A Channel Multiplexing Method for Detector Signal Readout
A signal readout and detector technology, which is applied in the field of nuclear detection technology and nuclear medical imaging, can solve the problems of reducing electronic channels and large dynamic range of output signals, and achieve compact detectors, reduced complexity, and improved integration Effect
Active Publication Date: 2018-12-04
RAYCAN TECH CO LTD SU ZHOU
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[0005] In view of this, the purpose of the present invention is to provide a channel multiplexing method for detector signal readout, which can reduce the use of electronic channels, and can effectively solve the problem of excessive dynamic range of output signals after multiplexing of detector channels. big problem
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[0051] The invention discloses a channel multiplexing method for detector signal readout, which can effectively solve the problem that the dynamic range of the output signal after the multiplexing of the detector channels is too large.
[0052] Such as Figure 4 to Figure 5 As shown, the present invention discloses a channel multiplexing method for detector signal readout, which specifically includes steps:
[0053] S1: Divide L detector signals into M groups, the number of detectors in each group is at least 2, and the maximum is N, where the number of detector signals in group a is P(a), The bth detector signal of the ath group is marked as Signal(a,b), M≥2, N≥2, 1≤a≤M, 1≤b≤N;
[0054] S2: Divide the output signals of the detectors in step S1 into row source signals and column source signals, wherein the row source signals of the detectors in group a are summed to form row signals, and finally M groups form M rows signal, add the column source signals of the bth detector ...
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A channel multiplexing method for signal readout of an array detector, comprising: dividing the array detectors into M groups; the number of detectors in each group is at least 2; converting readout channels into M groups by means of row-column coding Row signals and N column signals are read out, that is, when the detectors in row a and column b have signal output, the signal in row a and the signal in column b have corresponding output; the signals read out by row and column are respectively connected to to different positions of the two transmission lines; use the time difference between the signal arriving at the two ends of the transmission line to determine the source row and column number of the signal, and use the two groups of time difference of the row and column signals to mark the source detector formed by the signal. The invention avoids the use of numerous electronic channels, reduces the cost of the electronic system and the difficulty of engineering realization; at the same time, because the use of the resistance weighting network is avoided in the process of channel multiplexing, the amplitude of the signal after multiplexing will not be affected by The access point of the signal varies greatly, which reduces the requirement for the dynamic range of the back-end readout circuit.
Description
technical field [0001] The invention relates to the fields of nuclear detection technology and nuclear medical imaging technology, in particular to a channel multiplexing method for detector signal readout. Background technique [0002] In a clinical positron emission tomography (Positron Emission Tomography, hereinafter referred to as PET) equipment, the number of detectors is as many as 30,000. Direct readout of the electrical signal produced by each detector requires 30,000 channels of electronic processing. The large number of electronic channels makes the entire PET electronic system expensive and difficult to implement. [0003] In response to the above situation, researchers focused on the research and development of channel multiplexing technology for detector signal readout. The current mainstream readout channel multiplexing method is to weight the output signal of the detector signal by row and column with a resistor network and then read it out. [0004] The u...
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IPC IPC(8): A61B6/03
CPCH04N25/671G01T1/164G01T1/2985
Inventor 奚道明刘祥刘苇曾晨谢庆国
Owner RAYCAN TECH CO LTD SU ZHOU