CN108008438A - The measuring device and method of a kind of ray energy - Google Patents
The measuring device and method of a kind of ray energy Download PDFInfo
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- CN108008438A CN108008438A CN201610933323.5A CN201610933323A CN108008438A CN 108008438 A CN108008438 A CN 108008438A CN 201610933323 A CN201610933323 A CN 201610933323A CN 108008438 A CN108008438 A CN 108008438A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000013078 crystal Substances 0.000 claims abstract description 35
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- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000012636 positron electron tomography Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
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- 230000005251 gamma ray Effects 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005622 photoelectricity Effects 0.000 description 3
- 229910052765 Lutetium Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
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- 229910052738 indium Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000012879 PET imaging Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ORCSMBGZHYTXOV-UHFFFAOYSA-N bismuth;germanium;dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Ge].[Ge].[Ge].[Bi].[Bi].[Bi].[Bi] ORCSMBGZHYTXOV-UHFFFAOYSA-N 0.000 description 1
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000003750 conditioning effect Effects 0.000 description 1
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- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- ADOANNTYRWJJIS-UHFFFAOYSA-N lutetium silicic acid Chemical compound [Lu].[Si](O)(O)(O)O ADOANNTYRWJJIS-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052727 yttrium Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/202—Measuring radiation intensity with scintillation detectors the detector being a crystal
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Abstract
The invention discloses the measuring device and method of a kind of ray energy, which includes：Sequentially connected scintillation crystal, photoelectric converter, preamplifier, N nthdifferentials device, comparator and Thin interbed device；Scintillation crystal, every ray for that will receive are converted into passage of scintillation light respectively；Photoelectric converter, for the passage of scintillation light to be converted into electric signal；Preamplifier, for amplifying the electric signal；N nthdifferential devices, for carrying out n times differential process to amplified electric signal；Comparator, for compared with comparator threshold, the electric signal after differential process to be exported at least one pulse signal according to comparative result；Thin interbed device, for identifying going out current moment for first pulse signal, and to the number of cut-off time statistics pulse signal since this goes out current moment, the energy of ray is determined according to the pulse number counted.The present invention can reduce the measurement cost of ray energy and improve the accuracy of measurement result.
Description
Technical field
The present invention relates to the measuring device and method in nuclear detection technology field, more particularly to a kind of ray energy.
Background technology
Positron e mission computed tomography (Positron Emission Computed Tomography, referred to as
PET) detection system in equipment is usually made of scintillation crystal, photoelectric converter and rear end reading circuit.Scintillation crystal will
After the ray received is converted into passage of scintillation light, passage of scintillation light is imported into corresponding photoelectric converter, then obtain by rear end reading circuit
Take ray relevant information.
After injecting scintillation crystal 101 photoelectric effect occurs for PET detection system composition schematic diagrams shown in Figure 1, ray
Passage of scintillation light is produced, passage of scintillation light enters photoelectric converter 102 and causes the avalanche breakdown of diode to produce electric signal, preamplifier
After 103 pairs of electric signals are amplified, the presentation time that crosses for determining signal using comparator 104 carves, and makes the identification of time calibrating circuit 105 the
At the time of spending the presentation time for one to carve, and be demarcated as first photon arrival photoelectric converter 102, and enable from this moment
The signal that amount Acquisition Circuit 106 exports preamplifier 103 carries out discretization collection, is believed using the series of discrete collected
The energy of number definite initial ray.
But on above-mentioned prior art, independent collecting energy and temporal information, it is necessary to by preamplifier 103
The signal of output, which is divided into two, to be handled, this to add fan-in on electronic circuit and the device such as is fanned out to, and extends signal chains
Road, reduces the signal-to-noise ratio in link；It is more demanding to the sample rate of energy acquisition circuit in energy acquisition path but high
The chip cost of sample rate is higher.
The content of the invention
In view of this, the main purpose of the embodiment of the present invention is the measuring device and method for providing a kind of ray energy,
The measurement cost of ray energy can be reduced and improve the accuracy of measurement result.
An embodiment of the present invention provides a kind of measuring device of ray energy, including：Sequentially connected scintillation crystal, photoelectricity
Converter, preamplifier, N nthdifferentials device, comparator and Thin interbed device, wherein, N >=1；
The scintillation crystal, every ray for that will receive are converted into passage of scintillation light respectively；
The photoelectric converter, for the passage of scintillation light to be converted into electric signal；
The preamplifier, for amplifying the electric signal；
The N nthdifferentials device, for carrying out n times differential process to amplified electric signal；
The comparator, for by the electric signal after differential process compared with comparator threshold, according to comparative result
Export at least one pulse signal；
The Thin interbed device, for identifying going out current moment for first pulse signal, and since it is described go out current moment
The number of the pulse signal is counted to cut-off time, the energy of the ray is determined according to the pulse number counted, wherein,
At the time of the cut-off time is before the end time of electric signal decay or the end time.
Optionally, the Thin interbed device includes：
Pulse is along recognition unit, and for identifying the edge signal of each pulse signal, the edge signal is the pulse
The rising edge or trailing edge of signal or one section of permanent High level or one section of lasting low level；
Time recording unit, goes out current moment for first edge signal of record；
Pulse statistic unit, for going out current moment to the cut-off time from first edge signal, starts to count institute
State the number of edge signal；
Thin interbed unit, for determining the energy of the ray according to the edge number counted.
Optionally, described device further includes：
Relationship storage, for prestoring the correspondence between ray energy and pulse number；
Then, the Thin interbed unit, specifically for being determined according to the correspondence and the edge number counted
The energy of the ray.
Optionally, the Thin interbed device is time-to-digit converter TDC or programming logic gate array FPGA.
Optionally, N=1 or N=2 or N=3.
Optionally, described device further includes：
Energy flush trimmer, for analyzing the corresponding energy size of every ray, rejects more than first threshold or is less than
The energy value of second threshold, wherein, the second threshold is less than the first threshold.
The embodiment of the present invention additionally provides a kind of measuring method of ray energy, and the method is applied to a kind of ray energy
Measuring device, described device includes：Sequentially connected scintillation crystal, photoelectric converter, preamplifier, N nthdifferentials device, ratio
Compared with device and Thin interbed device, wherein, N >=1；The described method includes：
The every ray received is converted into passage of scintillation light by the scintillation crystal respectively；
The passage of scintillation light is converted into electric signal by the photoelectric converter；
The preamplifier amplifies the electric signal；
The N nthdifferentials device carries out n times differential process to amplified electric signal；
The comparator by the electric signal after differential process compared with comparator threshold, according to comparative result export to
A few pulse signal；
The Thin interbed device identifies going out current moment for first pulse signal, and since it is described go out current moment to cut-off
Moment counts the number of the pulse signal, and the energy of the ray is determined according to the pulse number counted, wherein, described section
At the time of only the moment is before the end time of electric signal decay or the end time.
Optionally, the identification first pulse goes out current moment, and since it is described go out current moment count the pulse
The number of signal, the energy of the ray is determined according to the pulse number counted, including：
Identify the edge signal of each pulse signal, rising edge or decline of the edge signal for the pulse signal
Edge or one section of permanent High level or one section of lasting low level；
First edge signal of record goes out current moment；
Go out current moment to the cut-off time from first edge signal, start to count the number of the edge signal；
Edge number according to counting determines the energy of the ray.
Optionally, the method further includes：
Prestore the correspondence between ray energy and pulse number；
Then, the edge number that the basis counts determines that the energy of the ray includes：
The energy of the ray is determined according to the correspondence and the edge number counted.
Optionally, the Thin interbed device is time-to-digit converter TDC or programming logic gate array FPGA.
Optionally, N=1 or N=2 or N=3.
Optionally, the method further includes：
The corresponding energy size of every ray is analyzed, rejecting is more than first threshold or the energy less than second threshold
Value, wherein, the second threshold is less than the first threshold.
The measuring device and method of ray energy provided in an embodiment of the present invention, using N nthdifferential devices to preamplifier
The electric signal of output carries out the differential process of n times, can be rendered obvious by the fluctuating information of preamplifier output electric signal, then leads to
Cross comparator and these fluctuating information are converted into multiple pulse signals, this pulse signal can be easier by Thin interbed device
Recognize, and based on the incidence relation between pulse number and ray energy, Thin interbed device can be by counting pulse
Count to determine the energy size of ray.As it can be seen that the present embodiment uses a link path, signal link improves chain without branch
Signal-to-noise ratio in road and simplify circuit；In addition, determining ray energy by counting pulse number, pulse information is more prone to
It is identified, the requirement of high sampling rate when carrying out discrete acquisitions to energy information in the prior art is avoided, so as to save energy
Measure the input cost of Acquisition Circuit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is PET detection systems composition schematic diagram in the prior art of the invention；
Fig. 2 is the composition schematic diagram of the measuring device of ray energy provided in an embodiment of the present invention；
Fig. 3 is differential circuit schematic diagram provided in an embodiment of the present invention；
Fig. 4 exports one of schematic diagram for energy information provided in an embodiment of the present invention；
Fig. 5 is that energy information provided in an embodiment of the present invention exports the two of schematic diagram；
Fig. 6 is pulse train schematic diagram provided in an embodiment of the present invention；
Fig. 7 is the flow diagram of the measuring method of ray energy provided in an embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without making creative work, belong to the scope of protection of the invention.
Gamma-rays can occur photoelectric effect and produce passage of scintillation light after injecting scintillation crystal, after passage of scintillation light passes to photoelectric converter
Cause the avalanche breakdown of diode in photoelectric converter and produce electric signal.Believe at the time of electric signal produces for the time of signal
Breath, the size of electric signal then reflect original gamma-ray energy information, and the back-end circuit of photoelectric converter is used to obtain the time
With energy these two aspects information.
Lower mask body introduces the embodiment of the present invention.
Referring to Fig. 2, for the composition schematic diagram of the measuring device of ray energy provided in an embodiment of the present invention, the device bag
Include：Sequentially connected scintillation crystal 201, photoelectric converter 202, preamplifier 203, N nthdifferentials device 204,205 and of comparator
Thin interbed device 206, wherein, N >=1.
According to connection relation shown in Fig. 2, make the ray signal that receives by stepwise disposal, it is specific as follows：
The scintillation crystal 201, every ray for that will receive are converted into passage of scintillation light respectively；
The photoelectric converter 202, for the passage of scintillation light to be converted into electric signal；
The preamplifier 203, for amplifying the electric signal；
The N nthdifferentials device 204, for carrying out n times differential process to amplified electric signal；
The comparator 205, for compared with comparator threshold, foundation to compare knot by the electric signal after differential process
Fruit exports at least one pulse signal；
The Thin interbed device 206, for identifying going out current moment for first pulse signal, and from it is described go out current moment open
Begin to cut-off time to count the number of the pulse signal, the energy of the ray is determined according to the pulse number counted, its
In, at the time of the cut-off time is before the end time of electric signal decay or the end time.
Specifically, the cut-off time, can be to its attenuated output signal since photoelectric converter 202 exports signal
At the time of termination, or the setting to its attenuated output signal to its amplitude peak since photoelectric converter 202 exports signal
At the time of determining percentage (such as 90%).
Above-mentioned each device is specifically introduced below：
First, on scintillation crystal 201
Scintillation crystal 201, can be a crystal unit or using any arrangement form by multiple crystal lists
The crystal array of member composition, specifically, scintillation crystal 201 can be the crystal array of single or multiple lift, when the crystalline substance using multilayer
Can be same material crystal or material crystals not of the same race per layer crystal volume array during volume array.
The present embodiment is not defined the material of scintillation crystal 201, it can be that (BGO is Bi2O3-GeO2 systems to BGO
The abbreviation of the general name bismuth germanium oxide of compound) or yttrium luetcium silicate (Lutetium yttriumsilicate, abbreviation LYSO) or silicic acid
Lutetium (lutetium oxyorthosilicate, abbreviation LSO), etc..
2nd, on photoelectric converter 202
The present embodiment is not defined the form of photoelectric converter 202, it can be photomultiplier
(photomultiplier tube, abbreviation PMT) or avalanche photodide (Avalanche Photo Diode, referred to as
) or silicon photomultiplier (Silicom photomultiplier, abbreviation SiPM), etc. APD.
Wherein, SiPM is also known as MPPC (Multi-Pixel Photon Counter), is a kind of brand-new high sensitivity silicon
Photoelectricity photoelectric converter, this photoelectric converter are mainly the avalanche photodiode array structure by being operated under Geiger mode angular position digitizer
Into ripe day by day and price with SiPM technologies constantly declines, and SiPM is just promoting the revolutionary development of PET device.
SiPM has many advantages, such as a kind of new semiconductor light electric transducer compared to traditional PMT and APD：For example its is quick
Time resolution characteristics disclosure satisfy that the technical requirements of TOF-PET (time of flight, time flight)；SiPM is unwise to magnetic field
The characteristic of sense can combine PET and MRI (Magnetic Resonance Imaging, magnetic resonance imaging), form shadow of new generation
Ring product；SiPM compact structures and higher signal-to-noise ratio, substantially increase the spatial resolution of PET, its breakthrough is reached
The resolution ratio of submillimeter level is arrived.
3rd, on preamplifier 203
Photoelectric converter 202 export electric signal need by preamplifier 203 amplify certain multiple, be on the one hand for
The signal-to-noise ratio of electric signal is improved, is on the other hand to lift the amplitude of electric signal to reduce knowledge of the subsequent conditioning circuit to electric signal
Other difficulty.Moreover, preamplifier 203 should have wider bandwidth, (amplifier allows to be known as putting by the highest frequency of signal
The bandwidth of big device), which should adapt to the speed that photoelectric converter 202 exports electric signal.
For example, in advantage possessed by above-mentioned SiPM, SiPM has fast time response, refer to certain it is gamma-ray
After first photon reaches SiPM, the speed that first avalanche breakdown occurs inside SiPM and produces electric signal is exceedingly fast, but
It is that signal amplitude is minimum, however, in order to accurately measure gamma-ray energy size, it is necessary to which first photon of accurate discrimination reaches
The time (the purpose is to the energy of photon is measured since the time point) of SiPM, this just needs the scintillation crystal of SiPM front ends to have
There is larger light output, and the amplifying circuit of SiPM rear ends has larger gain (i.e. amplification factor) and bandwidth, can just make
The signal leading edge information produced into first photon of SiPM distortionless is extracted.
In addition, preamplifier 203 should close proximity to the exit of photoelectric converter 202, cabling be not easy it is long, so
The distortion level that preamplifier 203 exports signal can be reduced.
4th, on N nthdifferentials device 204
When N nthdifferentials device 204 is level-one differentiator, it is a differentiator that it, which is only included,；When N nthdifferentials device 304 is more
During nthdifferential device, it includes multiple differentiators being sequentially connected in series.Wherein, the differentiator can be as shown in Figure 3 micro-
Parallel circuit.
Energy information output schematic diagram shown in Figure 4, it is assumed that scintillation crystal 201 is LYSO, and photoelectric converter 202 is
SiPM, Fig. 4 then enter after SiPM the type signal exported for formation scintillation photons after gamma-rays injection LYSO and scintillation photons.
It can be seen from the figure that signal is with more burr, this is because a ray will form one after entering LYSO scintillation crystals 201
Serial photon, but the number of photons received by SiPM photoelectric converters 202 can be different at different moments, and this causes SiPM opto-electronic conversions
The signal that device 202 exports has sharp fluctuating.It should be noted that SiPM photoelectric converters 202 are received at different moments
All photon energies it is cumulative, then be to inject energy size possessed by the initial ray of LYSO scintillation crystals 201.
Based on " fluctuating " signal of above-mentioned SiPM photoelectric converters 202 output, the present embodiment can use N nthdifferential devices
204 detect these signals, and reason is as follows：
Since the differential circuit in analog circuit can take out the component being mutated in input signal, that is, take out in input signal
Radio-frequency component, remove low-frequency component in input signal, it is thereby achieved that the detection of the small slope variation of signal, and
The slope variation of input signal is bigger, and the output signal of differential circuit is more prominent.Turn when handling photoelectricity using N nthdifferentials device 204
During output signal (such as SiPM signals) of parallel operation 202, " fluctuating " information can be made more obviously to highlight in SiPM signals,
This " fluctuating " message reflection photon reaches the number of SiPM.Therefore, this implementation can will be after preamplifier 203 amplifies
Electric signal be input to N nthdifferentials device 204, it is assumed that N nthdifferentials device 204 is a second-order differential device, energy shown in Figure 5
Information exports schematic diagram, first, the SiPM original signals that photoelectric converter 202 exports is input to the first of N nthdifferentials device 204
Nthdifferential device, obtains level-one differential signal, it is seen then that, can be compared with by carrying out the differential process of first time to SiPM original signals
Significantly to show " fluctuating " information of SiPM original signals；Then, level-one differential signal is input to N nthdifferentials device 204
Second level differentiator, obtain second-order differential signal, it is seen then that by carrying out secondary differential process to SiPM original signals,
Signal can be made to form pulse type, and each pulse independence and peak value it is obvious, can be more obvious show the original letters of SiPM
Number " fluctuating " information.
In some embodiments, the N in N nthdifferentials device 204 can be N=1 or N=2 or N=3, the number of differentiator
It is not easy excessively, to be generally advisable for 1-3 grades, RC values need suitably to be chosen according to physical circuit in differentiator.
5th, on comparator 205
In the present embodiment, the output signal of the final stage differentiator of N nthdifferentials device 204 enters comparator 205, and the purpose is to shape
Into pulse signal.When the electric signal after final stage differential process is more than comparator threshold, high level signal is exported, when final stage differential
When electric signal after processing is not more than comparator threshold, low level signal is exported, forms pulse train signal as shown in Figure 6
Figure.
That is, the present embodiment is that the direct collection in the prior art to energy information is transformed into adopting for photon number
Collection, i.e. acquisition pulse number, therefore, using Fast Threshold comparator, and set certain threshold value thresholding, after a series of differential
Pulse carry out threshold value comparison obtain it is a series of cross threshold pulses, so as to rear end Thin interbed device 206 demarcate first cross threshold pulse
The arrival moment, and from the moment statistics it is all cross threshold pulses numbers as energy correlative, so as to fulfill time and energy
Synchronous acquisition.
Wherein, " fluctuating " information in order to export final stage differentiator is embodied as, and the comparator threshold is unsuitable
That chooses is excessive, such as, 1/10th peak value sizes that final stage differentiator exports differential signal can be chosen.
6th, on Thin interbed device 206
In some embodiments, the Thin interbed device 206 can be time-to-digit converter (Time-to-
Digital Converter, abbreviation TDC) or programmable gate array (Field-Programmable Gate Array,
Abbreviation FPGA).
In some embodiments, the Thin interbed device 206 can include：
Pulse is along recognition unit 2061, and for identifying the edge signal of each pulse signal, the edge signal is described
The rising edge or trailing edge of pulse signal or one section of permanent High level or one section of lasting low level；
Time recording unit 2062, goes out current moment for first edge signal of record；
Pulse statistic unit 2063, for going out current moment to the cut-off time from first edge signal, starts to unite
Count the number of the edge signal；
Thin interbed unit 2064, for determining the energy of the ray according to the edge number counted.
In the present embodiment, by identifying the edge signal of threshold pulse, recognize first edge signal is made
For signal initial time, to the cut-off time since the signal initial time, the number of all edge signals is counted, is counted
The edge total number gone out is pulse total number, using the pulse total number M counted as ray energy correlative, due to described
There is correlation between pulse total number M and ray energy, the energy size of initial ray can be determined according to M values.
Further, above-mentioned measuring device can also include：Relationship storage, for prestoring ray energy and pulse
Correspondence between number, then in some embodiments, the Thin interbed unit 2064, can be specifically used for according to institute
State correspondence and the edge number that counts determines the energy of the ray.
In this embodiment, since pulse number (the edge number the counted) M counted enters with ray
The number of photons W presentation proportional relationships actually produced after scintillation crystal 201, i.e. W=α * M, wherein, α is photon sensitivity coefficient；And
The gross energy E=β * W of ray, wherein, β is photon energy coefficient, it represents the energy size of a photon；In practical operation,
The ray signal of fixed energies can be gathered to demarcate the value of α * β, obtain the correspondence between ray energy and pulse number.
In practical applications, after the corresponding pulse of certain ray is counted along number, which is pulse number along number, inquiry
Correspondence between the ray energy and pulse number that prestore, obtains the corresponding radial energy of pulse number of current statistic
Value, the energy value are the energy size of the ray.
Further, due to the ray for not only including required measurement of injection scintillation crystal 201, it is also possible to including noise
Light in ray, such as cosmic ray, environment etc., in order to filter out these noise rays, the present embodiment can set energy cut-off
Value, screens all energy value E collected by energy threshold.Therefore, in the present embodiment, above-mentioned measuring device is also
It can include：Energy flush trimmer, for analyzing the corresponding energy size of every ray, rejects more than first threshold or is less than
The energy value of second threshold, wherein, the second threshold is less than the first threshold.
The measuring device of ray energy provided in an embodiment of the present invention, exports preamplifier using N nthdifferentials device
Electric signal carries out the differential process of n times, can be rendered obvious by the fluctuating information of preamplifier output electric signal, then passes through and compare
These fluctuating information are converted into multiple pulse signals by device, and this pulse signal can be relatively easy to identification by Thin interbed device
Arrive, and can be by counting pulse number come really based on the incidence relation between pulse number and ray energy, Thin interbed device
Determine the energy size of ray.As it can be seen that the present embodiment uses a link path, signal link is improved in link without branch
Signal-to-noise ratio and simplify circuit；In addition, determining ray energy by counting pulse number, pulse information is more prone to be known
Not, the requirement of high sampling rate when carrying out discrete acquisitions to energy information in the prior art is avoided, is adopted so as to save energy
The input cost of collector.
Referring to Fig. 7, for the flow diagram of the measuring method of ray energy provided in an embodiment of the present invention, the method should
For a kind of measuring device of ray energy, described device includes：Sequentially connected scintillation crystal, photoelectric converter, preceding storing
Big device, N nthdifferentials device, comparator and Thin interbed device, wherein, N >=1；The described method includes：
Step 701：The every ray received is converted into passage of scintillation light by the scintillation crystal respectively；
Step 702：The passage of scintillation light is converted into electric signal by the photoelectric converter；
Step 703：The preamplifier amplifies the electric signal；
Step 704：The N nthdifferentials device carries out n times differential process to amplified electric signal；
Step 705：For the comparator by the electric signal after differential process compared with comparator threshold, foundation compares knot
Fruit exports at least one pulse signal；
Step 706：The Thin interbed device identifies going out current moment for first pulse signal, and from it is described go out current moment open
Begin to cut-off time to count the number of the pulse signal, the energy of the ray is determined according to the pulse number counted, its
In, at the time of the cut-off time is before the end time of electric signal decay or the end time.
In some embodiments, step 706 can include：
Step 7061：Identify the edge signal of each pulse signal, the edge signal is the rising of the pulse signal
Edge or trailing edge or one section of permanent High level or one section of lasting low level；
Step 7062：First edge signal of record goes out current moment；
Step 7063：Go out current moment to the cut-off time from first edge signal, start to count the edge letter
Number number；
Step 7064：Edge number according to counting determines the energy of the ray.
In some embodiments, the method can also include：Prestore between ray energy and pulse number
Correspondence；Then step 7064 can include：The ray is determined according to the correspondence and the edge number counted
Energy.
In some embodiments, the Thin interbed device is time-to-digit converter TDC or programmable gate array
FPGA。
In some embodiments, N=1 or N=2 or N=3.
In some embodiments, the method can also include：The corresponding energy size of every ray is analyzed, is picked
Except the energy value more than first threshold or less than second threshold, wherein, the second threshold is less than the first threshold.
As seen through the above description of the embodiments, those skilled in the art can be understood that above-mentioned implementation
All or part of step in example method can add the mode of required general hardware platform to realize by software.Based on such
Understand, the part that technical scheme substantially in other words contributes the prior art can be in the form of software product
Embody, which can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, including some
Instruction is used so that a computer equipment (can be the network services such as personal computer, server, or Media Gateway
Equipment, etc.) perform method described in some parts of each embodiment of the present invention or embodiment.
It should be noted that for method disclosed in embodiment, due to its with embodiment disclosed in device it is corresponding,
So description is fairly simple, related part illustrates referring to device part.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in process, method, article or equipment including the key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (10)
- A kind of 1. measuring device of ray energy, it is characterised in that including：It is sequentially connected scintillation crystal, photoelectric converter, preceding Amplifier, N nthdifferentials device, comparator and Thin interbed device are put, wherein, N >=1；The scintillation crystal, every ray for that will receive are converted into passage of scintillation light respectively；The photoelectric converter, for the passage of scintillation light to be converted into electric signal；The preamplifier, for amplifying the electric signal；The N nthdifferentials device, for carrying out n times differential process to amplified electric signal；The comparator, for the electric signal after differential process compared with comparator threshold, to be exported according to comparative result At least one pulse signal；The Thin interbed device, for identifying going out current moment for first pulse signal, and since it is described go out current moment to cutting Only the moment counts the number of the pulse signal, and the energy of the ray is determined according to the pulse number counted, wherein, it is described At the time of cut-off time is before the end time of electric signal decay or the end time.
- 2. device according to claim 1, it is characterised in that the Thin interbed device includes：Pulse is along recognition unit, and for identifying the edge signal of each pulse signal, the edge signal is the pulse signal Rising edge or trailing edge or one section of permanent High level or one section of lasting low level；Time recording unit, goes out current moment for first edge signal of record；Pulse statistic unit, for going out current moment to the cut-off time from first edge signal, starts to count the side Along the number of signal；Thin interbed unit, for determining the energy of the ray according to the edge number counted.
- 3. the apparatus of claim 2, it is characterised in that described device further includes：Relationship storage, for prestoring the correspondence between ray energy and pulse number；Then, the Thin interbed unit, described in being determined according to the correspondence and the edge number counted The energy of ray.
- 4. device according to any one of claims 1 to 3, it is characterised in that the Thin interbed device turns for time figure Parallel operation TDC or programming logic gate array FPGA.
- 5. device according to any one of claims 1 to 3, it is characterised in thatN=1 or N=2 or N=3.
- 6. device according to any one of claims 1 to 3, it is characterised in that described device further includes：Energy flush trimmer, for analyzing the corresponding energy size of every ray, is rejected more than first threshold or less than second The energy value of threshold value, wherein, the second threshold is less than the first threshold.
- A kind of 7. measuring method of ray energy, it is characterised in that the method is applied to a kind of measuring device of ray energy, Described device includes：Sequentially connected scintillation crystal, photoelectric converter, preamplifier, N nthdifferentials device, comparator and energy Identifier, wherein, N >=1；The described method includes：The every ray received is converted into passage of scintillation light by the scintillation crystal respectively；The passage of scintillation light is converted into electric signal by the photoelectric converter；The preamplifier amplifies the electric signal；The N nthdifferentials device carries out n times differential process to amplified electric signal；Electric signal after differential process compared with comparator threshold, at least one is exported according to comparative result by the comparator A pulse signal；The Thin interbed device identifies going out current moment for first pulse signal, and since it is described go out current moment to cut-off time The number of the pulse signal is counted, the energy of the ray is determined according to the pulse number counted, wherein, during the cut-off At the time of quarter as before the end time of electric signal decay or the end time.
- 8. the method according to the description of claim 7 is characterized in that first pulse of the identification goes out current moment, and from institute Stating out current moment starts to count the number of the pulse signal, and the energy of the ray is determined according to the pulse number counted, Including：Identify the edge signal of each pulse signal, the edge signal for the pulse signal rising edge or trailing edge or One section of permanent High level or one section of lasting low level；First edge signal of record goes out current moment；Go out current moment to the cut-off time from first edge signal, start to count the number of the edge signal；Edge number according to counting determines the energy of the ray.
- 9. according to the method described in claim 8, it is characterized in that, the method further includes：Prestore the correspondence between ray energy and pulse number；Then, the edge number that the basis counts determines that the energy of the ray includes：The energy of the ray is determined according to the correspondence and the edge number counted.
- 10. method according to any one of claims 7 to 9, it is characterised in that the Thin interbed device turns for time figure Parallel operation TDC or programming logic gate array FPGA.
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