CN109597114A - A kind of detector signal reading circuit, detector and signal processing method - Google Patents
A kind of detector signal reading circuit, detector and signal processing method Download PDFInfo
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- CN109597114A CN109597114A CN201811306133.6A CN201811306133A CN109597114A CN 109597114 A CN109597114 A CN 109597114A CN 201811306133 A CN201811306133 A CN 201811306133A CN 109597114 A CN109597114 A CN 109597114A
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
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- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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Abstract
The invention discloses detector signal reading circuits, detector and signal processing method, the cathode signal output end of every a line SiPM pixel of SiPM array connects to form M row connects end altogether, the anode signal output end of each column SiPM pixel connects to form N number of column connects end altogether, each row connects end altogether and column connects end altogether are connected with signal read circuit, in the case where SiPM array is in Geiger mode angular position digitizer, signal read circuit may filter that out the AC signal of every row and each column, M row signal read circuit can be weighted summation to M row cathode AC signal and obtain two row signals, N column signal reading circuit can be weighted summation to N column anode AC signal and obtain two column signals, to row in the present invention, the setting of the weight coefficient of sub-circuit in column, so that based on row, the position for the scintillation crystal that column signal is obtained by gravity model appoach The coordinate precision set is higher, and does not need a large amount of shunt resistance and analogue amplifier, reduces the electronics complexity of circuit and reads plate suqare.
Description
Technical field
The present invention relates to technical field of photoelectric detection more particularly to a kind of detector signal reading circuits, detector and letter
Number processing method.
Background technique
Silicon photomultiplier (SiPM, Silicon Photomultipliers) is common photodetection a kind of in recent years
Device, for nuclear medicine positron emission computerized tomography imaging (Positron Emission Tomography, PET) and nuclear physics
Research etc..
Current pet detector research hotspot is high performance position sensitive detector, generallys use SiPM array, signal
Reading circuit and scintillation crystal array are constituted.The principle of position sensitive detector is by scintillation light in scintillation crystal at SiPM gusts
The center of gravity being distributed in column determines the specific location of crystal.Since the port number of SiPM array is usually more, using independent reading side
Method will cause electronics complexity and cost is very high, mainly have discrete location method currently based on the signal reading method of SiPM array
With Charge Division Method two types.Two methods respectively have superiority and inferiority: Charge Division Method has better time performance and positioning accuracy,
However its electronics complexity is still very high；The electronics complexity of discrete location method is very low, however its time performance is very poor, fixed
Position precision is also slightly worse than Charge Division Method.
Summary of the invention
The embodiment of the present invention provides a kind of detector signal reading circuit, detector and signal processing method, reads reducing
Good timeliness and positioning accuracy are also ensured while the electronics complexity of circuit out.
First aspect of the embodiment of the present invention provides a kind of detector signal reading circuit, the detector signal reading circuit packet
It includes: isolation resistance, silicon photomultiplier (SiPM) array for taking signal resistance, signal read circuit and M row N column；
Every a line of the SiPM array has N number of SiPM pixel, and each column of the SiPM array have M SiPM picture
Element, the cathode signal output end of N number of SiPM pixel of every a line connects to form M row connects end altogether in the SiPM array,
The anode signal output end of the M SiPM pixels of each column connects to form N number of column connects end altogether in the SiPM array；
The signal read circuit includes two sub-circuits, and the signal read circuit has an input terminal and two
Output end, described two output ends are respectively the output end of two sub-circuits in signal read circuit, and each row connects altogether
End connects one to one with the input terminal of a signal read circuit, each column connects end altogether and signal read circuit
Input terminal connects one to one；
An output end of each signal read circuit is joined together to form the first cathode signal in M row signal read circuit
Output end, another output are joined together to form the second cathode signal output end, and the signal read circuit is for being isolated
Be transferred to the direct current signal of its input terminal, filter out from its input terminal input AC signal, and by it includes two strips
Circuit is weighted the AC signal filtered out, the weight system of M sub-circuit of the first cathode signal output end connection
Number is sequentially increased or is sequentially reduced according to the sequence that the row serial number of the M row signal read circuit increases, and believes according to the M row
The sequence that the row serial number of number reading circuit increases, the weight coefficient of M sub-circuit of the second cathode signal output end connection,
The weight coefficient of the M sub-circuit connected with the first cathode signal output end is arranged symmetrically；
An output end of each signal read circuit is joined together to form first anode signal in N column signal reading circuit
Output end, another output are joined together to form second plate signal output end, and the signal read circuit is for being isolated
Be transferred to the direct current signal of its input terminal, filter out from its input terminal input AC signal, and by it includes two strips
Circuit is weighted the AC signal filtered out, the weight system of N number of sub-circuit of the first anode signal output end connection
Number is sequentially increased or is sequentially reduced according to the sequence that the column serial number of the N column signal reading circuit increases, according to the N column signal
The sequence that the column serial number of reading circuit increases, the weight coefficient of N number of sub-circuit of the second plate signal output end connection, and
The weight coefficient of N number of sub-circuit of the first anode signal output end connection is arranged symmetrically；
Each row connects end altogether connects one to one with an isolation resistance, each column connects end altogether with one
It is described that signal resistance is taken to connect one to one；The case where the reverse bias voltage applied to the SiPM array is positive voltage
Under, the other end for the isolation resistance connecting with the row connects end altogether is joined together to form common cathode, the reverse bias voltage
Applied by the common cathode, connect with the column connects end altogether described in take the other end of signal resistance to be grounded；To described
In the case that the reverse bias voltage that SiPM array applies is negative voltage, the isolation resistance that is connect with the row connects end altogether it is another
End ground connection, the other end for taking signal resistance connecting with the column connects end altogether is joined together to form common-anode, described reversed inclined
Voltage is set to apply by the common-anode.
Second aspect of the embodiment of the present invention provides a kind of detector, which includes such as above-mentioned pet detector signal
Reading circuit.
The third aspect of the embodiment of the present invention provides a kind of signal processing method, which is applied to as described above
Detector signal reading circuit or pet detector as described above, the signal processing method include:
When the SiPM array of the detector signal reading circuit works under Geiger mode angular position digitizer, the SiPM array
In the SiPM pixel of every a line the cathode signal of itself is exported to the row connects end altogether of the row, while the SiPM picture of each column
Element exports the anode signal of itself to the column connects end altogether of the column；
The signal read circuit of every row filters out the cathode signal of exchange, each column from the cathode signal that row connects end altogether exports
Signal read circuit the anode signal of exchange is filtered out from the anode signal that column connects end altogether exports；
The signal read circuit of M row is weighted summation process to the cathode signal filtered out, obtains from first yin
First cathode signal X1 of pole signal output end output and the second cathode signal exported from the second cathode signal output end
The signal read circuit of X2, N column is weighted summation process to the anode signal filtered out, obtains from the first anode signal
The first anode signal Y1 of the output end output and second plate signal Y2 exported from the second plate signal output end.
The embodiment of the present invention provides a kind of detector signal reading circuit, detector and signal processing method, the present embodiment
In, the cathode signal output end of every a line SiPM pixel of SiPM array connects to form M row connects end altogether, each column SiPM pixel
Anode signal output end connect to form N number of column connects end altogether, each row connects end altogether and column connects end altogether are connected with signal read circuit,
In the case where SiPM array is in Geiger mode angular position digitizer, signal read circuit may filter that out the AC signal of every row and each column, and exchange M row
Cathode signal be weighted summation and obtain two row signals, summation is weighted to the anode signal of N column exchange and obtains two
Column signal, to the setting of the weight coefficient of the sub-circuit in row, column in the embodiment of the present invention, so that the present embodiment is based on row, column
The coordinate precision of the position of the scintillation crystal for the generation event that signal is calculated by gravity model appoach is higher, and does not need a large amount of
Shunt resistance and analogue amplifier reduce the electronics complexity of circuit and read plate suqare.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of detector signal reading circuit in the embodiment of the present invention；
Fig. 2 is a kind of flow diagram of signal processing method in the embodiment of the present invention.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present embodiment provides a kind of detector signal reading circuits, referring to Fig. 1, the detector signal reading circuit include every
From resistance 11 (not marking completely in Fig. 1), take signal resistance 12 (not marking completely in Fig. 1), signal read circuit 13 (in Fig. 1
Be made of 131 and 132) and M row N column silicon photomultiplier array 14 (SiPM array shown in Fig. 1 have 4 rows 4 column, be total to
There are 16 SiPM pixel S1-S16, but it is understood that, the row, column number of SiPM array is not limited by Fig. 1 in practice)；
Wherein, every a line of SiPM array has N number of SiPM pixel, and each column of SiPM array have M SiPM pixel,
The cathode signal output end of N number of SiPM pixel of every a line connects to form M row connects end altogether a in SiPM array, described
The anode signal output end of the M SiPM pixels of each column connects to form N number of column connects end altogether b in SiPM array；
Signal read circuit 13 includes two sub-circuits 131, and signal read circuit has an input terminal and two outputs
End, the two output ends are respectively the output end of two sub-circuits 131 in signal read circuit, each row connects end altogether a
It connects one to one with the input terminal of a signal read circuit, each column connects end altogether b and signal read circuit
Input terminal connects one to one；
An output end of each signal read circuit is joined together to form the first cathode letter in M row signal read circuit 13
Number output end 1311, another output are joined together to form the second cathode signal output end 1312, and the signal reads electricity
Road 13 filters out the AC signal inputted from its input terminal, and pass through it for the direct current signal for being transferred to its input terminal to be isolated
Two sub-circuits for including are weighted the AC signal filtered out, and export after weighting, and first cathode signal is defeated
Outlet 1311 connect M sub-circuit weight coefficient according to the sequence that the row serial number of the M row signal read circuit increases and
It is sequentially increased or is sequentially reduced, according to the sequence that the row serial number of the M row signal read circuit increases, second cathode signal
The M sub-circuit that the weight coefficient for the M sub-circuit that output end 1312 connects is connected with the first cathode signal output end
Weight coefficient is arranged symmetrically；
An output end of each signal read circuit is joined together to form first anode letter in N column signal reading circuit 13
Number output end 1313, another output are joined together to form second plate signal output end 1314, and the signal reads electricity
Road filters out the AC signal inputted from its input terminal, and wrap by it for the direct current signal for being transferred to its input terminal to be isolated
Two sub-circuits contained are weighted the AC signal filtered out, and the AC signal after weighting after output weighting, described
The weight coefficient for N number of sub-circuit that first anode signal output end 1313 connects is according to the column sequence of the N column signal reading circuit
Number increase sequence be sequentially increased or be sequentially reduced, according to the N column signal reading circuit column serial number increase sequence, it is described
The weight coefficient and the first anode signal output end 1313 for N number of sub-circuit that second plate signal output end 1314 connects
The weight coefficient of N number of sub-circuit of connection is arranged symmetrically；
Each row connects end altogether a connects one to one with an isolation resistance 11, each column connects end altogether with
Signal resistance 12 is taken to connect one to one described in one；It is positive voltage in the reverse bias voltage applied to the SiPM array
In the case of, the other end for the isolation resistance 11 being connect with the row connects end altogether be joined together to form common cathode (as shown in Figure 1,
Common cathode VBias), reverse bias voltage is applied by the common cathode, described other end ground connection (such as Fig. 1 for taking signal resistance 12
It is shown)；In the case where the reverse bias voltage applied to the SiPM array is negative voltage, with being isolated for row connects end altogether connection
The other end of resistance is grounded (not shown in figure 1), and the other end for taking signal resistance connecting with column connects end altogether links together shape
At common-anode (not shown in figure 1), reverse bias voltage is applied by the common-anode.
In practice, it generally uses the mode of common cathode or common-anode to input reverse bias voltage for SiPM array, makes
SiPM array array works under Geiger mode angular position digitizer, in order to avoid the reverse bias voltage of every a line has an impact other rows, this
The reverse bias voltage of every a line is isolated using isolation resistance 11 for inventive embodiments.The resistance value of the isolation resistance can be according to detection
The scale of SiPM array and other actual conditions of circuit determine in device signal read circuit, and the present embodiment does not limit this
It is fixed.
Below with reference to the circuit diagram in Fig. 1 to the relationship of the weight coefficient of the sub-circuit in detector signal reading circuit into
Row explanation.
According to the signal read circuit of the signal read circuit of the first row uppermost from Fig. 1 to nethermost fourth line
Sequence, the first cathode signal output end 1311 connection 4 row sub-circuits from the first row to the end a line weight coefficient present
Monotonicity variation, i.e. the weight system of 4 row sub-circuits of the first cathode signal output end 1311 connection from the first row a line to the end
Number is sequentially increased or is sequentially reduced, and 4 row sub-circuits of the second cathode signal output end 1312 connection are from the first row to last one
Weight system of the 4 row sub-circuits that capable weight coefficient is connect with the first cathode signal output end 1311 from the first row a line to the end
Number is symmetrically arranged, the i.e. weight system of the first row sub-circuit in 4 row sub-circuits of the second cathode signal output end 1312 connection
Number is equal with the weight coefficient of last line sub-circuit in the 4 row sub-circuits that the first cathode signal output end 1311 connects, and second
The weight coefficient and the first cathode signal output end of second row sub-circuit in the 4 row sub-circuits that cathode signal output end 1312 connects
The weight coefficient of row sub-circuit second from the bottom is equal in 4 row sub-circuits of 1311 connections, and the second cathode signal output end 1312 connects
It is reciprocal in the 4 row sub-circuits that the weight coefficient of the third line is connect with the first cathode signal output end 1311 in the 4 row sub-circuits connect
The weight coefficient of the third line is equal, and so on, for the array of M*N, the first cathode signal output end
The weight coefficient of the sub-circuit of the weight coefficient and the second cathode signal output end 1312 connection of the sub-circuit of 1311 connections is also full
The above-mentioned similar relationship of foot.
According to the signal read circuit of the 4th of the signal read circuit of the first row of the leftmost side from Fig. 1 to the rightmost side the column
Sequence, first anode signal output end 1313 connect 4 column sub-circuits from first row to it is last one column weight coefficient present
The 4 column sub-circuits that monotonicity variation, i.e. first anode signal output end 1313 connect are from first row to the weight system of a last column
Number is sequentially increased or is sequentially reduced, and the 4 column sub-circuits that second plate signal output end 1314 connects are from first row to last one
The 4 column sub-circuits that the weight coefficient of column is connect with first anode signal output end 1313 are from first row to the weight system of a last column
Number is symmetrically arranged, the i.e. weight coefficient and the of the first rows of 4 column sub-circuits that connects of second plate signal output end 1314
The weight coefficient of last column of 4 column sub-circuits of one anode signal output end 1313 connection is equal, and second plate signal is defeated
4 column that the weight coefficient of the secondary series for the 4 column sub-circuits that outlet 1314 connects is connect with first anode signal output end 1313
The weight coefficient of the column second from the bottom of circuit is equal, and the third for the 4 column sub-circuits that second plate signal output end 1314 connects
The weight coefficient phase of the secondary series for the 4 column sub-circuits that the weight coefficient of column is connect with first anode signal output end 1313
Deng, and so on.The sub-circuit connected for the SiPM array of M*N, first anode signal output end 1313
The weight coefficient of sub-circuit that connects of weight coefficient and second plate signal output end 1314 also meet above-mentioned similar relationship.
In the present embodiment, signal read circuit can be using resistance weighting or capacitor weighting.
Optionally, in one example, the scheme weighted using resistance, signal read circuit further includes capacitance 132,
The input terminal of two sub-circuits 131 of the signal read circuit links together, and capacitance 132 is connected to the signal and reads
Out between the input terminal of circuit and the input terminal of the sub-circuit 131, the input terminal of every sub-circuit of signal read circuit and
Weighting resistor is provided between output end；
The weighting resistor resistance value of M sub-circuit of the first cathode signal output end connection reads electricity according to the M row signal
The sequence that the row serial number on road increases is sequentially increased or is sequentially reduced；Increase according to the row serial number of the M row signal read circuit
Sequentially, the weighting resistor resistance value and first cathode signal of M sub-circuit of the second cathode signal output end connection are defeated
The weighting resistor resistance value of M sub-circuit of outlet connection is arranged symmetrically.
For example, with reference to Fig. 1, for 4 sub-circuits of the first cathode signal output end 1311 connection, from the first row sub-circuit
A line sub-circuit to the end, weighting resistor is respectively R1, R2, R3 and R4, for the 4 of the connection of the second cathode signal output end 1312
A sub-circuit, from the first row sub-circuit, a line sub-circuit, weighting resistor are respectively R4, R3, R2 and R1, the resistance of R1-R4 to the end
Value variation has monotonicity, such as R1 to R4 is sequentially increased or R1 to R4 is sequentially reduced.
The weighting resistor resistance value of N number of sub-circuit of first anode signal output end connection reads electricity according to the N column signal
The sequence that the column serial number on road increases is sequentially increased or is sequentially reduced；Increase according to the column serial number of the N column signal reading circuit
Sequentially, the weighting resistor resistance value of N number of sub-circuit of the second plate signal output end connection and the first anode signal are defeated
The weighting resistor resistance value of N number of sub-circuit of outlet connection is arranged symmetrically.
For example, still referring to Fig. 1, for 4 sub-circuits that first anode signal output end 1313 connects, from first row
For circuit to last column sub-circuit, weighting resistor is respectively R4, R3, R2 and R1, and second plate signal output end 1314 is connected
4 sub-circuits connect, from first row sub-circuit to last column sub-circuit, weighting resistor is respectively R1, R2, R3 and R4, R1-R4
Change in resistance there is monotonicity, such as R1 to R4 is sequentially increased or R1 to R4 is sequentially reduced.
Optionally, the inverse of the weighting resistor resistance value of M sub-circuit of the first cathode signal output end connection, according to
The sequence that the row serial number of the M row signal read circuit increases is in arithmetic progression；The N of the first anode signal output end connection
The inverse of the weighting resistor resistance value of a sub-circuit is in equal difference according to the sequence that the column serial number of the N column signal reading circuit increases
Ordered series of numbers.
For example, still referring to Fig. 1, for the weighting resistor of 4 sub-circuits of the first cathode signal output end 1311 connection
R1, R2, R3 and R4, the inverse of their resistance value are in arithmetic progression, such asFor second
Weighting resistor R1, R2, R3 and the R4 for 4 sub-circuits that anode signal output end 1314 connects, the inverse of their resistance value in etc.
Difference series, such asIt is understood that above-mentioned arithmetic progression only illustrates,
Limitation is not generated to the ratio of weighting resistor resistance value inverse in the present embodiment.
Referring to Fig. 1, in the scheme of resistance weighting, the row connects end altogether of every a line of the SiPM array of the present embodiment with one
One end of capacitance connects, and the column connects end altogether of each column is connect wherein with one end of a capacitance, connection of not going together
The capacitance of capacitance can be identical, and the capacitance of the capacitance of different lines connection can be identical, in the present embodiment, blocking
The capacitance of capacitor can be arranged according to the actual needs of detector signal reading circuit, to capacitance in the present embodiment
Capacitance does not limit.
In one example, the scheme weighted using capacitor, the input terminal connection of two sub-circuits of signal read circuit
Input terminal as the signal read circuit together, the input terminal of every sub-circuit of the signal read circuit and output
Weighted capacitance is provided between end.Alternatively, in one example, the input terminal and row connects end altogether and column of signal read circuit are altogether
It connects and can connect one 0 ohm of resistance between end.
The weighted capacitance value of M sub-circuit of the first cathode signal output end connection, according to the row of M row signal read circuit
The sequence that serial number increases is sequentially increased or is sequentially reduced, according to the sequence that the row serial number of M row signal read circuit increases, the second yin
The M sub-circuit that the weighted capacitance value of M sub-circuit of pole signal output end connection is connected with the first cathode signal output end
Weighted capacitance value is arranged symmetrically；
The weighted capacitance value of N number of sub-circuit of first anode signal output end connection, according to the column of N column signal reading circuit
Serial number increase sequence be sequentially increased or be sequentially reduced, according to the column serial number of institute N column signal reading circuit increase sequence, second
The weighted capacitance value of N number of sub-circuit of anode signal output end connection, and the N number of son electricity being connect with first anode signal output end
The weighted capacitance value on road is arranged symmetrically.
For example, the R1 in Fig. 1 is replaced with C1, R2 is replaced with into C2, R 3 is replaced with into C3, with this
Analogize, then for 4 sub-circuits of the first cathode signal output end 1311 connection, from the first row sub-circuit, a line is electric to the end
Road, weighted capacitance are respectively C1, C2, C3 and C4, for 4 sub-circuits of the second cathode signal output end 1312 connection, from the
A line sub-circuit a line sub-circuit to the end, weighted capacitance is respectively C4, C3, C2 and C1, for first anode signal output end
1313 connection 4 sub-circuits, from first row sub-circuit to last column sub-circuit, weighted capacitance be respectively C4, C3, C2 and
C1, for 4 sub-circuits that second plate signal output end 1314 connects, from first row sub-circuit to last column sub-circuit,
Weighted capacitance is respectively C1, C2, C3 and C4.Wherein, the capacitance variation of C1-C4 has monotonicity, such as weighted capacitance C1 is arrived
The capacitance of C4 is sequentially increased or is sequentially reduced.
Optionally, the weighted capacitance value of M sub-circuit of the first cathode signal output end connection, reads according to M row signal
The sequence that the row serial number of circuit increases is in arithmetic progression；The weighted capacitance of N number of sub-circuit of first anode signal output end connection
Value is in arithmetic progression according to the sequence that the column serial number of N column signal reading circuit increases.
For example, C1:C2:C3:C4=1:2:3:4.
In one example, when by the way of common cathode input reverse bias voltage, in order to avoid power supply shakiness
Detector signal reading circuit is adversely affected, optionally, the common cathode and the isolation resistance of every a line it
Between be connected with one ground connection filter capacitor.The capacitance of the filter capacitor of the ground connection can be with the capacitance phase of capacitance
Together.
Optionally, the SiPM array of the present embodiment could alternatively be GAPD (geiger-mode avalanche photo
Diode, Geiger mode avalanche diode) array.
Further, the present embodiment also provides a kind of pet detector, including detectable signal reading circuit as described above.
In the present embodiment, when inputting reverse bias voltage by common cathode or common-anode, so that the work of SiPM array is being covered
Under leather mode, if having scintillation crystal to interact with ray in SiPM array, then AC signal can be generated from the flashing
The cathode and anode of SiPM where crystal export, the above-mentioned detectable signal reading circuit based on the present embodiment, may be implemented pair
The accurate positioning of scintillation crystal.
Further, the present embodiment also provides a kind of signal processing method, which is applied to as described above
Detector signal reading circuit or pet detector, as shown in Fig. 2, the signal processing method includes:
Step 201, when the SiPM array of detector signal reading circuit works under Geiger mode angular position digitizer, it is every in SiPM array
The SiPM pixel of a line exports the cathode signal of itself to the row connects end altogether of the row, at the same the SiPM pixel of each column by itself
Anode signal export to the column connects end altogether of the column；
Optionally, positive voltage (as shown in Figure 1) can be applied by the common cathode to detector signal reading circuit, or
The mode for applying negative voltage to the common-anode of detector signal reading circuit, so that the SiPM pixel operation of SiPM array is in Geiger
Under mode.
Step 202, every row signal read circuit the cathode of exchange is filtered out from the cathode signal that row connects end altogether exports
Signal, the signal read circuit of each column filter out the anode signal of exchange from the anode signal that column connects end altogether exports；
As shown in Figure 1, under the scheme of weighting resistor, capacitance achievees the effect that separated by direct communication, every row or each column
AC signal enters corresponding sub-circuit by capacitance.
Step 203, M row signal read circuit summation process is weighted to the cathode signal filtered out, obtain from
First cathode signal X1 of one cathode signal output end output and the second cathode signal exported from the second cathode signal output end
The signal read circuit of X2, N column is weighted summation process to the anode signal filtered out, obtains exporting from first anode signal
The second plate signal Y2 for holding the first anode signal Y1 of output and being exported from second plate signal output end.
By taking the circuit of Fig. 1 as an example, in step 203, four cathode AC signals of four row connects end altogethers output pass through signal
After the weighted sum of reading circuit, coding becomes 2 row related signals X1 and X2, and four anodes of four column connects end altogethers output are handed over
Signal is flowed after the weighted sum of space signal read circuit, and coding becomes 2 column coherent signals Y1 and Y2.
The present embodiment is according to the sun of the first cathode signal X1 and the second cathode signal X2 and first anode signal Y1 and second
Pole signal Y2 can relatively accurately calculate the position of the scintillation crystal of generation event, wherein a ray and scintillation crystal are sent out
Raw interaction is referred to as an event.The ray can be gamma ray or other types of ray, the present embodiment do not have this
There is restriction.
In one example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is read according to M row signal
The row serial number of circuit is sequentially increased out sequence and be sequentially increased, and the weight of the sub-circuit of first anode signal output end connection
Coefficient is sequentially increased according to the sequence that the column serial number of N column signal reading circuit is sequentially increased, then is calculated according to formula below
The scintillation crystal of generation event in the position of SiPM array,
Wherein, the origin of coordinate system is the SiPM pixel of the first row first row in SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, the x in formula are that the scintillation crystal of generation event is being sat
The coordinate in the x-axis of system is marked, y is coordinate of the scintillation crystal of generation event in the y-axis of coordinate system；
By taking the circuit in Fig. 1 as an example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is from a line
It is sequentially increased to fourth line (counting from top to bottom), and the weight coefficient of the sub-circuit of first anode signal output end connection is from first
It arranges to the 4th column (counting from left to right) and is sequentially increased, then SiPM pixel (S1 in Fig. 1) of the coordinate origin in the first row first row
On, in Fig. 1, the direction of X1 to X2 is the direction of x-axis, and the direction of Y2 to Y1 is the direction of y-axis.
In one example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is read according to M row signal
The row serial number of circuit is sequentially increased out sequence and be sequentially reduced, the weight system of the sub-circuit of first anode signal output end connection
Number is sequentially increased according to the sequence that the column serial number of N column signal reading circuit is sequentially increased, then is calculated and sent out according to formula below
Make trouble part scintillation crystal in the position of SiPM array；
Wherein, the origin of coordinate system is the SiPM pixel of M row first row in SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, x is x of the scintillation crystal in coordinate system of generation event
Coordinate on axis, y are coordinate of the scintillation crystal of generation event in the y-axis of coordinate system；
By taking the circuit in Fig. 1 as an example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is from a line
It is sequentially reduced to fourth line (counting from top to bottom), and the weight coefficient of the sub-circuit of first anode signal output end connection is from first
It arranges to the 4th column (counting from left to right) and is sequentially increased, then SiPM pixel (S13 in Fig. 1) of the coordinate origin in fourth line first row
On, in Fig. 1, the direction of X2 to X1 is the direction of x-axis, and the direction of Y2 to Y1 is the direction of y-axis.
In one example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is read according to M row signal
The row serial number of circuit is sequentially increased out sequence and be sequentially increased, the weight system of the sub-circuit of first anode signal output end connection
Number is sequentially reduced according to the sequence that the column serial number of N column signal reading circuit is sequentially increased, then is calculated and sent out according to formula below
Make trouble part scintillation crystal in the position of SiPM array, wherein ray and scintillation crystal occur interaction and are referred to as one
A event；
Wherein, the origin of coordinate system is the SiPM pixel of the first row Nth column in SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, x is x of the scintillation crystal in coordinate system of generation event
Coordinate on axis, y are coordinate of the scintillation crystal of generation event in the y-axis of coordinate system；
By taking the circuit in Fig. 1 as an example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is from a line
It is sequentially increased to fourth line (counting from top to bottom), and the weight coefficient of the sub-circuit of first anode signal output end connection is from first
It arranges to the 4th column (counting from left to right) and is sequentially reduced, then the SiPM pixel (S4 in Fig. 1) that coordinate origin is arranged in the first row the 4th
On, in Fig. 1, the direction of X1 to X2 is the direction of x-axis, and the direction of Y1 to Y2 is the direction of y-axis.
In one example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is read according to M row signal
The row serial number of circuit is sequentially increased out sequence and be sequentially reduced, the weight system of the sub-circuit of first anode signal output end connection
Number is sequentially reduced according to the sequence that the column serial number of N column signal reading circuit is sequentially increased, then is calculated and sent out according to formula below
Make trouble part scintillation crystal in the position of SiPM array, wherein ray and scintillation crystal occur interaction and are referred to as one
A event；
Wherein, the origin of coordinate system is the SiPM pixel of M row Nth column in SiPM array；The direction of x-axis is described first
The direction that the weight coefficient of M sub-circuit of cathode signal output end connection increases, the direction of y-axis are the first anode signal
The direction that the weight coefficient of N number of sub-circuit of output end connection increases, x is x-axis of the scintillation crystal in coordinate system of generation event
On coordinate, y is coordinate of the scintillation crystal in the y-axis of coordinate system of generation event.
By taking the circuit in Fig. 1 as an example, if the weight coefficient of the sub-circuit of the first cathode signal output end connection is from a line
It is sequentially reduced to fourth line (counting from top to bottom), and the weight coefficient of the sub-circuit of first anode signal output end connection is from first
It arranges to the 4th column (counting from left to right) and is sequentially reduced, then the SiPM pixel (S16 in Fig. 1) that coordinate origin is arranged in fourth line the 4th
On, in Fig. 1, the direction of X2 to X1 is the direction of x-axis, and the direction of Y1 to Y2 is the direction of y-axis.
Optionally, in the present embodiment, because ray and scintillation crystal interaction generate on detector signal reading circuit
ENERGY E indicate are as follows: E=EX1+EX2+EY1+EY2, wherein EX1 be signal X1 energy, EX2 be signal X2 energy, EY1
For the energy of signal Y1, EY2 is the energy of signal Y2.
The detector signal reading circuit of the present embodiment it is simpler, can be effectively reduced read plate suqare and power consumption,
Advantageously reduce the cost of the electronic circuit of the circuit and rear end that read X1, X2, Y1 and Y2 signal.Believed based on the detector
Number reading circuit, the cathode signal of every row and the anode signal of each column can be read simultaneously, and ensure that time performance, the present embodiment
The setting of weight coefficient based on the sub-circuit to signal read circuit, so that obtained based on row, column signal by gravity model appoach
The coordinate precision of the position of scintillation crystal is higher, promotes the positioning accuracy to scintillation crystal, promotes user experience.
In several embodiments provided herein, it should be understood that disclosed devices, systems, and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the division of module,
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple module or components can be with
In conjunction with or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or module or
Communication connection can be electrical property, mechanical or other forms.
Module may or may not be physically separated as illustrated by the separation member, show as module
Component may or may not be physical module, it can and it is in one place, or may be distributed over multiple networks
In module.Some or all of the modules therein can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, each functional module in each embodiment of the present invention can integrate in a processing module
It is that modules physically exist alone, can also be integrated in two or more modules in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.
It should be noted that for the various method embodiments described above, describing for simplicity, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because
According to the present invention, certain steps can use other sequences or carry out simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related actions and modules might not all be this hair
Necessary to bright.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.
The above are retouch to a kind of detector signal reading circuit provided by the present invention, detector and signal processing method
It states, for those skilled in the art, thought according to an embodiment of the present invention can in specific embodiments and applications
There is change place, to sum up, the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of detector signal reading circuit characterized by comprising isolation resistance takes signal resistance, signal read circuit
With silicon photomultiplier (SiPM) array of M row N column；
Every a line of the SiPM array has N number of SiPM pixel, and each column of the SiPM array have M SiPM pixel,
The cathode signal output end of N number of SiPM pixel of every a line connects to form M row connects end altogether in the SiPM array, described
The anode signal output end of the M SiPM pixels of each column connects to form N number of column connects end altogether in SiPM array；
The signal read circuit includes two sub-circuits, and the signal read circuit has an input terminal and two outputs
End, described two output ends are respectively the output end of two sub-circuits in signal read circuit, each row connects end altogether with
The input terminal of one signal read circuit connects one to one, the input of each the column connects end altogether and a signal read circuit
End connects one to one；
An output end of each signal read circuit is joined together to form the output of the first cathode signal in M row signal read circuit
End, another output are joined together to form the second cathode signal output end, and the signal read circuit is for being isolated transmission
To the direct current signal of its input terminal, filter out from its input terminal input AC signal, and by it includes two sub-circuits
The AC signal filtered out is weighted, the weight coefficient root of M sub-circuit of the first cathode signal output end connection
It is sequentially increased or is sequentially reduced according to the sequence that the row serial number of the M row signal read circuit increases, read according to the M row signal
The sequence that the row serial number of circuit increases out, the weight coefficient of M sub-circuit of the second cathode signal output end connection and institute
It is arranged symmetrically for stating the weight coefficient of M sub-circuit of the first cathode signal output end connection；
An output end of each signal read circuit is joined together to form the output of first anode signal in N column signal reading circuit
End, another output are joined together to form second plate signal output end, and the signal read circuit is for being isolated transmission
To the direct current signal of its input terminal, filter out from its input terminal input AC signal, and by it includes two sub-circuits
The AC signal filtered out is weighted, the weight coefficient root of N number of sub-circuit of the first anode signal output end connection
It is sequentially increased or is sequentially reduced according to the sequence that the column serial number of the N column signal reading circuit increases, read according to the N column signal
The sequence that the column serial number of circuit increases, the weight coefficient of N number of sub-circuit of the second plate signal output end connection and described
The weight coefficient of N number of sub-circuit of first anode signal output end connection is arranged symmetrically；
Each row connects end altogether connects one to one with an isolation resistance, each column connects end altogether with one described in
Signal resistance is taken to connect one to one；In the case where the reverse bias voltage applied to the SiPM array is positive voltage, with
The other end of the isolation resistance of the row connects end altogether connection is joined together to form common cathode, and the reverse bias voltage passes through institute
State common cathode application, connect with the column connects end altogether described in take the other end of signal resistance to be grounded；To the SiPM array
In the case that the reverse bias voltage of application is negative voltage, the other end for the isolation resistance connecting with the row connects end altogether is grounded,
The other end for taking signal resistance connecting with the column connects end altogether is joined together to form common-anode, and the reverse bias voltage is logical
The common-anode is crossed to apply.
2. detector signal reading circuit as described in claim 1, which is characterized in that two strips of the signal read circuit
The input terminal of circuit links together, and connects between the input terminal of the signal read circuit and the input terminal of the sub-circuit
There is capacitance, is provided with weighting resistor between the input terminal and output end of every sub-circuit of the signal read circuit；
The weighting resistor resistance value of M sub-circuit of the first cathode signal output end connection, reads electricity according to the M row signal
The sequence that the row serial number on road increases is sequentially increased or is sequentially reduced；Increase according to the row serial number of the M row signal read circuit
Sequentially, the weighting resistor resistance value and first cathode signal of M sub-circuit of the second cathode signal output end connection are defeated
The weighting resistor resistance value of M sub-circuit of outlet connection is arranged symmetrically；
The weighting resistor resistance value of N number of sub-circuit of the first anode signal output end connection, reads electricity according to the N column signal
The sequence that the column serial number on road increases is sequentially increased or is sequentially reduced；Increase according to the column serial number of the N column signal reading circuit
Sequentially, the weighting resistor resistance value of N number of sub-circuit of the second plate signal output end connection and the first anode signal are defeated
The weighting resistor resistance value of N number of sub-circuit of outlet connection is arranged symmetrically.
3. detector signal reading circuit as claimed in claim 2, which is characterized in that the first cathode signal output end connects
The inverse of the weighting resistor resistance value of the M sub-circuit connect, the sequence according to the row serial number increase of the M row signal read circuit are in
Arithmetic progression；
The inverse of the weighting resistor resistance value of N number of sub-circuit of the first anode signal output end connection, according to the N column signal
The sequence that the column serial number of reading circuit increases is in arithmetic progression.
4. detector signal reading circuit as described in claim 1, which is characterized in that two strips of the signal read circuit
The input terminal of circuit is connected together as the input terminal of the signal read circuit, every strip electricity of the signal read circuit
Weighted capacitance is provided between the input terminal and output end on road；
The weighted capacitance value of M sub-circuit of the first cathode signal output end connection, according to the M row signal read circuit
Row serial number increase sequence be sequentially increased or be sequentially reduced, according to the M row signal read circuit row serial number increase it is suitable
Sequence, the weighted capacitance value of M sub-circuit of the second cathode signal output end connection and the first cathode signal output end
The weighted capacitance value of M sub-circuit of connection is arranged symmetrically；
The weighted capacitance value of N number of sub-circuit of the first anode signal output end connection, according to the N column signal reading circuit
Column serial number increase sequence be sequentially increased or be sequentially reduced, according to the column serial number of institute N column signal reading circuit increase sequence,
The weighted capacitance value of N number of sub-circuit of second plate signal output end connection, and with the first anode signal output end
The weighted capacitance value of N number of sub-circuit of connection is arranged symmetrically.
5. detector signal reading circuit as claimed in claim 4, which is characterized in that the first cathode signal output end connects
The weighted capacitance value of the M sub-circuit connect is in wait differences according to the sequence that the row serial number of the M row signal read circuit increases
Column；
The weighted capacitance value of N number of sub-circuit of the first anode signal output end connection, according to the N column signal reading circuit
Column serial number increase sequence be in arithmetic progression.
6. detector signal reading circuit as described in any one in claim 1-5, which is characterized in that in the common cathode and often
The filter capacitor of a ground connection is connected between the isolation resistance of a line.
7. a kind of pet detector, which is characterized in that read electricity including detector signal as claimed in any one of claims 1 to 6
Road.
8. a kind of signal processing method, which is characterized in that be applied to detector signal as claimed in any one of claims 1 to 6 and read
Circuit or pet detector as claimed in claim 7, the signal processing method include: out
It is every in the SiPM array when the SiPM array of the detector signal reading circuit works under Geiger mode angular position digitizer
The SiPM pixel of a line exports the cathode signal of itself to the row connects end altogether of the row, while the SiPM pixel of each column will
The anode signal of itself is exported to the column connects end altogether of the column；
The signal read circuit of every row filters out the cathode signal of exchange, the letter of each column from the cathode signal that row connects end altogether exports
Number reading circuit filters out the anode signal of exchange from the anode signal that column connects end altogether exports；
The signal read circuit of M row is weighted summation process to the cathode signal filtered out, obtains believing from first cathode
First cathode signal X1 of number output end output and the second the cathode signal X2, N exported from the second cathode signal output end
The signal read circuit of column is weighted summation process to the anode signal filtered out, obtains exporting from the first anode signal
The second plate signal Y2 for holding the first anode signal Y1 of output and being exported from the second plate signal output end.
9. signal processing method as claimed in claim 8, which is characterized in that if the first cathode signal output end connection
The weight coefficient of sub-circuit is sequentially increased according to the sequence that the row serial number of the M row signal read circuit increases, and described
The weight coefficient of the sub-circuit of one anode signal output end connection increases suitable according to the column serial number of the N column signal reading circuit
Sequence and be sequentially increased, then according to formula below calculate generation event scintillation crystal in the position of the SiPM array, wherein
One ray and scintillation crystal occur interaction and are referred to as an event；
Wherein, the origin of coordinate system is the SiPM pixel of the first row first row in the SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, the x is the scintillation crystal of generation event in the seat
The coordinate in the x-axis of system is marked, the y is coordinate of the scintillation crystal of generation event in the y-axis of the coordinate system；
If the weight coefficient of the sub-circuit of the first cathode signal output end connection is according to the row of the M row signal read circuit
Sequence that serial number increases and be sequentially reduced, the weight coefficient of the sub-circuit of first anode signal output end connection is according to
Sequence that the column serial number of N column signal reading circuit increases and be sequentially increased, then the sudden strain of a muscle of generation event is calculated according to formula below
Crystal is sparkled in the position of the SiPM array, wherein a ray and scintillation crystal occur interaction and be referred to as an event；
Wherein, the origin of coordinate system is the SiPM pixel of M row first row in the SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, the x is the scintillation crystal of generation event in the seat
The coordinate in the x-axis of system is marked, the y is coordinate of the scintillation crystal of generation event in the y-axis of the coordinate system；
If the weight coefficient of the sub-circuit of the first cathode signal output end connection is according to the row of the M row signal read circuit
Sequence that serial number increases and be sequentially increased, the weight coefficient of the sub-circuit of first anode signal output end connection is according to
Sequence that the column serial number of N column signal reading circuit increases and be sequentially reduced, then the sudden strain of a muscle of generation event is calculated according to formula below
Crystal is sparkled in the position of the SiPM array, wherein a ray and scintillation crystal occur interaction and be referred to as an event；
Wherein, the origin of coordinate system is the SiPM pixel of the first row Nth column in the SiPM array；The direction of x-axis is described the
The direction that the weight coefficient of M sub-circuit of one cathode signal output end connection increases, the direction of y-axis are first anode letter
The direction that the weight coefficient of N number of sub-circuit of number output end connection increases, the x is the scintillation crystal of generation event in the seat
The coordinate in the x-axis of system is marked, the y is coordinate of the scintillation crystal of generation event in the y-axis of the coordinate system；
If the weight coefficient of the sub-circuit of the first cathode signal output end connection is according to the row of the M row signal read circuit
Sequence that serial number increases and be sequentially reduced, the weight coefficient of the sub-circuit of first anode signal output end connection is according to
Sequence that the column serial number of N column signal reading circuit increases and be sequentially reduced, then the sudden strain of a muscle of generation event is calculated according to formula below
Crystal is sparkled in the position of the SiPM array, wherein a ray and scintillation crystal occur interaction and be referred to as an event；
Wherein, the origin of coordinate system is the SiPM pixel of M row Nth column in the SiPM array；The direction of x-axis is described first
The direction that the weight coefficient of M sub-circuit of cathode signal output end connection increases, the direction of y-axis are the first anode signal
The direction that the weight coefficient of N number of sub-circuit of output end connection increases, the x is the scintillation crystal of generation event in the coordinate
Coordinate in the x-axis of system, the y are coordinate of the scintillation crystal of generation event in the y-axis of the coordinate system.
10. signal processing method as claimed in claim 8 or 9, which is characterized in that on the detector signal reading circuit because
The ENERGY E generated for ray and scintillation crystal interaction indicates are as follows: E=EX1+EX2+EY1+EY2, wherein EX1 is signal X1
Energy, EX2 be signal X2 energy, EY1 be signal Y1 energy, EY2 be signal Y2 energy.
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