembly comprising a collimator portion, and an absorber portion, said absorber portion covering a substantially greater portion of the collimator assembly than the collimator portion wherein the collimator portion is designed to collimate gamma rays having a first, relatively low energy and wherein the absorber portion is designed to block gamma rays of said first energy and to pass gamma rays having a second, relatively higher energy.
- 42. A gamma ray collimator assembly for PET imaging comprising a collimator having a two dimensional array of acceptance apertures said apertures being formed at their edges of a material through which gamma rays used for PET imaging do not pass.
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49. A gamma ray imaging system, comprising:
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a) a gamma ray collimator assembly having a first collimator portion and a second collimator portion, said first and second portions having different acceptance angles and wherein the collimator portions are formed by spaced openings and wherein the openings are different for the two collimator portions; and
b) a gamma ray detector wherein said gamma ray collimator assembly is positioned adjacent a gamma ray acceptance surface of the detector;
wherein the first and second collimator portions are designed for operation with different energies. - View Dependent Claims (50, 51, 52)
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53. Gamma ray imaging apparatus comprising more than one gamma ray imaging system having first and second collimator portions designed for operation with gamma rays of different energies.
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54. Apparatus comprising:
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a) a line source having a given width and length; and
b) a collimator having a plurality of apertures formed therein opposite to the line source, wherein said apertures are narrower than the line source width and are distributed in the direction of the width of the line source. - View Dependent Claims (55)
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56. A method of improving depth discrimination in PET measurements comprising:
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a) providing an area detector; and
b) providing a collimator at the detector that blocks gamma photons having an incident transaxial angle larger than a predetermined value. - View Dependent Claims (57)
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58. A method of performing attenuation and coincidence measurements sequentially comprising:
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a) providing a plurality of area detectors;
b) providing at least one collimator, covering a portion of at least one detector of said plurality of detectors;
c) irradiating a patient with gamma radiation from a source positioned opposite the at least one detector;
d) collimating a flux of the gamma radiation passing through the patient from the source;
e) detecting the collimated flux utilizing the portion of the at least one area detector covered by the collimator;
f) determining a two dimensional attenuation map of at least a portion of the patient from the detected flux; and
g) performing a PET imaging sequence without removing the collimator.
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59. Dual energy imaging apparatus for simultaneous imaging of relatively low energy and relatively high energy photons emitted by sources of radiation, comprising:
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at least one detector which produces signals responsive to high and low energy events throughout a given time period;
a collimator situated between a detector of the at least one detectors and a source of high and low energy photons, wherein the collimator collimates the low energy photons and is relatively transparent to the high energy photons;
a dual energy detector, which receives the signals and determines therefrom whether the signal was generated by a relatively low energy photon or a relatively high energy photon;
an image processing system that separately processes the high energy signals and the low energy signals to produce images based on the detected high energy and low energy photon. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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73. A hybrid collimator for collimating high energy photons and low energy photons in gamma cameras, comprising:
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a first collimator which collimates low energy photons and is relatively transparent to high energy photons; and
a second collimator that collimates high energy photons wherein one of the first and second collimators underlies the other of the first and second collimators. - View Dependent Claims (74, 75)
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Specification
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Current AssigneeELGEMS Ltd (GE Aerospace)
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Original AssigneeELGEMS Ltd (GE Aerospace)
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InventorsWainer, Naor, Ohana, Israel, Hermony, Natan, Hefetz, Yaron, Maor, Dov, Berlad, Gideon
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Primary Examiner(s)Hannaher, Constantine
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Application NumberUS09/129,078Time in Patent Office1,098 DaysField of Search250/363.04, 250/363.05, 250/363.1, 250/363.03, 250/362, 250/503.1, 250/505.1, 378/145, 378/147, 378/149US Class Current250/363.03CPC Class CodesG21K 1/02 using diaphragms, collimators
