CN109581110A - Judge the method and detector gain method for correcting balance of detector gain state - Google Patents
Judge the method and detector gain method for correcting balance of detector gain state Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to the method for correcting balance of a kind of detector gain balance judgment method and detector gain.Described method includes following steps: using the crystal array of radiation source detector；Each road detectable signal that detector issues is amplified into shaping by amplification and rectification circuit；It is acquired using ADC capture card by the amplification road shaping Hou Ge detectable signal；By the collected each road detectable signal input computer storage analysis data module of ADC capture card, the crystal bar two-dimensional position image of detector is obtained；Fixed area position is chosen on the crystal bar two-dimensional position image of acquisition；The power spectrum of the crystal bar of each fixed area position is obtained, energy value is that the signal amplitude of each branch sums it up；The gain-state near tributary signal is judged according to the peak position position in the power spectrum of region, if each region power spectrum peak position is closer, the gain of the road Ze Ge signal is closer to balance.Method provided by the invention accuracy rate when the gain-state of detector judges is high, in addition easy to operate in detector gain balance correction, and calibration result accuracy is high.
Description
Technical field
The invention belongs to sensor technical field more particularly to a kind of methods and detector for judging detector gain state
Method for correcting gain balance.
Background technique
More photomultiplier tubes/silicon photo-multiplier measures by the technology of sharing of light and parses more massive detector
Crystal array, the gain balance (i.e. consistent state) of each electronics access determine the performance of detector.For example, it is a kind of by
The pet detector that four photomultiplier tubes are constituted, four road photomultiplier tube output gains balance, detector performance can be improved
Optimum state improves the key performances such as effective counter rate and the time resolution of entire PET system.
To guarantee that four photomultiplier tubes are in identical gain level, the confession of photomultiplier tube can be generally corresponded to by adjusting
Piezoelectric voltage mode or the amplifier gain amplifier multiple for adjusting corresponding photomultiplier tube, to guarantee the defeated of four road photomultiplier tubes
Gain balance out.It is the important indicator judgement mark for guaranteeing detector performance so how to judge four tunnel gain-states of detector
It is quasi-.
Since pet detector structure determines, the signal light that different location generates enters four after being divided by light guide
The luminous intensity of photomultiplier tube is, so the simple mode by comparing four road signal output sizes, can not judge four tunnels
Whether gain is consistent.
Summary of the invention
(1) technical problems to be solved
For existing technical problem, the present invention provides a kind of method and detector for judging detector gain state
Method for correcting gain balance, solves when judging in the prior art the gain-state of detector that accuracy rate is low, and causes to detect
Device gain balance corrects the technical problems such as result is undesirable.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of detector gain balance judgment method, by fixing crystal bar hair in detector array crystal bar two-dimensional position image
Each region power spectrum peak position of light judges whether the gain of each road signal of sensor balances；
If region power spectrum peak position is closer, the gain of the road Ze Ge signal is closer to balance.
Preferably, described method includes following steps:
101, using the crystal array of radiation source detector；
102, each road detectable signal that detector issues is amplified into shaping by amplification and rectification circuit；
103, it is acquired using ADC capture card by the amplification road shaping Hou Ge detectable signal；
104, it by the collected each road detectable signal input computer storage analysis data module of ADC capture card, is visited
Survey the crystal bar two-dimensional position image of device；
105, fixed area position is chosen on the crystal bar two-dimensional position image of acquisition；
106, the power spectrum of the crystal bar of each fixed area position is obtained；
107, the gain-state of nearest tributary signal is judged according to the peak position position in the power spectrum of region, if region power spectrum peak position
Closer, the gain of the road Ze Ge signal is closer to balance.
Preferably, the fixed area position is near electrooptical device, and the most sensitive region of influence.
Preferably, the irradiation source is Ge or other gamma ray sources.
Preferably, the detector is array type detector, such as pet detector, SPECT detector；
Each road detectable signal number of active lanes is the sensitive area number in array, such as the four-way of four photomultiplier tubes
The detector on road.
Preferably, the constituency of fixed area position influences sensitive region to position where photoelectric device, in the spy
When survey device is four-way pet detector, the fixed area position is four and is symmetrically arranged in the crystal bar two dimension respectively
Constituency in four quadrants of position images.
Preferably, the size selection crystal bar number corresponding to photoelectric device size of fixed area is related, such as 1 inch
PMT selectes 9 fixed crystal bars in each constituency of four quadrants.
Preferably, the detector crystal bar two-dimensional position image, is to obtain according to the following formula:
A, B, C and D respectively correspond the signal that four photomultiplier transit light measurements of detector obtain；A+B+C+D represents four tunnels
Signal adduction value.
This technology method also provides a kind of bearing calibration of detector gain balance based on above scheme, according to each region
Peak position position in power spectrum judges the gain-state of each road signal；
When the energy peak position difference in each region power spectrum, gain is obtained according to the quantization measured value of each region power spectrum peak position
Compensation rate needed for balancing the road Shi Ge；
According to compensation rate needed for obtained each road, electricity is amplified using the operating voltage or electronics of electrooptical device
The amplification coefficient on road is corrected the gain balance of detector.
Preferably, the method also includes: when the energy peak position in each region power spectrum is identical, complete correction.
(3) beneficial effect
The beneficial effects of the present invention are: a kind of method for judging detector gain state provided by the invention and detector increase
Beneficial method for correcting balance can judge each road gain-state by crystal bar two-dimensional position image state, by adjusting supply voltage side
Formula adjusts amplifier gain, and each road actual variance can theoretically be allowed to be finally less than 1%.
This method is also particularly useful in four road photomultiplier tubes/silicon photo-multiplier detector, passes through photomultiplier transit
The crystal bars gain of pipe/silicon photo-multiplier close association is modulated.
Detailed description of the invention
Fig. 1 is a kind of method for the method and detector gain method for correcting balance for judging detector gain state of the present invention
Flow diagram；
Fig. 2 be the present invention it is a kind of judge detector gain state method and detector gain method for correcting balance in, with
It detector crystal bar two-dimensional position image and fixes 9 crystal bars for four-way detector array, when gain complete equipilibrium and shines energy
Spectrum；
Fig. 3 be the present invention it is a kind of judge detector gain state method and detector gain method for correcting balance in, with
For four-way detector array, 9 crystal bar lighting energy spectrums are fixed；
Fig. 4 is the flow chart in a kind of method for judging detector gain state of the present invention；
Fig. 5 is a kind of method for judging detector gain state of the present invention and detects in detector gain method for correcting balance
The crystal bar two-dimensional position image schematic diagram of device original state and leveling state.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Embodiment one
Present embodiment discloses a kind of detector gains to balance judgment method, passes through detector array crystal bar two-dimensional position shadow
The luminous each region power spectrum peak position of crystal bar is fixed as in judges whether the gain of each road signal of sensor balances；If each region power spectrum
Peak position is closer, and the gain of the road Ze Ge signal is closer to balance.
It is noted that the number of each road signal described in the present embodiment, or perhaps the quantity of signal, with the spy
The quantity for surveying the photomultiplier tube of device is consistent, and when the quantity of the photomultiplier tube of detector is 4, detector exists at this time
Four road signals can be issued when by radiation source array crystal bar, with should photomultiplier tube be 3 when, the number of the signal is
Three tunnels.
In order to described in more detail, method described in the present embodiment includes the following steps: as shown in Figure 1:
101, using the crystal array of radiation source detector.
It should be noted that the radioactive source used in this step is with pet detector here for Ge-68 or other gamma ray sources
Example, using the Ge or the crystal array of other gamma ray sources irradiation pet detector.
102, each road detectable signal that detector issues is amplified into shaping by amplification and rectification circuit.
Pet detector in this step issues four road detectable signals and needs to amplify shaping by amplification and rectification circuit
Afterwards, it is acquired to ADC capture card.
103, it is acquired using ADC capture card by the amplification road shaping Hou Ge detectable signal.
104, it by the collected each road detectable signal input computer storage analysis data module of ADC capture card, is visited
Survey the two-dimensional position image of the crystal bar of device.
Collected four road detectable signal is input in computer storing data module by the ADC capture card in this step,
The method for analyzing the relative CG of signal obtains location information, and the Two-dimensional Position for obtaining the crystal bar of pet detector is analyzed by data
Image is set, can judge whether each road gain-state of sensor balances by the qualitative understanding of symmetry.
105, fixed area position is chosen on the crystal bar two-dimensional position image of acquisition.
It is noted that fixed area position described in this step is four is symmetrically arranged in the crystal bar two respectively
Tie up the constituency in four quadrants of position images.9 fixed crystal bars are selected in each constituency of four quadrants.
Certainly, detector described in the present embodiment is the detector of four photomultiplier tubes, when photomultiplier tube is 3
When, here be chosen for three points of quadrants, wherein each quadrant, which occupies 120 ° of fixations, is chosen for 3 regions.General area number light
The number of electric multiplier tube is identical, the corresponding crystal item of photoelectricity sensitive area of the position constituency in region in electric multiplier tube.
106, the power spectrum of the crystal bar of each fixed area position is obtained.
It is noted that further data are analyzed in analysis storage, the event of the crystal bar of each fixed area position will be met
Energy information carry out tired spectrum, obtain each region power spectrum of crystal bar.
107, the gain-state near shortcut signal is judged according to the peak position position in the power spectrum of region, if each region can spectral peak
Position is closer, and the gain of the road Ze Ge signal is closer to balance.
When the peak position of each region power spectrum is overlapped, the gain of the road Ze Ge signal reaches balance.
Fixed area position described in the present embodiment is near electrooptical device, and the most sensitive region of influence.
Finally, it should be noted that the two-dimensional position image of detector crystal bar described in the present embodiment, is to obtain according to the following formula
It arrives:
A, B, C and D respectively correspond the signal that four photomultiplier transit light measurements of detector obtain；A+B+C+D represents four tunnels
Signal adduction value.
The present embodiment also provides a kind of bearing calibration of detector gain balance, is sentenced according to the peak position position in the power spectrum of region
The disconnected gain-state near tributary signal；
When the energy peak position difference in each region power spectrum, gain is obtained according to the quantization measured value of each region power spectrum peak position
Compensation rate needed for balancing the road Shi Ge；
According to compensation rate needed for obtained each road, electricity is amplified using the operating voltage or electronics of electrooptical device
The amplification coefficient on road is corrected the gain balance of detector.
When the energy peak position in each region power spectrum is identical, correction is completed.
Embodiment two
The present invention provides a kind of methods for judging detector gain state.Pass through the crystal bar two-dimensional position image to acquisition
It is analyzed, judges the gain of photomultiplier state of detector.Illustrate by taking the detector of four PMT as an example below.
Detector crystal bar two-dimensional position image, is obtained according to formula:
A, B, C and D respectively correspond the signal that four photomultiplier transit light measurements of detector obtain；A+B+C+D represents four tunnels
Signal adduction value.
As shown in Fig. 1 left figure, each puts on corresponding crystal array the crystal bar two-dimensional position image of four-path balance detector
A crystal bar.It is the luminous signal size of crystal bar, the adduction of a crystal bar that four road signal adduction values of every crystal bar are corresponding
Value carries out tired spectrum, obtains a luminous spectrum, the peak in spectrum, the 511KeV photon or other gamma ray sources that corresponding Ge radioactive source issues
Full energy peak.Since the intrinsic difference of crystal bar, and different crystal bars shine and reach the optical path difference of photomultiplier tube, the hair of every crystal bar
Spectrum peak position is different.
If four quadrants of four tunnel complete equipilibrium of detector, crystal bar two-dimensional position image are also full symmetric, crystalline substance is not considered
The intrinsic difference of item, the crystal bar power spectrum peak position of symmetric position should be identical in four-quadrant, so choosing symmetrical in four-quadrant
Fixed area crystal bar lighting energy spectrum peak position state, the gain of the corresponding photomultiplier tube of the quadrant can be characterized.Such as Fig. 2 institute
Show, which is a four-path balance detector, is had chosen such as 9 fixed points in Fig. 3, and four region power spectrum peak positions almost weigh
It closes, the counting in power spectrum is also of substantially equal.
Select fixed area position principle:
(1) electrooptical device is chosen near the most sensitive region of influence.
For quadrangle crystal bar is leaned in selection as far as possible for the detector on four tunnels, the differentia influence of photomultiplier tube is more by quadrangle
Can be more significant, because relatively close to corresponding photomultiplier tube, while again far from other photomultiplier tubes, other photomultiplier tubes
Influence it is minimum, since test macro has a fixed error, more significant difference (more) be not easy tested systematic error covering.
(2) it does not select outmost turns crystal bar as far as possible, is because detector process is possible to outmost turns crystal bar and has that lose light existing
As, this light of losing is that light leakage causes, will cause the crystal bar lighting energy spectrum peak position value uncertainty decline, in order to avoid it is this not
Determination has an impact judgement, does not select outmost turns crystal that judgement is added.
(3) fixed crystal bar quantity is selected, is statistical demand, it can be according to using radiation intensity and distance and crystal equal
The actual conditions such as evenness increase or reduce fixed crystal bar quantity.Individual crystal bar lighting energy spectrum peak positions are relatively low or higher, pass through
More average, can reduce the influence that the random higher or relatively low bring of crystal bar judges gain of photomultiplier.Increase crystal bar
The statistic for increasing event while quantity when test obtains data, reduces partial test error, but if selection is consolidated
It is excessive to determine crystal bar quantity, then it can be with principle (1) contradiction.
A kind of method judging detector gain state provided in this embodiment.Pass through the detector of four road photomultiplier tubes
For be illustrated, it is described in detail below.
Detector crystal array is irradiated using Ge or other gamma ray sources, by four road signals by using after amplification shaping
ADC is obtained, and computer stored analyzes data.
Analysis obtains the crystal bar two-dimensional position image of this detector first, according to crystal bar two-dimensional position image, selects solid
Determine crystal bar event, generate the look-up table of every crystal bar two-dimensional position image, or event area is delineated by two-dimensional position image.
Further analysis storage analysis data will meet the fixed crystal bar event of four angular zones and carry out tired spectrum.
Process is as shown in figure 4, finally judge four tunnel gain-states according to the peak position position in four region power spectrums.
Four region power spectrum peak positions are closer, illustrate that four tunnel signal gains are closer, such as Fig. 3.Pass through crystal bar two-dimensional position shadow
As that can also go out whether four tunnel gains balance with intuitive judgment.
In crystal bar two-dimensional position image, it is mainly that four tunnel gains are inconsistent that four symmetric quadrants account for area discrepancy in image
It causes, it is smaller that area gets over large gain, and as shown in Fig. 5 left figure, the angle A occupied area in four quadrants is maximum, and the angle C and D is at four
The area accounted in quadrant is minimum, so the gain of the angle A is minimum, the gain of the angle C and D is maximum.
The equilibrium state of gain is delicately embodied on the energy peak of tired out power spectrum, the different i.e. imbalance in energy peak position,
The quantization measured value of peak position can be estimated to balance the size of the compensation rate of required gain, and compensation rate is passed through photoelectric converter
The amplification coefficient of the electronics amplifying circuit of the operating voltage or access of part is corrected.
Judged according to quadrangle gain-state, use experience formula, which calculates, to be adjusted the raising of four road Photomultiplier tube voltages or reduce
Corresponding road gain keeps four region power spectrum peak positions close, and four-quadrant balances in final crystal bar two-dimensional position image.Fig. 5 left figure is four
The unbalanced detector crystal bar two-dimensional position image of road gain, Fig. 5 right figure are to judge four tunnel gain-states by the method for the invention,
After adjust four Lu Zengyi, crystal bar two-dimensional position image state after final four tunnel is in a basic balance.
The technical principle of the invention is described above in combination with a specific embodiment, these descriptions are intended merely to explain of the invention
Principle shall not be construed in any way as a limitation of the scope of protection of the invention.Based on explaining herein, those skilled in the art
It can associate with other specific embodiments of the invention without creative labor, these modes fall within this hair
Within bright protection scope.
Claims (10)
1. a kind of detector gain balances judgment method, which is characterized in that
Judge that sensor is each by the power spectrum peak position that each fixed area crystal bar in detector array crystal bar two-dimensional position image shines
Whether the gain of road signal balances；
If each region power spectrum peak position is closer, the gain of the road Ze Ge signal is closer to balance.
2. gain balance judgment method according to claim 1, which is characterized in that described method includes following steps:
101, using the crystal array of radiation source detector；
102, each road detectable signal that detector issues is amplified into shaping by amplification and rectification circuit；
103, it is acquired using ADC capture card by the amplification road shaping Hou Ge detectable signal；
104, by the collected each road detectable signal input computer storage analysis data module of ADC capture card, detector is obtained
Crystal bar two-dimensional position image；
105, fixed area position is chosen on the crystal bar two-dimensional position image of acquisition；
106, the power spectrum of the crystal bar of each fixed area position is obtained；
107, the gain-state near tributary signal is judged according to the peak position position in the power spectrum of region, if each region power spectrum peak position
Closer, the gain of the road Ze Ge signal is closer to balance.
3. the judgment method of gain balance according to claim 2, which is characterized in that
The fixed area position is near electrooptical device, and the most sensitive region of influence.
4. the judgment method of gain balance according to claim 3, which is characterized in that
The irradiation source is Ge or other gamma ray sources.
5. the judgment method of gain balance according to claim 4, which is characterized in that
The detector is array type detector；
Each road detectable signal number of active lanes is the sensitive area number in array.
6. the judgment method of gain balance according to claim 5, which is characterized in that
The constituency of fixed area position influences sensitive region to position where photoelectric device, is four-way in the detector
Pet detector when, the fixed area position be four be symmetrically arranged in the crystal bar two-dimensional position image respectively
Constituency in four quadrants.
7. the judgment method of gain balance according to claim 6, which is characterized in that
The size selection crystal bar number corresponding to photoelectric device size of fixed area is related, when the size of the pet detector
When being 1 inch, 9 fixed crystal bars are selected in each constituency of four quadrants.
8. the judgment method of gain balance according to claim 7, which is characterized in that the detector crystal bar two-dimensional position
Image is to obtain according to the following formula:
A, B, C and D respectively correspond the signal that four photomultiplier transit light measurements of detector obtain；A+B+C+D represents four road signals
Adduction value.
9. a kind of bearing calibration of the detector gain balance based on any one of claim 1-8 the method, which is characterized in that
The gain-state of nearest branch road signal is judged according to the peak position position in the power spectrum of region；
When the energy peak position difference in each region power spectrum, gain balance is obtained according to the quantization measured value of each region power spectrum peak position
When each signal road needed for compensation rate；
According to compensation rate needed for obtained each road, using the operating voltage or electronics amplifying circuit of electrooptical device
Amplification coefficient is corrected the gain balance of detector.
10. bearing calibration according to claim 9, which is characterized in that
The method also includes: when the energy peak position in each region power spectrum is identical, complete correction.
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Cited By (4)
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| CN109507714A (en) * | 2018-12-27 | 2019-03-22 | 江苏赛诺格兰医疗科技有限公司 | A kind of detector gain state quick judgment method |
| CN111025369A (en) * | 2019-12-23 | 2020-04-17 | 赛诺联合医疗科技（北京）有限公司 | Method for correcting timing precision by using energy information in PET system |
| CN112882081A (en) * | 2021-01-13 | 2021-06-01 | 明峰医疗系统股份有限公司 | PET detector full-channel gain calibration method |
| CN114384099A (en) * | 2021-12-31 | 2022-04-22 | 江苏赛诺格兰医疗科技有限公司 | Device and method for detecting on-off of silicon photomultiplier array signal |
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| CN114384099A (en) * | 2021-12-31 | 2022-04-22 | 江苏赛诺格兰医疗科技有限公司 | Device and method for detecting on-off of silicon photomultiplier array signal |
| CN114384099B (en) * | 2021-12-31 | 2023-09-12 | 江苏赛诺格兰医疗科技有限公司 | Device and method for detecting on-off of silicon photomultiplier array signals |
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Application publication date: 20190405 |