CN109998582A - Coincidence judging and selecting method, device, equipment and medium - Google Patents
Coincidence judging and selecting method, device, equipment and medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a coincidence judging and selecting method, device, equipment and medium, and relates to the technical field of medical images. The method comprises the following steps: determining the period difference between the period of the first event and the period of the second event according to the event occurrence period of the photon received by the detector; determining the occurrence time difference of the first event and the second event according to the period difference, the TDC value of the first event and the TDC value of the second event; and if the time difference is smaller than a set time threshold, determining that the first event and the second event have a coincidence relation. The coincidence judgment method, the coincidence judgment device, the coincidence judgment equipment and the coincidence judgment medium provided by the embodiment of the invention realize coincidence judgment of any two detectors in different detector units or in the same detector unit.
Description
Technical field
The present embodiments relate to medical image technical field more particularly to one kind meet sentence choosing method, device, equipment and
Medium.
Background technique
Positron emission tomography (Positron Emission Tomography, below abbreviation PET) is a kind of
The angiographic method of non-intrusion type.The basic principle that it is imaged is that positron-emitting radionuclides are marked on molecular probe, when putting
After positive electron and the intracorporal negative electron collision of biology that the decay of penetrating property nucleic generates, issuing a pair of of energy is 511KeV, fortune
The approximately opposed γ photon in dynamic direction.PET uses the detector rings around organism that incident γ photon is converted to electric signal,
To obtain its energy, position and temporal information.By burying in oblivion the technology of meeting, the position of line of response where obtaining annihilation event,
And distribution of the positron radionuclide in organism is obtained by two dimension or three-dimension disclocation algorithm for reconstructing, thus observation biology in vitro
Intracorporal physiology and biochemical process.As shown in Figure 1, generating two gammaphotons of 180 degree each other, quilt after a positron annihilation
Detector receives M0 and M10, and the straight line of this photon flight is called line of response, photon reaching time-difference between M0 and M10
It is exactly the path length difference of two photon flights.
Traditional PET device is there is usually one pet detector unit, by 20 or more detectors inside the unit
Form detector rings.Therefore, traditional equality circuit can only handle the small window width symbol inside a unit between each detector data
Choosing is sentenced in conjunction.
However, the geometrical solid angle coating ratio of the PET device of only one traditional pet detector unit is smaller, have big
It measures γ photon to escape from annular detector both ends gap, be not collected by detector, to meet the detection efficient of event very
It is low.In order to improve detection sensitivity, multiple pet detector units are symmetrically added at annular detector both ends.
For the detector device being made of multiple pet detector units, different spies can be completed by needing to meet processing unit
Any two detector surveyed between device unit meets processing.Since the line of response of the detector composition on two units is more same
Line of response is longer between two detectors inside unit, so traditional small window width meets and sentences screening device and can not achieve to difference
Any two detector between detector cells meets processing.
Summary of the invention
The embodiment of the present invention, which provides one kind and meets, sentences choosing method, device, equipment and medium, to realize to different detector lists
Any two detector between member or in same probe unit meets judgement.
Choosing method is sentenced in a first aspect, meeting the embodiment of the invention provides one kind, this method comprises:
The event generating period that photon is received according to detector determines that place period at moment and the second thing occur for first event
The periodic inequality in period where moment occurs for part；
TDC (time-to-digital converter, time-to-digital converter) according to the periodic inequality, first event
The TDC value of value and second event, determines that first event and second event time of origin are poor；
If the time difference is less than setting time threshold value, it is determined that first event and second event, which have, meets relationship.
Second aspect meets the embodiment of the invention also provides one kind and sentences screening device, which includes:
Periodic inequality determining module determines first event for receiving the event generating period of photon according to detector
The periodic inequality in period where moment occurs for period where the moment and second event；
Time difference determining module, for the TDC time-to-digital converter value and the second thing according to the periodic inequality, first event
The TDC value of part determines that first event and second event time of origin are poor；
Meet determining module, if being less than setting time threshold value for the time difference, it is determined that first event and the second thing
Part, which has, meets relationship.
The third aspect, the embodiment of the invention also provides a kind of equipment, the equipment includes:
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processing
Device realizes that one kind as described in any in the embodiment of the present invention meets and sentences choosing method.
Fourth aspect, the embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer
Program realizes that one kind as described in any in the embodiment of the present invention meets and sentences choosing method when the program is executed by processor.
The embodiment of the present invention passed through according to week where period where the first event generation moment and second event generation moment
The TDC value of the periodic inequality of phase, the TDC value of first event and second event determines that first event and second event time of origin are poor；
Determine that whether having for two events meets relationship according to time of origin difference.To not only may be implemented in same probe unit
Any two detector meet judgement, can also realize meeting between any two detector different detector cells
Judgement.
Detailed description of the invention
Fig. 1 is single detector unit internal response line schematic diagram in PET device；
Fig. 2 is two detector cells span unit line of response schematic diagrames in PET device；
Fig. 3 is to meet event to appear in the same clock cycle and the first occurred schematic diagram of A event；
Fig. 4 is to meet event to appear in the same clock cycle and the first occurred schematic diagram of B event；
Fig. 5 is to meet the signal that event appears in the different clocks period and a clock cycle occurs for B event elder generation A event
Figure；
Fig. 6 is to meet the signal that event appears in the different clocks period and a clock cycle occurs for A event elder generation B event
Figure；
Fig. 7 is to meet the signal that event appears in the different clocks period and two clock cycle occur for B event elder generation A event
Figure；
Fig. 8 is to meet the signal that event appears in the different clocks period and two clock cycle occur for A event elder generation B event
Figure；
Fig. 9 is that a kind of of the offer of the embodiment of the present invention one meets the flow chart for sentencing choosing method；
Figure 10 is provided by Embodiment 2 of the present invention a kind of to meet the flow chart for sentencing choosing method；
Figure 11 is that a kind of of the offer of the embodiment of the present invention three meets the flow chart for sentencing choosing method；
Figure 12 is that a kind of of the offer of the embodiment of the present invention three meets the structural schematic diagram for sentencing screening device；
Figure 13 is that a kind of of the offer of the embodiment of the present invention four meets the structural schematic diagram for sentencing screening device；
Figure 14 is a kind of structural schematic diagram for equipment that the embodiment of the present invention five provides.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Referring to fig. 2, inventor has found in the implementation of the present invention, when PET device is there are when multiple detector cells,
In the presence of the line of response between two detectors across detector cells, i.e. detector M0 and detector cells U3 in detector cells U0
Line of response between middle detector M10.Since the line of response is compared to the response between two detectors in same detector cells
Line can be longer, so the differential time of flight that two photons are likely to occur can be bigger.It screens out to meet event as handle,
It needs to meet processing unit and has the ability for meeting judgement for handling big window width.
Inventor traverses all the case where being likely to occur thus, for each case analysis obtain TDC_A, TDC_B and
Relationship between Twindow is as follows.Wherein TDC_A is when detector A event (hereinafter referred to as A event) occurs apart from next clock
The TDC quantized value of the time of period rising edge namely the TDC value of A event.TDC_B is detector B event (hereinafter referred to as B thing
Part) the TDC quantized value of time apart from next clock cycle rising edge namely the TDC value of B event when occurring.Twindow is
Meet the size namely setting time threshold value of window width, this was sentenced for more than one clock cycle.
Fig. 3, which is shown, to be met event and appears in the same clock cycle, and A event elder generation B event occurs, the generation of two events
Time and TDC value.If A event and B event are to meet event as can be seen from Figure 3, need to meet Tab=TDC_A-TDC_B <
Twindow.Wherein Tab is the differential time of flight for two events that detector A and detector B are received.
Fig. 4, which is shown, to be met event and appears in the same clock cycle, and B event elder generation A event occurs, the generation of two events
Time and TDC value.If A event and B event are to meet event as can be seen from Figure 4, need to meet Tab=TDC_B-TDC_A <
Twindow。
Complex chart 3 and Fig. 4 need to meet if two meet event and appear in the same clock cycle | TDC_A-TDC_
B | < Twindow, the formula also deform are as follows:-Twindow < TDC_A-TDC_B < Twindow.
Fig. 5, which is shown, to be met event and appears in the different clocks period, and a clock cycle occurs for B event elder generation A event, and two
The time of origin and TDC value of event.If two events are to meet event, need to meet Tab=TDC_B+T-TDC_A <
Twindow, formula deform to obtain TDC_A-TDC_B >-Twindow+T.Wherein T is the system synchronised clock period, by taking 10ns as an example.
Fig. 6, which is shown, to be met event and appears in the different clocks period, and a clock cycle occurs for A event elder generation B event, and two
The time of origin and TDC value of event.If two events are to meet event, need to meet Tab=TDC_A+T-TDC_B <
Twindow, formula are deformed into TDC_A-TDC_B <-T+Twindow.
Fig. 7, which is shown, to be met event and appears in the different clocks period, and two clock cycle occur for B event elder generation A event, and two
The time of origin and TDC value of event.If two events are to meet event, need to meet Tab=TDC_B+2T-TDC_A <
Twindow, formula deform to obtain TDC_A-TDC_B > 2T-Twindow.
Fig. 8, which is shown, to be met event and appears in the different clocks period, and two clock cycle occur for A event elder generation B event, and two
The time of origin and TDC value of event.If two events are to meet event, need to meet Tab=TDC_A+2T-TDC_B <
Twindow, formula are deformed into TDC_A-TDC_B < Twindow-2T.
In summary:
1. if compared to B event, it is integer that N number of clock cycle, N under, which occur, for A event, then if two events are symbol
Conjunction event then needs to meet Tab=TDC_B+N × T-TDC_A<Twindow i.e. TDC_A-TDC_B>N × T-Twindow；
2. if compared to A event, it is integer that N number of clock cycle, N under, which occur, for B event, then if two events are symbol
Conjunction event then needs to meet Tab=TDC_A+N × T-TDC_B < Twindow i.e. TDC_A-TDC_B <-N × T+Twindow；
When 3.N=0, show that A event, B event occurred within the same clock cycle.
For Twindow value there is no limit, can according to need take it is arbitrarily large.
Embodiment one
Fig. 9 is that a kind of of the offer of the embodiment of the present invention one meets the flow chart for sentencing choosing method.The present embodiment is applicable to pair
The case where meeting judgement of any two detector between different detector cells or in same probe unit.This method can be with
Met by one kind and sentence screening device to execute, which can be realized by the mode of software and/or hardware.Referring to Fig. 9, the present embodiment
Meeting for providing sentences choosing method and includes:
S110, according to detector receive photon event generating period, determine first event occur the moment where the period and
The periodic inequality in period where moment occurs for second event.
Wherein, first event and second event are that two detectors of judgement to be met receive the event of photon.And first
The affiliated detector of event and the affiliated detector of second event can be located at same detector cells, can also be located at different spies
Survey device unit.
Specifically, the event generating period that detector receives photon can pass through the clock pulses of event generation time system
The affiliated period determines.
S120, according to the periodic inequality, the TDC value of the TDC value of first event and second event, determine first event and
Two Time To Events are poor.
Specifically, if the periodic inequality is 0, illustrate that first event and second event are located at same period, then first event
It is equal to the absolute value of the TDC value of first event and the TDC value of second event with second event time of origin difference.
If the periodic inequality is non-zero, illustrate first event and second event be across periodic event, and first event prior to
Second event occurs, then first event and second event time of origin difference be equal to the TDC value of first event+described periodic inequality × when
Clock period-second event TDC value.
If S130, the time difference are less than setting time threshold value, it is determined that first event and second event, which have, meets pass
System.
Wherein, setting time threshold value refers to the maximum value of the time of origin difference for the event that two have the relationship that meets.If will
Setting time threshold value regards time window as, then the present embodiment is suitable for meeting for arbitrarily large window width sentencing choosing, specifically can basis
Actual needs setting.
The technical solution of the embodiment of the present invention is occurred by period where the moment occurs according to first event and second event
Periodic inequality, the TDC value of the TDC value of first event and second event in period, determine first event and second event where moment
Time of origin is poor；Determine that whether having for two events meets relationship according to time of origin difference.To not only may be implemented to identical
Any two detector in detector cells meets judgement, can also realize between any two different detector cells
Detector meets judgement.For following PET device, no matter detector cells number how many, the number between any two unit
According to judgement is met, it is applicable in.
To realize to the subsequent processing for meeting event, if the time difference is less than setting time threshold value, it is determined that the
One event and second event have after the relationship that meets, further includes:
First event and second event respective time, energy and location information are merged into one and meet data and defeated
Out.
It is emphasized that the present embodiment is applicable to back-end processing, it connect with detector, is realized by hardware circuit, electricity
Road is printed on coincident circuit plate.It carries out meeting judgement using sliding window compared to exporting first event and second event to front end,
The present embodiment saves the output of first event and second event, to improve the real-time for meeting event judgement and processing speed
Degree.
Embodiment two
Figure 10 is provided by Embodiment 2 of the present invention a kind of to meet the flow chart for sentencing choosing method.The present embodiment is in above-mentioned reality
On the basis of applying example, a kind of optinal plan of proposition.Referring to Figure 10, it is provided in this embodiment meet sentence choosing method and include:
S210, according to detector receive photon event generating period, determine first event occur the moment where the period and
The periodic inequality in period where moment occurs for second event.
S220, the event generating period that photon is received according to the periodic inequality or detector, determine first event and second
The sequencing of Time To Event.
Specifically, the sequencing of first event and second event time of origin can be according to the positive and negative true of the periodic inequality
It is fixed, it can also be determined according to the generating period of first event and second event.
For example, first event occurred in the first clock cycle, second event occurred in the second clock period, then
Determine that first event occurs prior to second event.
S230, object time difference formula is determined according to the sequencing determined.
It is specifically, described to determine object time difference formula according to the sequencing determined, comprising:
If first event occurs prior to second event, it is determined that targeted time period difference formula are as follows: the TDC value of first event
+ period absolute value of the difference × system synchronised clock period-second event TDC value；
If second event occurs prior to first event, it is determined that targeted time period difference formula are as follows: the TDC value of second event
+ period absolute value of the difference × system synchronised clock period-first event TDC value.
S240, to bring the TDC value of the periodic inequality, the TDC value of first event and second event into the object time poor
Formula show that first event and second event time of origin are poor.
If S250, the time difference are less than setting time threshold value, it is determined that first event and second event, which have, meets pass
System.
The technical solution of the embodiment of the present invention, it is true by the sequencing according to first event and second event time of origin
Set the goal time difference formula, when bringing the TDC value of the periodic inequality, the TDC value of first event and second event into the target
Between poor formula, show that first event and second event time of origin are poor.If the time difference is less than setting time threshold value, it is determined that
First event and second event, which have, meets relationship.Judgement is met to two events to realize.
Embodiment three
Figure 11 is that a kind of of the offer of the embodiment of the present invention three meets the flow chart for sentencing choosing method.The present embodiment is in above-mentioned reality
On the basis of applying example, two events with judgement to be met are respectively that the A event of detector A and detector B acquisition is with B event
Example, a clock optinal plan of proposition.Referring to Figure 11, it is provided in this embodiment meet sentence choosing method and include:
S310, the periodic inequality for determining A event Yu B event generation time.
S320, the sequencing that A event and B event occur is determined.
Difference between S330, the TDC value for calculating A event and the TDC value of B event, and be assigned to one and have symbol deposit
Device.
If S340, A event occur prior to B event, inequality TDC_A-TDC_B <-N × T+Twindow is selected, if B event
Occur prior to A event, selects inequality TDC_A-TDC_B > N × T-Twindow, carry out meeting judgement, wherein TDC_A is A thing
The TDC value of part, TDC_B are the TDC values of B event, and N is the periodic inequality of A event Yu B event generation time, and T is system clock week
Phase, Twindow are setting time threshold values.
S350, from have sign register obtain A event TDC value and B event TDC value between difference, according to A event
TDC value and B event TDC value between difference and determination inequality, determine that A event meets with whether B event has
Relationship；Two there is the single event for the relationship that meets to be merged into a data, exports two events with the relationship that meets respectively
Time, energy, location information.
The embodiment of the present invention to the execution of each step sequence without limitation.Optionally, S340 can be executed prior to S330.
Referring to Figure 12, choosing method is sentenced based on meeting for the present embodiment description, equality circuit may include that sequence determines mould
Block makees difference module, meets inequality determining module and meet to sentence and select and meet output module.
Wherein, sequent modular is used to determine the sequencing that A event and B event occur；Make difference module for calculating A event
TDC value and B event TDC value between difference, and be assigned to one and have sign register；Meet inequality determining module use
If occurring in A event prior to B event, inequality TDC_A-TDC_B <-N × T+Twindow is selected, if B event is sent out prior to A event
It is raw, inequality TDC_A-TDC_B > N × T-Twindow is selected, carries out meeting judgement；Meet to sentence choosing and meet output module and be used for
From there is sign register to obtain the difference between the TDC value of A event and the TDC value of B event, according to the TDC value of A event and B thing
The inequality of difference and determination between the TDC value of part, determines whether A event and B event have the relationship of meeting；Two are had
There is the single event for the relationship of meeting to be merged into a data, exports two events respective time, the energy, position with the relationship that meets
Confidence breath.
Following effect may be implemented in the technical solution of the present embodiment, and the present embodiment adapts to sentence meeting for arbitrarily large window width
Choosing, covers all window width situations, the difference of window width value is exactly a change case.
In addition, the present embodiment, which is capable of handling meeting across any unit number, sentences choosing, for following PET device, no matter visit
Survey device unit number how many, the judgement of data fit between any two unit is applicable in.
It should be noted that technical teaching based on the above embodiment, those skilled in the art have motivation by above-mentioned implementation
Mode is combined, to realize meeting between any two detector different detector cells or in same probe unit
Judgement.
Example IV
Figure 13 is that a kind of of the offer of the embodiment of the present invention four meets the structural schematic diagram for sentencing screening device.Referring to Figure 13, this reality
Meeting for example offer is applied to sentence screening device and include: periodic inequality determining module 10, time difference determining module 20, meet determining module 30.
Wherein, periodic inequality determining module 10 determines the first thing for receiving the event generating period of photon according to detector
The periodic inequality in period where moment occurs for period where the moment occurs for part and second event；
Time difference determining module 20, for the TDC time-to-digital converter value and second according to the periodic inequality, first event
The TDC value of event determines that first event and second event time of origin are poor；
Meet determining module 30, if being less than setting time threshold value for the time difference, it is determined that first event and second
Event, which has, meets relationship.
The embodiment of the present invention passed through according to week where period where the first event generation moment and second event generation moment
The TDC value of the periodic inequality of phase, the TDC value of first event and second event determines that first event and second event time of origin are poor；
Determine that whether having for two events meets relationship according to time of origin difference.To not only may be implemented in same probe unit
Any two detector meet judgement, can also realize meeting between any two detector different detector cells
Judgement.
Further, the time difference determining module, comprising: order of occurrence determination unit, target formula determination unit and
Time difference determination unit.
Wherein, week occurs for order of occurrence determination unit, the event for receiving photon according to the periodic inequality or detector
Phase determines the sequencing of first event and second event time of origin；
Target formula determination unit, for determining object time difference formula according to the sequencing determined；
Time difference determination unit, for bringing the TDC value of the TDC value of the periodic inequality, first event and second event into
The object time difference formula show that first event and second event time of origin are poor.
Further, the target formula determination unit is specifically used for:
If first event occurs prior to second event, it is determined that targeted time period difference formula are as follows: the TDC value of first event
+ period absolute value of the difference × system synchronised clock period-second event TDC value；
If second event occurs prior to first event, it is determined that targeted time period difference formula are as follows: the TDC value of second event
+ period absolute value of the difference × system synchronised clock period-first event TDC value.
Further, the device, further includes: data combiners block and meet data outputting module.
Data combiners block, if for the time difference less than setting time threshold value, it is determined that first event and the
First event and second event respective time, energy and location information are merged into one with after meeting relationship by two events
It is a to meet data；
Meet data outputting module, for data output will to be met.
Meet provided by the embodiment of the present invention sentence screening device can be performed it is provided by any embodiment of the invention meet sentence
Choosing method has the corresponding functional module of execution method and beneficial effect.
Embodiment five
Figure 14 is a kind of structural schematic diagram for equipment that the embodiment of the present invention five provides.As shown in figure 14, which includes
Processor 70, memory 71, input unit 72 and output device 73；The quantity of processor 70 can be one or more in equipment
It is a, in Figure 14 by taking a processor 70 as an example；Processor 70, memory 71, input unit 72 and output device 73 in equipment
It can be connected by bus or other modes, in Figure 14 for being connected by bus.
Memory 71 is used as a kind of computer readable storage medium, can be used for storing software program, journey can be performed in computer
Sequence and module (choose to install as sentenced the corresponding program instruction/module of choosing method meeting in the embodiment of the present invention for example, meeting and sentencing
Periodic inequality determining module 10 in setting, meets determining module 30 at time difference determining module 20).Processor 70 passes through operation storage
Software program, instruction and module in memory 71, thereby executing the various function application and data processing of equipment, i.e.,
Realize that choosing method is sentenced in above-mentioned meeting.
Memory 71 can mainly include storing program area and storage data area, wherein storing program area can store operation system
Application program needed for system, at least one function；Storage data area, which can be stored, uses created data etc. according to terminal.This
Outside, memory 71 may include high-speed random access memory, can also include nonvolatile memory, for example, at least a magnetic
Disk storage device, flush memory device or other non-volatile solid state memory parts.In some instances, memory 71 can be further
Including the memory remotely located relative to processor 70, these remote memories can pass through network connection to equipment.It is above-mentioned
The example of network includes but is not limited to internet, intranet, local area network, mobile radio communication and combinations thereof.
Input unit 72 can be used for receiving the number or character information of input, and generate with the user setting of equipment and
The related key signals input of function control.Output device 73 may include that display screen etc. shows equipment.
Embodiment six
The embodiment of the present invention six also provides a kind of storage medium comprising computer executable instructions, and the computer can be held
Row instruction, which is used to execute one kind when being executed by computer processor to meet, sentences choosing method, this method comprises:
The event generating period that photon is received according to detector determines that place period at moment and the second thing occur for first event
The periodic inequality in period where moment occurs for part；
According to the periodic inequality, the TDC value of the TDC time-to-digital converter value of first event and second event, first is determined
Event and second event time of origin are poor；
If the time difference is less than setting time threshold value, it is determined that first event and second event, which have, meets relationship
Certainly, a kind of storage medium comprising computer executable instructions, computer provided by the embodiment of the present invention
The operation of method that executable instruction is not limited to the described above, can also be performed it is provided by any embodiment of the invention meet sentence choosing
Relevant operation in method
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
It can be realized by software and required common hardware, naturally it is also possible to which by hardware realization, but in many cases, the former is more
Good embodiment.Based on this understanding, technical solution of the present invention substantially in other words contributes to the prior art
Part can be embodied in the form of software products, which can store in computer readable storage medium
In, floppy disk, read-only memory (Read-Only Memory, ROM), random access memory (Random such as computer
Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
It is worth noting that, above-mentioned meet in the embodiment for sentencing screening device, included each unit and module are only pressed
It is divided, but is not limited to the above division according to function logic, as long as corresponding functions can be realized；In addition,
The specific name of each functional unit is also only for convenience of distinguishing each other, the protection scope being not intended to restrict the invention.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. one kind, which meets, sentences choosing method characterized by comprising
The event generating period that photon is received according to detector determines that place period at moment and second event hair occur for first event
The periodic inequality in period where the raw moment；
According to the periodic inequality, the TDC value of the TDC time-to-digital converter value of first event and second event, first event is determined
It is poor with second event time of origin；
If the time difference is less than setting time threshold value, it is determined that first event and second event, which have, meets relationship.
2. method according to claim 1, which is characterized in that described according to the periodic inequality, the TDC value of first event and
The TDC value of two events determines that first event and second event time of origin are poor, comprising:
The event generating period that photon is received according to the periodic inequality or detector, when determining that first event and second event occur
Between sequencing；
Object time difference formula is determined according to the sequencing determined；
It brings the TDC value of the periodic inequality, the TDC value of first event and second event into the object time difference formula, obtains
First event and second event time of origin are poor.
3. according to the method described in claim 2, it is characterized in that, described determine that the object time is poor according to the sequencing determined
Formula, comprising:
If first event occurs prior to second event, it is determined that targeted time period difference formula are as follows: TDC value+week of first event
Phase absolute value of the difference × system synchronised clock period-second event TDC value；
If second event occurs prior to first event, it is determined that targeted time period difference formula are as follows: TDC value+week of second event
Phase absolute value of the difference × system synchronised clock period-first event TDC value.
4. method according to claim 1 to 3, which is characterized in that if the time difference is less than setting time
Threshold value, it is determined that first event and second event have after the relationship that meets, further includes:
First event and second event respective time, energy and location information are merged into one to meet data and export.
5. one kind, which meets, sentences screening device characterized by comprising
Periodic inequality determining module determines that the moment occurs for first event for receiving the event generating period of photon according to detector
The periodic inequality in period where moment occurs for place period and second event；
Time difference determining module, for the TDC time-to-digital converter value and second event according to the periodic inequality, first event
TDC value determines that first event and second event time of origin are poor；
Meet determining module, if being less than setting time threshold value for the time difference, it is determined that first event and second event tool
There is the relationship of meeting.
6. device according to claim 5, which is characterized in that the time difference determining module, comprising:
Order of occurrence determination unit determines for receiving the event generating period of photon according to the periodic inequality or detector
The sequencing of one event and second event time of origin；
Target formula determination unit, for determining object time difference formula according to the sequencing determined；
Time difference determination unit, it is described for bringing the TDC value of the TDC value of the periodic inequality, first event and second event into
Object time difference formula show that first event and second event time of origin are poor.
7. device according to claim 6, which is characterized in that the target formula determination unit is specifically used for:
If first event occurs prior to second event, it is determined that targeted time period difference formula are as follows: TDC value+week of first event
Phase absolute value of the difference × system synchronised clock period-second event TDC value；
If second event occurs prior to first event, it is determined that targeted time period difference formula are as follows: TDC value+week of second event
Phase absolute value of the difference × system synchronised clock period-first event TDC value.
8. according to the device any in claim 5-7, which is characterized in that further include:
Data combiners block, if being less than setting time threshold value for the time difference, it is determined that first event and the second thing
First event and second event respective time, energy and location information are merged into a symbol with after meeting relationship by part
Close data；
Meet data outputting module, for data output will to be met.
9. a kind of equipment, which is characterized in that the equipment includes:
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processors are real
Now one kind as described in any in claim 1-4, which meets, sentences choosing method.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
It realizes that one kind as described in any in claim 1-4 meets when execution and sentences choosing method.
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| CN201910299086.5A CN109998582B (en) | 2019-04-15 | 2019-04-15 | Coincidence judging and selecting method, device, equipment and medium |
| EP20791156.1A EP3937785A4 (en) | 2019-04-15 | 2020-04-15 | Systems and methods for determining true coincidence events |
| PCT/CN2020/084861 WO2020211764A1 (en) | 2019-04-15 | 2020-04-15 | Systems and methods for determining true coincidence events |
| US17/450,837 US20220031272A1 (en) | 2019-04-15 | 2021-10-14 | Systems and methods for determining true coincidence events |
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