Method for processing locating pulses supplied by a gamma camera and a gamma camera utilizing this method
First Claim
Patent Images
1. A method for processing locating pulses supplied by a gamma camera, comprising;
- detecting scintillations generated by the action of a gamma radiation in a scintillator crystal,amplifying and converting said detected scintillations into electrical contributions by a network of photomultiplier tubes,weighting and balancing said contributions by a set of matrices of resistors to establish balanced pulses with respect to a system of reference axes,the summing and integrating said balanced pulses in an integrator stage to generate the locating pulses,converting and standardizing said locating pulses by a calculator circuit into electrical signals representing the Cartesian coordinates of the location of the scintillations on the crystal, performing a standardization in the calculator circuit on the coordinate signals by dividing the substraction of two locating pulses along one coordinate axis by the sum of the same pulses along this axis, the same operation being performed for each reference axis.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a method for processing locating pulses supplied by a gamma camera and to a gamma camera utilizing this method. In accordance with the invention, locating pulses (X+,X-,Y+,Y-) are taken into account by a calculator circuit (12) which performs the standardization of an (X,Y) coordinate signal proportional to the difference of two locating pulses (X+ -X-) along an axis by the sum of these same two locating pulses (X+ +X-) along this axis.
32 Citations
3 Claims
-
1. A method for processing locating pulses supplied by a gamma camera, comprising;
-
detecting scintillations generated by the action of a gamma radiation in a scintillator crystal, amplifying and converting said detected scintillations into electrical contributions by a network of photomultiplier tubes, weighting and balancing said contributions by a set of matrices of resistors to establish balanced pulses with respect to a system of reference axes, the summing and integrating said balanced pulses in an integrator stage to generate the locating pulses, converting and standardizing said locating pulses by a calculator circuit into electrical signals representing the Cartesian coordinates of the location of the scintillations on the crystal, performing a standardization in the calculator circuit on the coordinate signals by dividing the substraction of two locating pulses along one coordinate axis by the sum of the same pulses along this axis, the same operation being performed for each reference axis.
-
- 2. A gamma camera equipped with a device for processing the locating pulses, comprising a collimator for focussing a gamma radiation which is to be measured on a scintillator crystal, a network of photomultiplier tubes for detection of the scintillations emitted by the scintillator and for amplification of the electrical contributions resulting from these detections, a set of matrices of resistors for balancing the electrical contributions and thereby for generating balanced pulses with respect to a system of reference axes, an intergrator stage for summing and integrating the balanced pulses and generating the said locating pulses, and a calculator cirucit for converting the locating pulses into electrical signals representing the Cartesian coordinates of the locations of the scintillations on the crystal, characterized in that the calculator circuit comprises standardization means for performing a standardization of the coordinate signals by dividing the subtraction of two locating pulses along one reference axis by the sum of the same locating pulses along this axis.
Specification