Position calculation and energy correction in the digital scintillation camera
First Claim
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1. A method of producing a position value signal in a scintillation camera having a scintillator, light detectors optically coupled to said scintillator for producing light detector signals, the method comprising the steps of:
- (a) determining from said light detector signals a center light detector receiving a maximum amount of light from a scintillation;
(b) selecting a group of light detectors surrounding said center light detector;
(c) calculating based on values from said group of surrounding light detectors a relative coordinate of a scintillation relative to said center light detector;
(d) providing a transformation value table for a matrix of positions of scintillations within a scope of each of said center light detectors; and
(e) transforming said relative coordinate of said scintillation using one of said transformation values from said table, said one of said transformation values having a position in said matrix corresponding to said coordinates, to obtain a value for generating said position value signal.
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Abstract
For accurate position calculation of scintillation events in a gamma camera, photodetector signals are processed based on small groups of photodetectors surrounding the scintillations. Relative position correction and energy correction is carried out based on rough position values relative to the group of photodetectors, taking into consideration the number of the center photodetector and the sum of all photodetector signals in the group.
49 Citations
14 Claims
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1. A method of producing a position value signal in a scintillation camera having a scintillator, light detectors optically coupled to said scintillator for producing light detector signals, the method comprising the steps of:
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(a) determining from said light detector signals a center light detector receiving a maximum amount of light from a scintillation; (b) selecting a group of light detectors surrounding said center light detector; (c) calculating based on values from said group of surrounding light detectors a relative coordinate of a scintillation relative to said center light detector; (d) providing a transformation value table for a matrix of positions of scintillations within a scope of each of said center light detectors; and (e) transforming said relative coordinate of said scintillation using one of said transformation values from said table, said one of said transformation values having a position in said matrix corresponding to said coordinates, to obtain a value for generating said position value signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing and filtering a position value signal in a scintillation camera having a scintillator, light detectors optically coupled to said scintillator for producing light detector signals, the method comprising the steps of:
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(a) determining from said light detector signals a center light detector receiving a maximum amount of light from a scintillation; (b) selecting a group of light detectors surrounding said center light detector; (c) calculating based on values from said group of surrounding light detectors relative coordinates of a scintillation relative to said center light detector; (d) calculating a sum of said light detector signals from said group of surrounding light detectors and from said center light detector; (e) providing an energy correction value table for a matrix of positions of scintillations within a scope of each of said center light detectors; (f) applying one of said correction values to said sum to obtain a corrected energy sum value, said one of said correction values having a position in said matrix corresponding to said coordinate of said scintillation; and (g) filtering said relative coordinates for each scintillation based on said corrected energy sum value. - View Dependent Claims (12, 13, 14)
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Specification