CN104586414B - A kind for the treatment of method and apparatus of pileup pulse signal - Google Patents
A kind for the treatment of method and apparatus of pileup pulse signal Download PDFInfo
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- CN104586414B CN104586414B CN201410836125.8A CN201410836125A CN104586414B CN 104586414 B CN104586414 B CN 104586414B CN 201410836125 A CN201410836125 A CN 201410836125A CN 104586414 B CN104586414 B CN 104586414B
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Abstract
The embodiment of the invention discloses a kind of processing method of pileup pulse signal, methods described includes：Obtain pulse signal；Pulse signal is divided into into two sections, wherein, first paragraph pulse signal is that the pulse signal for continuously dropping to peak value is produced to first voltage from pulse signal, the peak value in the first preset range, second segment pulse signal be in pulse signal in addition to the first pulse signal remaining pulse signal；Calculate corresponding first energy value of first paragraph pulse signal and corresponding second energy value of second segment pulse signal；Energy ratio is calculated, the energy ratio is the ratio of first energy value and second energy value；Judge the energy ratio whether in the range of first threshold；If it is, the pulse signal is identified as pileup pulse signal.The embodiment of the invention also discloses a kind of processing meanss of pileup pulse signal.The significantly more efficient identification pulse pile-up signal of the present invention, reduces the bit error rate of system, improves the quality of image.
Description
Technical field
The present invention relates to core medical field, more particularly to a kind for the treatment of method and apparatus of pileup pulse signal.
Background technology
Nuclear medicine facility is testing equipment medically conventional at present, for example, single electron transmitting computerized tomography (SPECT)
Equipment, positron emission tomography (PET) equipment etc..Nuclear medicine facility can be by the medicine containing radionuclide in body
Interior distribution forms image, and the image can reflect body metabolism, function of organization and configuration.
In nuclear medicine facility, the part of core is nuclear detector the most, and the part is used for detection to be introduced in sufferer body
The ray (such as gamma-rays) sent by radionuclide.Nuclear detector is typically by scintillation crystal array, photomultiplier tube and phase
Three part of electronic machine answered constitutes, and its course of work is：The interaction of radioprotective and some scintillation crystals can make its ionization,
Excite and launch fluorescence.Photon is projected the photomultiplier transit being connected with photoconduction using the light collector that photoconduction is constituted with reflector
On the photocathode of pipe, photoelectron is hit, photoelectron is doubled in photomultiplier tube, accelerated, and current impulse is formed on anode
Output, the height of current impulse are directly proportional to the energy of ray, the light of the number and radiation source incidence scintillation crystal of current impulse
Son output is directly proportional.
Ideally, only there is a nuclear decay event in a signal of telecommunication cycle, that is, produce a pulse, however,
When the radiopharmaceutical dosage for injecting patient increases, the probability that decay occurs is consequently increased, therefore a signal of telecommunication week
The event that two and the above are might have in phase occurs, that is, produce the pulse of two and the above, and this phenomenon is called pulse signal
Accumulation.
Due to there occurs that two of accumulation and the pulse signal of the above can occur superposition, therefore the energy value after being superimposed can compare
The energy value of wherein any one pulse signal is all big, and the pulse signal of superposition is more, and the energy after superposition is higher.Existing skill
In art, by set an energy threshold, higher than the energy threshold pulse signal be considered as there occurs accumulation pulse letter
Number.But, as pulse signal energy has certain discreteness, for those there occurs accumulation, energy is but still in energy
Accumulation signal within threshold value cannot be identified using traditional method, therefore prior art None- identified goes out in energy
There is situation about piling up in the pulse signal within threshold value, cause to reduce the quality of image, even affect doctor to disease when serious
The diagnosis of disease.
The content of the invention
In order to solve in prior art as the pulse signal that None- identified goes out within energy threshold occurs the feelings piled up
The technical problem of condition and caused image degradation, the invention provides the processing method and dress of a kind of pileup pulse signal
Put, realize the identification of larger range of pileup pulse signal, improve the quality of image, be easy to doctor to disease more accurately
Diagnosis.
A kind of processing method of pileup pulse signal is embodiments provided, methods described includes：
Obtain pulse signal；
The pulse signal is divided into into two sections, wherein, first paragraph pulse signal is to produce to first from the pulse signal
Individual voltage continuously drops to the pulse signal of peak value, and in the first preset range, second segment pulse signal is described to the peak value
In pulse signal in addition to first pulse signal remaining pulse signal；
Calculate corresponding first energy value of the first paragraph pulse signal and the second segment pulse signal corresponding second
Energy value；
Energy ratio is calculated, the energy ratio is the ratio of first energy value and second energy value；
Judge the energy ratio whether in the range of first threshold；
If it is, the pulse signal is identified as pileup pulse signal.
Preferably, the pileup pulse signal is abandoned.
Preferably, first energy value is directly proportional to the integrated value of time to the first paragraph pulse signal；
Second energy value is directly proportional to the integrated value of time to the second segment pulse signal.
Preferably, first energy value is directly proportional to the summation of each sampled voltage in the first paragraph pulse signal；
Second energy value is directly proportional to the summation of each sampled voltage in the second segment pulse signal.
Preferably, after the step of the acquisition pulse signal, methods described also includes：
Calculate the total energy value of the pulse signal；
Judge the total energy value whether in the range of Second Threshold；
If it is, carrying out described the step of the pulse signal is divided into two sections.
Preferably, when judging the total energy value not in the Second Threshold scope, methods described includes：
The pulse signal is abandoned.
Preferably, the total energy value is directly proportional to the integration of time to the pulse signal.
Preferably, the pulse signal is superimposed by N number of pulse signal, and N number of pulse signal is by N number of photoelectricity
Multiplier tube is exported simultaneously, wherein, N >=1；
Methods described also includes：
Determine the pulse pile-up moment, and the pulse signal is corrected according to the pulse pile-up moment.
Preferably, it is described to determine that the pulse pile-up moment includes：
From the beginning of the starting point of the second segment pulse signal, the pulse letter that first voltage continuously drops to peak value is searched
Number, the peak value is in the second preset range, and it is right that the voltage is continuously dropped to the starting point institute of the pulse signal of peak value
The time point answered is used as the pulse pile-up moment.
Preferably, it is described according to the pulse pile-up moment pulse signal is corrected including：
The pulse signal in the pulse pile-up moment as one signal period of bound pair is divided, will be described
Part of the pulse signal before the pulse pile-up moment with when is used as first paragraph pulse signal, and sectors punching is believed
The part terminated to the signal period number after the pulse pile-up moment is used as second segment pulse signal；
When the pulse pile-up moment is after the midpoint of the signal period, then according to correction coefficient to first paragraph sectors
Rush signal to be corrected；
When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient to the second segment
Pulse signal is corrected.
Preferably, it is described when the pulse pile-up moment is after the midpoint of the signal period, then according to correction coefficient
First paragraph pulse signal is corrected；When the pulse pile-up moment is before the midpoint of the signal period, then basis
Correction coefficient is corrected specially to the second segment pulse signal：
Wherein, the gross energy of the pulse signal is directly proportional to E (x), and the τ is correction coefficient, described
T be the pulse pile-up moment, the T be the signal period, the xiFor the magnitude of voltage at the i-th moment.
Preferably, when the pulse pile-up moment is after the midpoint of the time period that the pulse signal is crossed over, the side
Method also includes：Abandon the second segment pulse signal；
When the pulse pile-up moment is before the midpoint of the time period that the pulse signal is crossed over, methods described is also wrapped
Include：Abandon the first paragraph pulse signal.
The embodiment of the present invention additionally provides a kind of processing meanss of pileup pulse signal, and described device includes：Acquiring unit,
Segmenting unit, the first computing unit, the second computing unit, the first judging unit and recognition unit；
Wherein, the acquiring unit is connected with the segmenting unit, and the segmenting unit is connected with first computing unit
Connect, first computing unit is connected with second computing unit, second computing unit and first judging unit
Connection, first judging unit are connected with the recognition unit；
The acquiring unit, for obtaining pulse signal；
The segmenting unit, for the pulse signal is divided into two sections, wherein, first paragraph pulse signal is from the arteries and veins
Rush signal and produce to first voltage the pulse signal for continuously dropping to peak value, the peak value in the first preset range, second
Section pulse signal be the pulse signal in addition to first pulse signal remaining pulse signal；
First computing unit, for calculating corresponding first energy value of the first paragraph pulse signal and described second
Corresponding second energy value of section pulse signal；
Second computing unit, for calculating energy ratio, the energy ratio is first energy value and described second
The ratio of energy value；
First judging unit, for judging the energy ratio whether in the range of first threshold, if it is, swashing
The work recognition unit；
The recognition unit, for the pulse signal is identified as pileup pulse signal.
Preferably, the pulse signal is superimposed by N number of pulse signal, and N number of pulse signal is by N number of photoelectricity
Multiplier tube is exported simultaneously, wherein, N >=1；
Described device also includes：Determining unit and correction unit；
The recognition unit is connected with the determining unit, and the determining unit is connected with the correction unit；
The determining unit, for determining the pulse pile-up moment；
The correction unit, for being corrected to the pulse signal according to the pulse pile-up moment.
Preferably, the determining unit, for determining that the pulse pile-up moment includes：
The determining unit, the starting point for the second segment pulse signal start, under first voltage of lookup is continuous
The pulse signal of peak value is dropped to, the peak value is in the second preset range, and the voltage is continuously dropped to the pulse of peak value
Time point corresponding to the starting point of signal is used as the pulse pile-up moment.
Preferably, the correction unit, for being corrected to the pulse signal according to the pulse pile-up moment
Including：
The correction unit, believes for the sectors punching in the pulse pile-up moment as one signal period of bound pair
Number divided, using the pulse signal before the pulse pile-up moment and when part believe as the punching of first paragraph sectors
Number, and the part that the pulse signal terminated to the signal period after the pulse pile-up moment is believed as the punching of second segment sectors
Number；When the pulse pile-up moment is after the midpoint of the signal period, then the punching of first paragraph sectors is believed according to correction coefficient
Number it is corrected；When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient to described
Two-stage nitration pulse signal is corrected.
Relative to prior art, it is an advantage of the current invention that：
The pulse signal is divided into two sections by obtaining pulse signal by the present invention, calculates the first paragraph pulse signal
Corresponding first energy value and corresponding second energy value of the second segment pulse signal, and calculate first energy value and institute
The energy ratio of the second energy value is stated, the energy ratio is judged whether in the range of first threshold, if it is, by the pulse
Signal identification is pileup pulse signal, and accordingly, with respect to prior art, the present invention not only can recognize the heap higher than energy threshold
Product pulse signal, may recognize that the pileup pulse signal less than energy threshold, so as to significantly more efficient identification pulse pile-up
Signal, reduces the bit error rate of system, improves the quality of image.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Can be with according to these other accompanying drawings of accompanying drawings acquisition.
A kind of flow chart of the processing method embodiment one of pileup pulse signal that Fig. 1 is provided for the present invention；
Pulse signal schematic diagram in the processing method embodiment one of the pileup pulse signal that Fig. 2 is provided for the present invention；
Pulse letter in the processing method embodiment one of the pileup pulse signal that Fig. 3 is provided for the present invention in practical situation
Number；
A kind of flow chart of the processing method embodiment two of pileup pulse signal that Fig. 4 is provided for the present invention；
Energy distribution rectangular histogram in the processing method embodiment two of the pileup pulse signal that Fig. 5 is provided for the present invention；
Energy-integration in the processing method embodiment two of the pileup pulse signal that Fig. 6 is provided for the present invention compares scatterplot；
Two median sector of processing method embodiment of the pileup pulse signal that Fig. 7 is provided for the present invention rushes the correction side of signal
Method；
Two median sector of processing method embodiment of the pileup pulse signal that Fig. 8 is provided for the present invention rushes signal schematic representation；
A kind of structured flowchart of the processing meanss embodiment one of pileup pulse signal that Fig. 9 is provided for the present invention；
A kind of structured flowchart of the processing meanss embodiment two of pileup pulse signal that Figure 10 is provided for the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only this
Invent a part of embodiment, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of not making creative work, belongs to the scope of protection of the invention.
Embodiment of the method one：
A kind of one flow chart of processing method embodiment of the pileup pulse signal provided for the present invention referring to Fig. 1, the figure.
The pulse pile-up processing method that the present embodiment is provided comprises the steps：
Step S101：Obtain pulse signal.
Scintillation crystal array is made up of the interior scintillation crystal unit for being carved with some deep mixed light splitting grooves one by one, when
γ photons are incided after scintillation crystal array inspires visible ray, and the visible ray is entered by light splitting groove or photoconduction according to a certain percentage
Row light splitting, is all received by corresponding photomultiplier tube respectively per beam photoelectron, the multiplication, acceleration through photomultiplier tube, in sun
Respective current pulse signal output is formed on extremely, our this respective current pulse signals are called pulse signal.It is described
Pulse signal is used to calculate in scintillation crystal array by the position coordinateses of the scintillation crystal of photon strikes.In the present embodiment,
The pulse signal refers to the superposition of the pulse signal that all photomultiplier tubes are exported in same amount of time, and these sectors are rushed
The starting point time of signal is consistent with the terminating point time, but waveform may be identical, it is also possible to different.
It is the time that pulse signal after the superposition of these pulse signals is displayed in its abscissa on two-dimensional coordinate axle, vertical coordinate
For voltage, the voltage is negative value.
Step S102：The pulse signal is divided into into two sections.
The pulse signal is divided into two sections by the present embodiment, and first paragraph pulse signal is to produce to from the pulse signal
One voltage continuously drops to the pulse signal of peak value, the peak value in the first preset range, the first paragraph pulse signal
Pulse front edge can be become；Second segment pulse signal is the remaining pulse in addition to first pulse signal in the pulse signal
Signal.
Referring to Fig. 2, the figure is the schematic diagram of the pulse signal, from this figure, it can be seen that producing from the pulse signal
Elapse over time afterwards, voltage continuous decrease, until one peak value of arrival, then backward, voltage bottom out, and ging up one section
Decline after time again, until reaching another peak value, then go up again.Wherein, the pulse signal is from starting to first
, used as first paragraph pulse signal, remaining pulse signal is used as second segment pulse signal for peak value.
It should be noted that as Fig. 2 is only the schematic diagram of pulse signal, in actual applications, the waveform of pulse signal
May be for, shown in Fig. 3, the abscissa of the figure be the time, and unit is ns, and vertical coordinate is voltage, and unit is mV.Fig. 3 can be seen that
The initial stage produced in pulse signal generates some less fluctuations, therefore some peak values also occur, but these peak values are simultaneously
It is not for the peak value being segmented in the present embodiment, under the peak value for being segmented has obviously for first voltage
The peak value of drop, as described in Figure 3.Therefore, in order to these useless peak values that the peak value of needs and initial stage produce are distinguished, draw
Enter the first preset range, be just the present embodiment need from first peak value for meeting first preset range after pulse signal generation
The peak value wanted.
The present invention is not specifically limited to first preset range, and those skilled in the art can according to actual needs certainly
Row setting.
Step S103：Calculate corresponding first energy value of the first paragraph pulse signal and the second segment pulse signal pair
The second energy value answered.
In a kind of implementation of the present embodiment, first energy value is with the first paragraph pulse signal to the time
Integrated value is directly proportional；Second energy value is directly proportional to the integrated value of time to the second segment pulse signal.
In another middle implementation of the present embodiment, in first energy value and the first paragraph pulse signal each
The summation of sampled voltage is directly proportional；The summation of second energy value and each sampled voltage in the second segment pulse signal into
Direct ratio.
Certainly, two kinds of implementations that the present embodiment is provided do not constitute limitation of the invention, those skilled in the art
Can be according to practical situation designed, designed.
Step S104：Energy ratio is calculated, the energy ratio is the ratio of first energy value and second energy value.
When first energy value is directly proportional to the integrated value of time to the first paragraph pulse signal, second energy
When value is directly proportional to the integrated value of time to the second segment pulse signal, the energy ratio is equal to the first paragraph pulse signal
Ratio to the integrated value of time with the second segment pulse signal to the integrated value of time.
When first energy value is directly proportional to the summation of each sampled voltage in the first paragraph pulse signal, described
When two energy values are directly proportional to the summation of each sampled voltage in the second segment pulse signal, the energy ratio is equal to described the
The ratio of the summation of each sampled voltage and the summation of each sampled voltage in the second segment pulse signal in one section of pulse signal
Value.
Certainly, definition of the present embodiment to the energy ratio does not constitute limitation of the invention, those skilled in the art
Can be determined with the definition of the second energy value according to first energy value.
Step S105：The energy ratio is judged whether in the range of first threshold, if it is, carrying out step S106.
The first threshold scope is the scope at energy ratio of the pulse signal in the case where occurring to pile up.Obtain
The first threshold scope can obtain pulse signal energy ratio in the case where not occurring to pile up by many experiments first
Second Threshold scope, then by the Second Threshold scope determining the first threshold scope.For example, normally
Pulse signal (do not occur pile up pulse signal) energy ratio is in the range of 0.9～3.0, then the first threshold model
Enclose can determine be less than 0.9 in the range of.
Hereafter by way of example come illustrate why the first threshold scope determine in the range of less than 0.9 and not
It is greater than 3.0 scope.
Assume that the pulse signal F is formed by stacking by pulse signal A and pulse signal B, if not there is superposition, the arteries and veins
The first paragraph pulse signal of signal A is rushed by a1Represent, corresponding first energy value is Ea1, the second segment arteries and veins of the pulse signal A
Signal is rushed by a2Represent, corresponding second energy value is Ea2；The first paragraph pulse signal of the pulse signal B is by b1Represent, phase
The first energy value answered is Eb1, the second segment pulse signal of the pulse signal B is by b2Represent, corresponding second energy value is
Eb2.After superposition, the first paragraph pulse signal of the pulse signal F is by f1Represent, corresponding first energy value is Ef1, the arteries and veins
The second segment pulse signal of signal F is rushed by f2Represent, corresponding second energy value is Ef2。
In actual applications, due to the b1With a2The probability for overlapping is higher, the b2May be with a2Occur folded
Plus, it is also possible to there is no superposition, therefore the f1With a1It is identical, the f2For the b1、b2And a2Superposition, therefore, Ef1
Equal to Ea1, and Ef2More than Ea2, so Ef1/Ef2Less than Ea1/Ea2。
Backward, it is assumed that there occurs the less b of probability1With a1The situation of superposition, due to f1Duration is often much smaller than
f2Duration, therefore Ef1Relative to Ea1(or Eb1) increased energy is far smaller than Ef2Relative to Ea2(or Eb2) increase
Energy, therefore Ef1/Ef2Ea is less than also1/Ea2(or Eb1/Eb2)。
Therefore, if the pulse signal occurs to pile up, probability of the energy ratio less than 0.9 is very big.
Step S106：The pulse signal is identified as into pileup pulse signal.
The pulse signal is divided into two sections by obtaining pulse signal by the present invention, calculates the first paragraph pulse signal
Corresponding first energy value and corresponding second energy value of the second segment pulse signal, and calculate first energy value and institute
The energy ratio of the second energy value is stated, the energy ratio is judged whether in the range of first threshold, if it is, by the pulse
Signal identification is pileup pulse signal, and accordingly, with respect to prior art, the present invention not only can recognize the heap higher than energy threshold
Product pulse signal, may recognize that the pileup pulse signal less than energy threshold, so as to significantly more efficient identification pulse pile-up
Signal, reduces the bit error rate of system, improves the quality of image.
Embodiment of the method two
The present embodiment is differred primarily in that with embodiment of the method one：Realize to pileup pulse signal in embodiment of the method one
After being identified, the pileup pulse signal can be processed, the present embodiment provides one kind to the pileup pulse signal
The method for being processed.
Referring to Fig. 4, the figure is a kind of processing method embodiment two of pileup pulse signal provided in an embodiment of the present invention
Flow chart.
The processing method of the pileup pulse signal that the present embodiment is provided comprises the steps：
Step S201：Obtain pulse signal.
Step S202：Calculate the total energy value of the pulse signal.
In the present embodiment, the total energy value is directly proportional to the integrated value of time to the pulse signal.Certainly, this reality
The definition that example is applied with regard to total energy value does not constitute limitation of the invention, the total energy value can with the pulse signal
In the summation of each sampled voltage be directly proportional etc., be specifically determined by those skilled in the art according to the actual requirements.
Step S203：The total energy value is judged whether in the range of Second Threshold, if it is, carrying out step S204；
If it is not, then the pulse signal is abandoned.
In actual applications, directly can be abandoned after the pileup pulse signal is identified.But in the present embodiment
In, the pileup pulse signal of different range is respectively processed.
For example, referring to Fig. 5, the figure is Energy distribution rectangular histogram, also referred to as energy spectrum diagram, and its abscissa is pulse signal
Total energy value, vertical coordinate are counting.Wherein, Compton scattering (Compton Scattering) refers to γ photons and atom outermost
There is elastic collision in shell electronics, give electronics by portion of energy, is allowed to depart from nuclear constraint and escapes from atom, and photon
The direction of motion changes, and energy is reduced.From figure 5 it can be seen that there occurs the total energy of this part signal that Compton scattering is produced
In the range of 27～55, this partial pulse signal is not the signal that we need to value, therefore can be by this partial pulse
Signal is directly abandoned.
Photopeak represents gamma-rays and gets to what generation photoelectric effect (Photoelectric Effect) on detector was produced
The signal of telecommunication.The photoelectric effect refers to γ photons and atomic shell electron interaction, all gives electronics energy, is allowed to into
For the process of free electron.γ photons disappear after losing whole energy, and the vacancy caused after shell electron effusion can cause glimmering
Light radiation, and electronics is by dissipating in the effect that the kinetic energy that photoelectric effect is obtained is ambient substance rapidly.What photoelectric effect was produced
This partial pulse signal is the signal required for us, from figure 5 it can be seen that the total energy value of this partial pulse signal is 55
In the range of～95.But we are not aware that and believe with the presence or absence of pileup pulse in this partial pulse signal that we need
Number, cannot be differentiated with the mode of energy threshold merely, therefore the present embodiment is processed to this part signal emphatically, will
The pileup pulse signal identification of " hiding " in the normal scope of total energy value out, wherein, the normal model of the total energy value
Enclose as the Second Threshold scope.
And this part signal of total energy value higher than 95 is believed beyond the energy range of normal signal, therefore this partial pulse
Number accumulation is likely occurred, as this partial pulse signal is differentiated very well, therefore can be in the way of energy threshold by this portion
Divide pileup pulse signal identification out, i.e. pulse signal of the total energy value higher than 95 is identified as pileup pulse signal, this part
Pileup pulse signal directly can also be abandoned.
Step S204：The pulse signal is divided into into two sections.
Wherein, first paragraph pulse signal is that the arteries and veins for continuously dropping to peak value is produced to first voltage from the pulse signal
Rush signal, the peak value in the first preset range, second segment pulse signal be the pulse signal in remove first pulse
The outer remaining pulse signal of signal.
Step S205：Calculate corresponding first energy value of the first paragraph pulse signal and the second segment pulse signal pair
The second energy value answered.
Step S206：Energy ratio is calculated, the energy ratio is the ratio of first energy value and second energy value.
Step S207：The energy ratio is judged whether in the range of first threshold, if it is, carrying out step S208.
By taking Fig. 6 as an example, the figure is than (will be seen that from embodiment of the method one according to pulse signal total energy value with integration
Arrive, the integration than be the energy ratio a kind of way of realization) scatterplot drawn, the figure and the abscissa of Fig. 5 are to corresponding.
In fig. 6 it can be seen that scatterplot majority of the total energy value in the range of 55～95 is distributed in integration than the model 0.9～3.0
In enclosing, and integrate than the scatterplot less than 0.9 it is considered that there occurs signal pile-up, its concrete reason in embodiment of the method one
Jing illustrates that here is omitted.
Additionally, from fig. 6 it can be seen that scatterplot majority of the total energy value higher than 95 is distributed in integration than the model less than 0.9
In enclosing, this also demonstrates most total amounts and can be worth the pulse signal higher than 95 and there occurs accumulation.
Step S208：The pulse signal is identified as into pileup pulse signal.
Step S209：Determine the pulse pile-up moment, and the pulse signal is carried out according to the pulse pile-up moment
Correction.
The pulse signal is superimposed by N number of pulse signal, and N number of pulse signal is by N number of photomultiplier tube
Export simultaneously, wherein, N >=1.
In the present embodiment, by being corrected to the pulse signal so that according to the energy of the pulse signal
The position of the scintillation crystal that amount information determines is more accurate.Described is to retain to account for the principle that the pulse signal is corrected
The larger pulse signal of whole signal period proportion, gives up the less pulse signal of proportion.
With regard to how to be corrected to the pulse signal according to this principle, referring to Fig. 7, the present embodiment provides as follows
Realize step：
Step S2091：From the beginning of the starting point of the second segment pulse signal, search first voltage and continuously drop to peak
The pulse signal of value, and the time point corresponding to the starting point of the pulse signal that the voltage is continuously dropped to peak value is used as arteries and veins
The moment is piled up in punching.
Wherein, the peak value is in the second preset range.The reason for second preset range is set and arrange described the
The reason for one preset range, is the same, will not be described here, and second preset range can be complete with first preset range
It is identical, it is also possible to different, those skilled in the art can as the case may be depending on.
Under normal circumstances, As time goes on the absolute value of the corresponding voltage of the second segment pulse signal can tend to subtracting
It is little, if occurring in that suddenly the higher voltage peak of an absolute value, it is likely that be exactly second pulse signal and first arteries and veins
Rush signal and accumulation is there occurs on the time point, therefore in the present embodiment, the time point is labeled as into the pulse pile-up moment.
Step S2092：The pulse signal in the pulse pile-up moment as one signal period of bound pair is carried out
Divide, using part of the pulse signal before the pulse pile-up moment with when as first paragraph pulse signal, and will
The part that the pulse signal terminated to the signal period after the pulse pile-up moment is used as second segment pulse signal.
Although within the same time period, the waveform of each pulse signal may be identical, it is also possible to different, its arteries and veins
It is consistent that the moment is piled up in punching.
For example, referring to Fig. 8, the pulse signal of 0-T time section is drawn by the t1 of pulse pile-up moment described in figure
It is divided into two sections, wherein, it is first paragraph pulse signal in 0-t1 of time period, rushes for second segment sectors in 1-T of time period t
Signal.
Step S2093：When the pulse pile-up moment is after the midpoint of the signal period, then according to correction coefficient pair
First paragraph pulse signal is corrected, and abandons the second segment pulse signal.
The pulse pile-up moment means first paragraph pulse signal after the midpoint of the signal period described
In signal period, the persistent period is longer, and second segment pulse signal persistent period in the signal period is shorter.This
The second segment pulse signal is abandoned by embodiment in this case, retains the first paragraph pulse signal, and to institute
State first paragraph pulse signal to be corrected.
Step S2094：When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient pair
The second segment pulse signal is corrected, and abandons the first paragraph pulse signal.
The pulse pile-up moment meaned first paragraph pulse signal before the midpoint of the signal period described
In signal period, the persistent period is shorter, and second segment pulse signal persistent period in the signal period is longer.This
The first paragraph pulse signal is abandoned by embodiment in this case, retains the second segment pulse signal, and to institute
State second segment pulse signal to be corrected.
In the present embodiment, carry out to the first paragraph pulse signal and the second segment point especially by formula (1)
Pulse signal is corrected.
Wherein, the gross energy of the pulse signal is directly proportional to the E (x), and the τ is correction coefficient, and the t is arteries and veins
Punching pile up the moment, the T be the signal period, the xiFor the magnitude of voltage at the i-th moment.
It should be noted that the bearing calibration that the present embodiment is provided does not constitute limitation of the invention, art technology
Personnel can designed, designed according to actual needs.
In the present embodiment, the correction coefficient can be by the product of the pulse pile-up moment corresponding normal burst signal
Energy distribution ratio is divided to be determined.For example, one not there is the normal burst signal piled up in a signal period (example
Such as 800ns) under to be integrated the energy value for calculating be 511Kev, it is assumed that the pulse pile-up moment is 410ns, the pulse signal
It is 260Kev that the energy value for drawing is integrated from 0-410ns, then correction coefficient τ is 511/260=1.97.
It is understood that the principle being corrected to the pulse signal above and method are not constituted to skill of the present invention
The restriction of art scheme, those skilled in the art can designed, designeds according to the actual requirements.
The pileup pulse signal processing method that the present embodiment is provided not only includes how to recognize pileup pulse signal, also to heap
Long-pending pulse signal is corrected so that according to the energy information of the pulse signal after correction to the positioning of scintillation crystal more
For accurate, so as to effectively reduce the bit error rate of system, the quality of image is improve.
A kind of processing method of the pileup pulse signal provided based on above example, the embodiment of the present invention additionally provide one
The processing meanss of kind of pileup pulse signal, below in conjunction with the accompanying drawings describing its operation principle in detail.
Device embodiment one
A kind of structural frames of the processing meanss embodiment one of the pileup pulse signal provided for the present invention referring to Fig. 9, the figure
Figure.
The processing meanss of the pileup pulse signal that the present embodiment is provided include：
Acquiring unit 301, segmenting unit 302, the first computing unit 303, the second computing unit 304, the first judging unit
305 and recognition unit 306；
Wherein, the acquiring unit 301 is connected with the segmenting unit 302, and the segmenting unit 302 and described first is counted
Calculate unit 303 to connect, first computing unit 303 is connected with second computing unit 304, second computing unit
304 are connected with first judging unit 305, and first judging unit 305 is connected with the recognition unit 306；
The acquiring unit 301, for obtaining pulse signal；
The segmenting unit 302, for the pulse signal is divided into two sections, wherein, first paragraph pulse signal is from institute
State pulse signal and produce to first voltage the pulse signal for continuously dropping to peak value, the peak value in the first preset range,
Second segment pulse signal be the pulse signal in addition to first pulse signal remaining pulse signal；
First computing unit 303, for calculating corresponding first energy value of the first paragraph pulse signal and described
Corresponding second energy value of second segment pulse signal；
Second computing unit 304, for calculating energy ratio, the energy ratio is first energy value and described the
The ratio of two energy values；
First judging unit 305, for judging the energy ratio whether in the range of first threshold, if it is,
The recognition unit is activated then；
The recognition unit 306, for the pulse signal is identified as pileup pulse signal.
The pulse signal is divided into two sections by obtaining pulse signal by the present invention, calculates the first paragraph pulse signal
Corresponding first energy value and corresponding second energy value of the second segment pulse signal, and calculate first energy value and institute
The energy ratio of the second energy value is stated, the energy ratio is judged whether in the range of first threshold, if it is, by the pulse
Signal identification is pileup pulse signal, and accordingly, with respect to prior art, the present invention not only can recognize the heap higher than energy threshold
Product pulse signal, may recognize that the pileup pulse signal less than energy threshold, so as to significantly more efficient identification pulse pile-up
Signal, reduces the bit error rate of system, improves the quality of image.
Device embodiment two
A kind of structural frames of the processing meanss embodiment two of the pileup pulse signal provided for the present invention referring to Figure 10, the figure
Figure.
On the basis of device embodiment one, the processing meanss of the pileup pulse signal that the present embodiment is provided also include：Really
Order unit 307 and correction unit 308；
The recognition unit 306 is connected with the determining unit 307, the determining unit 307 and it is described correction unit 308
Connection；
The determining unit 307, for determining the pulse pile-up moment；
The correction unit 308, for being corrected to the pulse signal according to the pulse pile-up moment.
The pulse signal is superimposed by N number of pulse signal, and N number of pulse signal is by N number of photomultiplier tube
Export simultaneously, wherein, N >=1.
In the present embodiment, the determining unit 307, for determining that the pulse pile-up moment includes：
The determining unit 307, the starting point for the second segment pulse signal start, and search first voltage continuous
Drop to the pulse signal of peak value, the peak value is in the second preset range, and the voltage is continuously dropped to the arteries and veins of peak value
The time point corresponding to the starting point of signal is rushed as the pulse pile-up moment.
It is described correction unit 308, for according to the pulse pile-up moment pulse signal is corrected including：
The correction unit 308, for the sectors in the pulse pile-up moment as one signal period of bound pair
Rush signal to be divided, part of the pulse signal before the pulse pile-up moment with when is rushed as first paragraph sectors
Signal, and the part that the pulse signal terminated to the signal period after the pulse pile-up moment is rushed as second segment sectors
Signal；When the pulse pile-up moment is after the midpoint of the signal period, then first paragraph sectors is rushed according to correction coefficient
Signal is corrected；When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient to described
Second segment pulse signal is corrected.
The pileup pulse signal processing apparatus that the present embodiment is provided not only include how to recognize pileup pulse signal, also to heap
Long-pending pulse signal is corrected so that according to the energy information of the pulse signal after correction to the positioning of scintillation crystal more
For accurate, so as to effectively reduce the bit error rate of system, the quality of image is improve.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially for device reality
For applying example, as which is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to embodiment of the method
Part explanation.Device embodiment described above is only schematic, wherein described illustrate as separating component
Unit and module can be or may not be physically separate.Furthermore it is also possible to select which according to the actual needs
In some or all of unit and module realizing the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying
In the case of creative work, you can to understand and implement.
The above is only the specific embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (16)
1. a kind of processing method of pileup pulse signal, it is characterised in that methods described includes：
Obtain pulse signal；
The pulse signal is divided into into two sections, wherein, first paragraph pulse signal be from the pulse signal produce to first it is electric
Pressure continuously drops to the pulse signal of peak value, the peak value in the first paragraph pulse signal in the first preset range, second segment
Pulse signal be the pulse signal in addition to the first paragraph pulse signal remaining pulse signal；
Calculate corresponding first energy value of the first paragraph pulse signal and corresponding second energy of the second segment pulse signal
Value；
Energy ratio is calculated, the energy ratio is the ratio of first energy value and second energy value；
Judge the energy ratio whether in the range of first threshold；
If it is, the pulse signal is identified as pileup pulse signal.
2. the processing method of pileup pulse signal according to claim 1, it is characterised in that by the pileup pulse signal
Abandon.
3. the processing method of pileup pulse signal according to claim 1, it is characterised in that first energy value and institute
State first paragraph pulse signal to be directly proportional the integrated value of time；
Second energy value is directly proportional to the integrated value of time to the second segment pulse signal.
4. the processing method of pileup pulse signal according to claim 1, it is characterised in that first energy value and institute
The summation for stating each sampled voltage in first paragraph pulse signal is directly proportional；
Second energy value is directly proportional to the summation of each sampled voltage in the second segment pulse signal.
5. the processing method of pileup pulse signal according to claim 1, it is characterised in that in the acquisition pulse signal
The step of after, methods described also includes：
Calculate the total energy value of the pulse signal；
Judge the total energy value whether in the range of Second Threshold；
If it is, carrying out described the step of the pulse signal is divided into two sections.
6. the processing method of pileup pulse signal according to claim 5, it is characterised in that when judging the gross energy
Not in the Second Threshold scope, methods described includes value：
The pulse signal is abandoned.
7. the processing method according to the pileup pulse signal of claim 5 or 6, it is characterised in that the total energy value with it is described
Pulse signal is directly proportional to the integration of time.
8. the processing method of pileup pulse signal according to claim 1 or 5, it is characterised in that the pulse signal is by N
Individual pulse signal superposition, N number of pulse signal are exported simultaneously by N number of photomultiplier tube, wherein, N >=1；
Methods described also includes：
Determine the pulse pile-up moment, and the pulse signal is corrected according to the pulse pile-up moment.
9. the processing method of pileup pulse signal according to claim 8, it is characterised in that during the determination pulse pile-up
Quarter includes：
From the beginning of the starting point of the second segment pulse signal, the pulse signal that first voltage continuously drops to peak value is searched,
Peak value in the second segment pulse signal is in the second preset range, and voltage is continuously dropped to the second segment pulse letter
Time point corresponding to the starting point of the pulse signal of the peak value in number is used as the pulse pile-up moment.
10. the processing method of pileup pulse signal according to claim 9, it is characterised in that described according to the pulse
Pile up the moment pulse signal is corrected including：
The pulse signal in the pulse pile-up moment as one signal period of bound pair is divided, by the sectors
Part of the signal before the pulse pile-up moment with when is rushed as first paragraph pulse signal, and the pulse signal is existed
The part terminated to the signal period after the pulse pile-up moment is used as second segment pulse signal；
When the pulse pile-up moment is after the midpoint of the signal period, then the punching of first paragraph sectors is believed according to correction coefficient
Number it is corrected；
When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient to the second segment sectors
Rush signal to be corrected.
The processing method of 11. pileup pulse signals according to claim 10, it is characterised in that described when the pulsed reactor
The product moment after the midpoint of the signal period, is then corrected to first paragraph pulse signal according to correction coefficient；Work as institute
The pulse pile-up moment is stated before the midpoint of the signal period, then the second segment pulse signal is entered according to correction coefficient
Row correction is specially：
Wherein, the gross energy of the pulse signal is directly proportional to E (x), and the τ is correction coefficient, when the t is pulse pile-up
Carve, the T be the signal period, the xiFor the magnitude of voltage at the i-th moment.
The processing method of the 12. pileup pulse signals according to claim 10 or 11, it is characterised in that when the pulsed reactor
The product moment, methods described also included after the midpoint of the time period that the pulse signal is crossed over：Abandon the second segment sectors
Rush signal；
When the pulse pile-up moment is before the midpoint of the time period that the pulse signal is crossed over, methods described also includes：Lose
Abandon the first paragraph pulse signal.
13. a kind of processing meanss of pileup pulse signal, it is characterised in that described device includes：Acquiring unit, segmenting unit,
First computing unit, the second computing unit, the first judging unit and recognition unit；
Wherein, the acquiring unit is connected with the segmenting unit, and the segmenting unit is connected with first computing unit, institute
State the first computing unit to be connected with second computing unit, second computing unit is connected with first judging unit,
First judging unit is connected with the recognition unit；
The acquiring unit, for obtaining pulse signal；
The segmenting unit, for the pulse signal is divided into two sections, wherein, first paragraph pulse signal is to believe from the pulse
Number produce to first voltage and continuously drop to the pulse signal of peak value, the peak value in the first paragraph pulse signal is pre- first
If in scope, second segment pulse signal be the pulse signal in addition to the first paragraph pulse signal remaining pulse signal；
First computing unit, for calculating corresponding first energy value of the first paragraph pulse signal and the second segment arteries and veins
Rush corresponding second energy value of signal；
Second computing unit, for calculating energy ratio, the energy ratio is first energy value and second energy
The ratio of value；
First judging unit, for judging the energy ratio whether in the range of first threshold, if it is, activation is described
Recognition unit；
The recognition unit, for the pulse signal is identified as pileup pulse signal.
The processing meanss of 14. pileup pulse signals according to claim 13, it is characterised in that the pulse signal is by N
Individual pulse signal superposition, N number of pulse signal are exported simultaneously by N number of photomultiplier tube, wherein, N >=1；
Described device also includes：Determining unit and correction unit；
The recognition unit is connected with the determining unit, and the determining unit is connected with the correction unit；
The determining unit, for determining the pulse pile-up moment；
The correction unit, for being corrected to the pulse signal according to the pulse pile-up moment.
The processing meanss of 15. pileup pulse signals according to claim 14, it is characterised in that the determining unit, use
In it is determined that the pulse pile-up moment include：
The determining unit, the starting point for the second segment pulse signal start, and search first voltage and continuously drop to
The pulse signal of peak value, the peak value of the second segment pulse signal is in the second preset range, and voltage is continuously dropped to institute
Time point corresponding to the starting point of the pulse signal for stating the peak value of second segment pulse signal is used as the pulse pile-up moment.
The processing meanss of 16. pileup pulse signals according to claim 15, it is characterised in that the correction unit, use
According to the pulse pile-up moment pulse signal is corrected including：
The correction unit, enters for the pulse signal in the pulse pile-up moment as one signal period of bound pair
Row is divided, using part of the pulse signal before the pulse pile-up moment with when as first paragraph pulse signal, and
The part that the pulse signal was terminated to the signal period after the pulse pile-up moment is used as second segment pulse signal；When
The pulse pile-up moment after the midpoint of the signal period, is then carried out to first paragraph pulse signal according to correction coefficient
Correction；When the pulse pile-up moment is before the midpoint of the signal period, then according to correction coefficient to the second segment point
Pulse signal is corrected.
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| CN105212954B (en) | 2015-11-05 | 2018-03-16 | 苏州瑞派宁科技有限公司 | A kind of pulse pile-up event real-time processing method and system |
| CN106821409B (en) * | 2017-01-22 | 2020-10-13 | 东软医疗***股份有限公司 | Stacking event processing method and device |
| CN107193037B (en) * | 2017-07-10 | 2018-11-09 | 西南科技大学 | A kind of Trace elements online recognition method |
| CN111582023B (en) * | 2020-03-27 | 2024-06-14 | 中国科学院高能物理研究所 | Method, system, equipment and storage medium for determining pulse signal energy value |
| CN112587161B (en) * | 2020-12-09 | 2022-09-30 | 明峰医疗***股份有限公司 | Stacking signal recovery method, PET imaging apparatus, and computer-readable storage medium |
| CN115545064B (en) * | 2021-12-09 | 2023-05-23 | 西安中核核仪器股份有限公司 | Pulse signal accumulation identification method |
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