CN106405619A - Detector collimation method and device - Google Patents
Detector collimation method and device Download PDFInfo
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- 230000001413 cellular effect Effects 0.000 claims description 107
- 238000010276 construction Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 230000003834 intracellular effect Effects 0.000 claims description 5
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- 238000005457 optimization Methods 0.000 claims description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005415 bioluminescence Methods 0.000 description 1
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Abstract
Provided is a detector collimation method. The method includes that a detection surface consists of a plurality of detection hole type cells to cover the area passed by the photon emitted in a lighting event; a photosensitive member is attached to the inner wall of each hole type cell, and the photosensitive member can provide photon hitting time and the photographic position; by means of the simulation or actual measurement, the likelihood function of each hole-type cell for the light incident is calculated; and by maximizing the combined position sensitive likelihood functions of all detectors, the incident direction of a particle beam is estimated. Provided is a detector collimation device including a hole-type cell combined module, a hole-type cell inner wall structure module, a hole-type cell photoelectric module, a cell information and calculation module, and a direction estimation module. The detector collimation method and device can effectively improve the detection efficiency of the detector, enlarge the detection visual field, and are particularly suitable for photoelectric detectors with insufficient light intensity and other particle detectors with low particle counting rate.
Description
Technical field
The present invention relates to Digital Signal Processing, Photoelectric Signal Processing and nuclear detection field, more particularly, to a kind of alignment method of the detector of Single Photon Time Resolved Spectrometer and device.
Background technology
The collimation of detector is the most basic always in optical field and of paramount importance aspect, and its importance is embodied in detector and obtains the importances such as the heading of detected thing, position.Because heading and position are detected thing or detected particle（Including fermion and boson）Base attribute, so the collimation of detector or alignment function are highly important for detector.
Existing detector collimation technique mainly includes single hole collimation technique and collimated technology.
Single hole collimation technique is the collimation technique occurring in " pinhole imaging system " story, and its collimation principle is that the light through barrier with holes all have passed through hole（Geometrically it is reduced to a point）, according to light in uniform dielectric the feature along straightline propagation, place a developer sheet or curtain after barrier, you can luminous object to be measured is imaged, completes to the collimation injecting light.
Collimated technology is different from single hole collimation technique, is to inject light using transparent medium distortion the light of transmitting and light shafts are collimated, has an advantage in that the light three-dimensional angle of acquisition is bigger, thus detection efficient is higher.
Both the above collimating fashion be generally operational in light intensity enough in the case of, and for the extremely rare situation of number of photons, due to the restriction of detection efficient, it appears do not have availability.Light in some bioluminescence, Cherenkov and partly flickering lights etc. in mechanism, within 2,000, detection efficient becomes and selects particularly important factor in detection mode the transmitting number of photons of single event.
Therefore, for above-mentioned technical problem it is necessary to for limited number of photons, provide a kind of alignment method of new detector and device, to overcome drawbacks described above, capture the angle of Weak-luminescence event comprehensively（2-D）, the time (1-D), position (3-D), momentum (3-D) totally 9 dimension information.
Content of the invention
In view of this, it is an object of the invention to provide a kind of alignment method of detector and device, the method and device can read the signal of telecommunication sample of multiple photons of a burn event effectively, by improving collimating fashion, reduce or alleviate the less impact that detection or imaging are brought of total number of photons.
For achieving the above object, the present invention provides following technical scheme：
A kind of alignment method of detector, it includes step：
S1：By multiple detection cellular type cellular composition test surfaces, cover the region that burn event sends photon process；`
S2：Enclose photo-sensitive cell in the inwall of each cellular type cellular, photo-sensitive cell is provided that impact time and the photosensitive sites of photon；
S3：By emulating or surveying, calculate the likelihood function that each cellular type cellular injects angle to light；
S4：By maximize all detectors the quick likelihood function of joint bit, estimation particle bundle inject direction.
Preferably, in the alignment method of above-mentioned detector, described burn event refers to the physical phenomenon that there are photon or other particle emission.
Preferably, in the alignment method of above-mentioned detector, described monochromatic light subevent is the event that single photon hits photoelectric device and is detected.
Preferably, in the alignment method of above-mentioned detector, described time window condition selection refers to multiple single photons（No less than 9）Event is in very short time window（Such as 90 ns）Occur, that is, think that the plurality of monochromatic light subevent belongs to a burn event.
Preferably, in the alignment method of above-mentioned detector, in the relative position of cellular type unit intracellular, described photon refers to that relative position in the hole photo-sensitive cell for the photon, this relative position and ray incident angle have direct relation.
Preferably, in the alignment method of above-mentioned detector, the position that described burn event occurs refers to the centre of luminescence of burn event.For directional light element, luminous position is considered infinite point.Thus it is believed that above-mentioned alignment method can be used to detect directional light.
Preferably, in the alignment method of above-mentioned detector, the photographic hole of described detector refers to the poroid geometry being built on detector base, and what this some holes was used for determining photon beam injects direction.
A kind of collimator apparatuses of detector, including cellular type cellular composite module, cellular type cellular interior wall construction module, cellular type cellular optical-electric module, cellular information and computing module and direction estimation module.
Cellular type cellular composite module, for combining each cellular type cellular, making cellular type cellular be combined into rational test surface, towards light source simultaneously according to the heading of photon, carries out the optimization in frame for movement.
Cellular type cellular interior wall construction module, the support for photo-sensitive cell in each cellular type cellular and fixation.The photo-sensitive cell of each cellular type unit intracellular can be the same or different, and the even-order norm of the derivative according to maximization likelihood function for the concrete setting is the selected criteria of parameter.
Cellular type cellular optical-electric module, for photon or other particles of flying into are converted into the signal of telecommunication, the usually photoelectric device of speed.
Cellular information and computing module, for extracting time location information interested from the sample of the signal of telecommunication.
Direction estimation module, for estimating to inject the direction of light beam.
From technique scheme as can be seen that passing through alignment method and the device of the detector using the present invention, the detection efficient of device can be effectively improved, be particularly suitable for the detection to low light level light beam.
Compared with prior art, the invention has the beneficial effects as follows：
（1）Higher detection efficient：Due to not applying extra medium during photon acceptor in this programme, hence without the photonic losses of collimated；
（2）The detector design of the full 3D of various visual angles：Single pass can obtain the monochromatic light sub-information at super large visual angle simultaneously, thus can obtain and collimate bigger detection effective area than single hole；
（3）Overlength focuses on and super-layer visual field：Due to porous and the multidirectional detection geometry of in the hole, the focal length of overlength is had based on the design of this kind of cellular type cellular and super large detects the visual field.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing of required use in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing for the present invention in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the flow chart of the alignment method of detector of the present invention.
Fig. 2 is the structure drawing of device of the collimator apparatuses of detector of the present invention.
Fig. 3 is the detector module being made up of cellular type cellular of the present invention.
The detection system that Fig. 4 is made up of cellular type cellular detector module for the present invention.
Fig. 5 is the schematic diagram that the present invention multiple cellular type cellular time window selects event.
Fig. 6 is the spatial resolution of the collimator apparatuses of the typical detector of the present invention.
Fig. 7 is the reconstructed results of 30 burn event of collimator apparatuses of the typical detector of the present invention.
Fig. 8 is that the point-like of the present invention tests prosthese.
Fig. 9 is that the wire of the present invention tests prosthese（Horizontally-arranged）.
Figure 10 is the wire test prosthese of invention（Tandem）.
Specific embodiment
The invention discloses a kind of alignment method of the detector of Single Photon Time Resolved Spectrometer and device, the method and device can increase visual field, the detection efficient of lifting detector effectively.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is described in detail it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into the scope of protection of the invention.
As shown in figure 1, the alignment method of detector disclosed by the invention and device pass through to gather single photon signal with cellular type cellular, the selection of time window condition and estimation theory is recycled to screen out the angle of luminous beam, specific method and step is：
S1：By multiple detection cellular type cellular composition test surfaces, cover the region that burn event sends photon process；`
S2：Enclose photo-sensitive cell in the inwall of each cellular type cellular, photo-sensitive cell is provided that impact time and the photosensitive sites of photon；
S3：By emulating or surveying, calculate the likelihood function that each cellular type cellular injects angle to light;
S4：By maximize all detectors the quick likelihood function of joint bit, estimation particle bundle inject direction.
In the alignment method of above detector, described burn event refers to that single radiosiotope atomic nucleus transmitting charged particle occurs Cerenkov effect in media as well.
In the alignment method of above detector, described burn event refers to the physical phenomenon that there are photon or other particle emission.
In the alignment method of above detector, described monochromatic light subevent is the event that single photon hits photoelectric device and is detected.
In the alignment method of above detector, described time window condition selection refers to multiple single photons（No less than 9）Event is in very short time window（Such as 90 ns）Occur, that is, think that the plurality of monochromatic light subevent belongs to a burn event.
In the alignment method of above detector, in the relative position of cellular type unit intracellular, described photon refers to that relative position in the hole photo-sensitive cell for the photon, this relative position and ray incident angle have direct relation.
In the alignment method of above detector, the position that described burn event occurs refers to the centre of luminescence of burn event.For directional light element, luminous position is considered infinite point.Thus it is believed that above-mentioned alignment method can be used to detect directional light.
In the alignment method of above detector, the photographic hole of described detector refers to the poroid geometry being built on detector base, and what this some holes was used for determining photon beam injects direction.
As shown in Fig. 2 the collimator apparatuses of detector disclosed by the invention, including cellular type cellular composite module 100, cellular type cellular interior wall construction module 200, cellular type cellular optical-electric module 300, cellular information and computing module 400 and direction estimation module 500, specially：
Cellular type cellular composite module 100, for combining each cellular type cellular, making cellular type cellular be combined into rational test surface, towards light source simultaneously according to the heading of photon, carries out the optimization in frame for movement；
Cellular type cellular interior wall construction module 200, the support for photo-sensitive cell in each cellular type cellular and fixation.The photo-sensitive cell of each cellular type unit intracellular can be the same or different, and the even-order norm of the derivative according to maximization likelihood function for the concrete setting is the selected criteria of parameter；
Cellular type cellular optical-electric module 300, for photon or other particles of flying into are converted into the signal of telecommunication, the usually photoelectric device of speed；
Cellular information and computing module 400, for extracting time location information interested from the sample of the signal of telecommunication；
Direction estimation module 500, for estimating to inject the direction of light beam.
As shown in Fig. 3, Fig. 4 and Figure 10, Fig. 3 is the detector module being made up of cellular type cellular of the present invention, the detection system that Fig. 4 is made up of cellular type cellular detector module for the present invention, Fig. 5 is the schematic diagram that the present invention multiple cellular type cellular time window selects event, Fig. 6 is the spatial resolution of the collimator apparatuses of the typical detector of the present invention, Fig. 7 is the reconstructed results of 30 burn event of collimator apparatuses of the typical detector of the present invention, Fig. 8 is that the point-like of the present invention tests prosthese, and Fig. 9 is that the wire of the present invention tests prosthese（Horizontally-arranged）, Figure 10 is the wire test prosthese of invention（Tandem）.In conjunction with Fig. 3, Fig. 4 and Fig. 5, by several specific embodiments, the alignment method and device of detector of the present invention is described further.The alignment method of detector proposed by the present invention and device, the parameter that it is related to, the selection of time window condition process the feature needing basis with obtaining data and are adjusted to reach good Cerenkov radiation resolution performance and shorter pulse duration.List the parameter of involved Application Example processing data herein.
Example 1：
List the parameter of the present embodiment processing data herein：
Step（1）Actual device used is using camera bellows a size of 1.45m × 1.45m × 1.45m.Penetrate the positron annihilation gammaphoton 18F-FDG that source is 511kev；
Step（2）Using the enhanced silicon photomultiplier of HONGGUANG, detector adopts circulus；
Step（3）Meeting the time is about 9ns, meets and judges to process using the time window condition selection of off-line type；
Step（4）Using the photon beam method for reconstructing of parsing, directly draw time and the direction of light beam.
Example 2：
List the parameter of this application example 2 processing data herein：
Step（1）Actual device used is using camera bellows a size of 1.8m × 1.8m × 1.8m.Light source is the faint light source of living body fluorescent albumen, and burn event per second is 500 times, lights every time and produces 900 photons；
Step（2）Using the enhanced photomultiplier tube of HONGGUANG, detector adopts slab construction；
Step（3）Meeting the time is about 9ns, meets and judges to process using the time window condition selection of off-line type；
Step（4）Using the photon beam method for reconstructing of iteration, draw before time of light beam and direction iteration 50 times.
Methods and apparatus of the present invention can be used for the collimator design in biomedical imaging, can be used for the key areas such as industrial detection, national defence, the energy simultaneously.
In the alignment method of detector that the present invention provides.Selected by time window condition, reject self-luminous and the bias light of organism.The time of burn event is judged and injects angle, higher than the detection efficient of the single hole collimation in background technology and collimated, field range is wide in the relative position of in the hole by monochromatic light subevent.
By the collimator apparatuses of the detector using the present invention, the imaging signal to noise ratio of device can be effectively improved, resist biological tissue's self-luminous impact, be particularly suitable for the less demanding living imaging of the imaging depths such as toy.
Compared with prior art, the invention has the beneficial effects as follows：
（1）Higher detection efficient：Due to not applying extra medium during photon acceptor in this programme, hence without the photonic losses of collimated；
（2）The detector design of the full 3D of various visual angles：Single pass can obtain the monochromatic light sub-information at super large visual angle simultaneously, thus can obtain and collimate bigger detection effective area than single hole；
（3）Overlength focuses on and super-layer visual field：Due to porous and the multidirectional detection geometry of in the hole, the focal length of overlength is had based on the design of this kind of cellular type cellular and super large detects the visual field.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing from the spirit or essential characteristics of the present invention, the present invention can be realized in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is limited by claims rather than described above, it is intended that all changes in the implication and scope of the equivalency of claim that fall are included in the present invention.Any reference in claim should not be considered as limiting involved claim.
In addition, it should be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity, those skilled in the art should using description as an entirety, the technical scheme in each embodiment can also through appropriately combined, formed it will be appreciated by those skilled in the art that other embodiment.
Claims (6)
1. a kind of alignment method of detector it is characterised in that：Including step：
S1：By multiple detection cellular type cellular composition test surfaces, cover the region that burn event sends photon process；`
S2：Enclose photo-sensitive cell in the inwall of each cellular type cellular, photo-sensitive cell is provided that impact time and the photosensitive sites of photon；
S3：By emulating or surveying, calculate the likelihood function that each cellular type cellular injects angle to light;
S4：By maximize all detectors the quick likelihood function of joint bit, estimation particle bundle inject direction.
2. a kind of detector according to claim 1 alignment method it is characterised in that：By multiple detection cellular type cellular composition test surfaces, cover the region that burn event sends photon process.
3. a kind of detector according to claim 1 alignment method it is characterised in that：Enclose photo-sensitive cell in the inwall of each cellular type cellular, photo-sensitive cell is provided that impact time and the photosensitive sites of photon.
4. detector according to claim 1 alignment method it is characterised in that：By emulating or surveying, calculate the likelihood function that each cellular type cellular injects angle to light.
5. detector according to claim 1 alignment method it is characterised in that：By maximize all detectors the quick likelihood function of joint bit, estimation particle bundle inject direction.
6. a kind of collimator apparatuses of detector, including cellular type cellular composite module, cellular type cellular interior wall construction module, cellular type cellular optical-electric module, cellular information and computing module and direction estimation module, specially：
Cellular type cellular composite module, for combining each cellular type cellular, making cellular type cellular be combined into rational test surface, towards light source simultaneously according to the heading of photon, carries out the optimization in frame for movement；
Cellular type cellular interior wall construction module, the support for photo-sensitive cell in each cellular type cellular and fixation；
The photo-sensitive cell of each cellular type unit intracellular can be the same or different, and the even-order norm of the derivative according to maximization likelihood function for the concrete setting is the selected criteria of parameter；
Cellular type cellular optical-electric module, for photon or other particles of flying into are converted into the signal of telecommunication, the usually photoelectric device of speed；
Cellular information and computing module, for extracting time location information interested from the sample of the signal of telecommunication；
Direction estimation module, for estimating to inject the direction of light beam.
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Cited By (2)
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| ES2757984A1 (en) * | 2018-10-31 | 2020-04-30 | Univ Valencia Politecnica | DEVICE FOR THE DETECTION OF GAMMA LIGHTNING WITH ACTIVE SPLITTERS (Machine-translation by Google Translate, not legally binding) |
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