Method for Energy Calculation and Pileup Determination for Continuously Sampled Nuclear Pulse Processing
First Claim
1. An event processing module for a medical imaging device, comprising:
- an Applied Specific Integrated Circuit (ASIC) configured for receiving analog signals from at least one PMT and transmitting analog outputs, the ASIC comprising a Constant Fraction Discriminator (CFD);
an Analog to Digital Converter (ADC) configured for continuously sampling the analog outputs and transmitting digital outputs; and
a Field Programmable Gate Array (FPGA) configured to collect a number of samples of the digital output during a sampling period when triggered by the CFD;
wherein the ASIC, ADC, and FPGA are further configured to determine the energy of the analog signals from the at lease one PMT by subtracting a peak value of each signal from a baseline value of each signal, the peak value being determined as an average of at least one sample taken only around a peak during a sampling period, and the baseline value is determined as an average of at least one sample taken only around a beginning or end of the sampling period.
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Abstract
A method for processing events in a medical imaging device may comprise the steps of receiving analog signals from at least one PMT into an Applied Specific Integrated Circuit (ASIC) comprising a Constant Fraction Discriminator (CFD) and transmitting analog outputs from the ASIC. Further, sampling the analog outputs continuously using an Analog to Digital Converter (ADC) and transmitting digital outputs; and collecting a number of samples of the digital output during a sampling period using a Field Programmable Gate Array (FPGA) when triggered by the CFD. The method may additionally determine the energy of the analog signals from the at lease one PMT by subtracting the peak value of each signal from the baseline value of each signal, wherein the peak value is determined as an average of at least one sample taken only around the peak during the sampling period, and the baseline value is determined as an average of at least one sample taken only around the beginning or end of the sampling period.
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Citations
22 Claims
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1. An event processing module for a medical imaging device, comprising:
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an Applied Specific Integrated Circuit (ASIC) configured for receiving analog signals from at least one PMT and transmitting analog outputs, the ASIC comprising a Constant Fraction Discriminator (CFD); an Analog to Digital Converter (ADC) configured for continuously sampling the analog outputs and transmitting digital outputs; and a Field Programmable Gate Array (FPGA) configured to collect a number of samples of the digital output during a sampling period when triggered by the CFD; wherein the ASIC, ADC, and FPGA are further configured to determine the energy of the analog signals from the at lease one PMT by subtracting a peak value of each signal from a baseline value of each signal, the peak value being determined as an average of at least one sample taken only around a peak during a sampling period, and the baseline value is determined as an average of at least one sample taken only around a beginning or end of the sampling period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for processing events in a medical imaging device, comprising the steps of:
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receiving analog signals from at least one PMT into an Applied Specific Integrated Circuit (ASIC) comprising a Constant Fraction Discriminator (CFD) and transmitting analog outputs from the ASIC; sampling the analog outputs continuously using an Analog to Digital Converter (ADC) and transmitting digital outputs; collecting a number of samples of the digital output during a sampling period using a Field Programmable Gate Array (FPGA) when triggered by the CFD; and determining the energy of the analog signals from the at lease one PMT by subtracting the peak value of each signal from the baseline value of each signal, wherein the peak value is determined as an average of at least one sample taken only around the peak during the sampling period, and the baseline value is determined as an average of at least one sample taken only around the beginning or end of the sampling period. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. The method according to claim 13, wherein a plurality of PMT signals are multiplexed to n channels and fed to said ASIC and wherein said ASIC generates n output signals;
- wherein said ADC comprises n input channels and wherein said FPGA has n input channels.
- View Dependent Claims (22)
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21-1. A method for processing events in a medical imaging device, comprising the steps of:
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receiving n analog signals multiplexed from m detectors into an Applied Specific Integrated Circuit (ASIC) comprising a Constant Fraction Discriminator (CFD) and transmitting n analog outputs from the ASIC; sampling the n analog outputs continuously at 100 MHz using an Analog to Digital Converter (ADC) and transmitting n digital outputs; collecting 16 samples of the n digital outputs during a sampling period of 160 ns using a Field Programmable Gate Array (FPGA) when triggered by the CFD; and determining the energy of the n analog signals from the at lease one PMT by subtracting the peak value of each signal from the baseline value of each signal, wherein the peak value is determined as an average of the eighth and ninth samples taken around the peak during the sampling period, and the baseline value is determined as an average of the first and second samples taken around the beginning of the sampling period.
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Specification