CN102288980B - Light guide and PET (Photomultiplier Tube) detection system applying same - Google Patents
Light guide and PET (Photomultiplier Tube) detection system applying same Download PDFInfo
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- CN102288980B CN102288980B CN201110121817.0A CN201110121817A CN102288980B CN 102288980 B CN102288980 B CN 102288980B CN 201110121817 A CN201110121817 A CN 201110121817A CN 102288980 B CN102288980 B CN 102288980B
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Abstract
The invention provides a light guide and a PET (Photomultiplier Tube) detection system applying the same. The light guide is used for being assembled between a scintillation crystal array and a photoelectric device array of the PET detection system so as to be coupled with the scintillation crystal array and the photoelectric device array; the light guide is provided with a scintillation crystal array coupling surface and a photoelectric device array coupling surface, wherein round grooves which are regularly arranged are formed on the photoelectric device array coupling surface; and each round groove is used for assembling one photoelectric device in the photoelectric device array. With a mechanical structure, the PET detection system disclosed by the invention can ensure that all crystals of the scintillation crystal array are positioned on one plane, all photoelectric devices are positioned on one plane, and a scintillation crystal array plane is parallel to a plane of the photoelectric device array. Meanwhile, a reflective film is additionally arranged at the proper position of the light guide so as to reduce energy loss and improve the energy detection efficiency of the system.
Description
Technical field
The present invention relates to positron emission tomoscan (PET, positron emission tomography) technical field, more specifically, the PET detection system that relates to a kind of photoconduction and apply this photoconduction.
Background technology
In recent years, in Medical Physics field, the application of PET detector is more and more extensive.In PET application, require the energy to a pair of gamma ray producing after positron annihilation, and the position of hitting detector measures accurately, to determine radioactive nucleus position and to quantize the physiological processes of human body.
Current topmost PET panel detector structure is that scintillation crystal array adds by photomultiplier (Photomultiplier tube, PMT) the electrooptical device array forming, ray sends fluorescence after hitting scintillation crystal array, by electrooptical device array, absorbed after amplification, obtain electric signal.From PET panel detector structure angle, the flatness of scintillation crystal array and the coupling of electrooptical device array is better, it is more that the luminous energy sending from scintillation crystal array is caught by electrooptical device array, and the efficiency of the detection of PET detector is higher, and measuring error is also less.Therefore, the degree of coupling of scintillation crystal array and electrooptical device array is one of key factor affecting PET detection system detection efficiency.
The main design proposal of PET detector has following three kinds at present:
1, adopt circular photomultiplier, and the edge offset of scintillation crystal array and photomultiplier alignment, the scintillation crystal array of such one 8 * 8 needs the different quadrants of four of 4 photomultipliers to cover, and this design proposal is the main flow method for designing of current PET detector.The benefit of this design proposal is the number that can greatly reduce the required photomultiplier of whole system, reduces system cost, and shortcoming is that the part detection area of the photomultiplier not covered by scintillation crystal array on edge will be wasted.
2, adopt square photomultiplier to form electrooptical device array, the same edge offset that mostly adopts of alignment thereof of electrooptical device array and scintillation crystal array is alignd.Because square electrooptical device array can be covered by square scintillation crystal array completely, therefore the benefit of this programme is that theoretical detection efficiency is the highest, but because the processing of square photomultiplier is than the processing difficulties of circular photomultiplier, cause the system cost of this programme very high.
3, adopt the crystalline material of differential declines time to form mixed crystal array.Hybrid mode can be that each single crystal is spliced by different materials, or single crystal is comprised of same material, but whole crystal array is comprised of different materials.The benefit of this scheme is by the careful selection to material, and photoyield (energy) difference while likely making photon hit the diverse location of crystal array is very large, improves the resolution characteristic of PET detection system; But the assembling of mixed crystal array is inconvenient, and because the physical characteristics (such as aging characteristics) of different materials is inconsistent, the time has been grown may be because the reasons such as system aging are brought larger error to result of detection.
Also favourablely in prior art with photoconduction, connect the scheme that scintillation crystal array and PMT array improve the detection efficiency of PET detection system, if publication number is CN1186246A and CN101182133A Chinese patent application, but in the disclosed technical scheme of this open text, photoconduction (device) just utilizes light that the light signal on scintillation crystal array is guided to photomultiplier, to avoid the scattering of signal and the interference of outer signals, although the application of this photoconduction can improve resolution and the sensitivity of PET detector, but its high cost, on the other hand, this two schemes is not all explored the potential location of photoconduction and assembling function, mechanical couplings between scintillation crystal array and electrooptical device array is not had to help.
Summary of the invention
In view of the above problems, the object of this invention is to provide a kind of simple in structure, cheaply can be from the photoconduction of the better coupled scintillation crystal array of mechanical configuration aspects and electrooptical device array.
Based on above-mentioned purpose, the invention provides a kind of photoconduction for PET detection system, this photoconduction is for being assemblied between the scintillation crystal array of PET detection system and electrooptical device array to be coupled between described scintillation crystal array and electrooptical device array, this photoconduction has described scintillation crystal array coupling surface and electrooptical device array coupling surface, wherein
On described electrooptical device array coupling surface, offer the circular groove that rule is arranged, described in each, circular groove is for assembling an electrooptical device of described electrooptical device array.
On the other hand, the present invention also provides a kind of PET detection system, comprise scintillation crystal array, electrooptical device array and be coupling in described scintillation crystal array and electrooptical device array between photoconduction, wherein,
In the one side of described photoconduction and the coupling of described electrooptical device array, offer the circular groove that rule is arranged, described in each, circular groove is for holding an electrooptical device of described electrooptical device array.
Above-mentioned according to photoconduction of the present invention and PET detection system, can guarantee with the physical construction of photoconduction itself all crystals of scintillation crystal array in one plane, guarantee all electrooptical devices in one plane simultaneously, and make the plane parallel of scintillation crystal array plane and electrooptical device array.Without equipment and assembly technologies such as complicated levelling, alignment, photocon just can simple realization scintillation crystal array and the perfect coupling of electrooptical device array cheaply only to use one.
In order to realize above-mentioned and relevant object, one or more aspects of the present invention comprise below by the feature that describes in detail and particularly point out in the claims.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.Yet, the indication of these aspects be only some modes that can use in the variety of way of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Accompanying drawing explanation
By reference to the content below in conjunction with the description of the drawings and claims, and along with understanding more comprehensively of the present invention, other object of the present invention and result will be understood and easy to understand more.In the accompanying drawings:
Fig. 1 is the PET detection system front view of the embodiment of the present invention;
Fig. 2 is the three-view diagram of photoconduction and scintillation crystal array fitting surface in the PET detection system of the embodiment of the present invention;
Fig. 3 is the three-view diagram of photoconduction and electrooptical device array fitting surface in the PET detection system of the embodiment of the present invention;
Fig. 4 A, Fig. 4 B and Fig. 4 C are the reflectance coating of the embodiment of the present invention and the schematic diagram that increases reflectance coating front and back at the photomultiplier fitting surface of photoconduction;
Fig. 5 is the front view of photoconduction in the PET detection system of the embodiment of the present invention;
Fig. 6 expands the assembling design sketch of rear crystal array, photoconduction and photomultiplier tube array to crystal array in the embodiment of the present invention.
In institute's drawings attached, identical label is indicated similar or corresponding feature or function.
Embodiment
Below with reference to accompanying drawing, specific embodiments of the invention are described in detail.
The photoconduction for coupled scintillation crystal array and electrooptical device array providing in the present invention, from the physical characteristics of itself, fully explore potential location and the assembling function of photoconduction, utilize photoconduction can die sinking manufacture thereby geometrical property (homogeneity of flatness, thickness, boring, fluting etc.) hold manageable feature, by photoconduction align crystal array and photomultiplier tube array; Also utilize photoconduction to assemble the crystal row on the limit of expansion crystal array, and the reflectance coating that pastes high reflectance of the assigned address by the photomultiplier fitting surface at photoconduction reach the object of raising system detection efficiency simultaneously.
Because the photoconduction providing in the present invention is the object that could realize with scintillation crystal array and the coupling of electrooptical device array the effect of aliging, reach the detection efficiency that improves PET detection system, therefore, for clearer, technical scheme of the present invention is described, the angle with concrete PET detection system integral body describes technical scheme of the present invention below.
Fig. 1 is the PET detection system front view of the embodiment of the present invention, Fig. 2 and Fig. 3 be photoconduction respectively with the three-view diagram of scintillation crystal array and electrooptical device array fitting surface.
As shown in Figure 1, Figure 2 and Figure 3, PET detection system provided by the invention comprise scintillation crystal array 10, electrooptical device array 30 and be coupling in scintillation crystal array 10 and electrooptical device array 30 between photoconduction 20, wherein, in the one side being coupled at photoconduction 20 and electrooptical device array 30, offer the circular groove 22 that rule is arranged, each circular groove 22 is for assembling an electrooptical device of electrooptical device array 30.Electrooptical device is adhesively fixed on circular groove by glue that specifically can not extinction.
Due to the annular detecting structure of the final PET detector product forming for consisting of a plurality of scintillation crystal arrays, photoconduction and electrooptical device array combination, the central authorities of annular are the object being detected.Therefore the side of photoconduction is inclined-plane as shown in Figure 1, Figure 2 and Figure 3, and the cross section of circular groove sees it is trapezoidal from an angle.In a specific embodiment of the present invention, the angle of inclination of light guide side is 20 degree, and final 18 photoconductions are combined into an annular.
Wherein scintillation crystal array 10 is for detection of gamma rays, can adopt any suitable scintillation crystal according to product demand, for example silicic acid lutetium (LSO), yttrium luetcium silicate (LYSO), bismuth germanium oxide (BGO) or other have the crystal of close photoyield.The surface of scintillation crystal can be uneven surface, can be also polished surface.In addition, in order to keep forming in detection system the luminous consistance of each scintillation crystal module of scintillation crystal array, before carrying out the assembling of detection system, preferably the luminescence yield of scintillation crystal is tested one by one, so that in assembling detection system, the approaching crystal of selective light yield is assembled, thereby guarantees the consistance of the scintillation crystal array all crystals in detection system.
Electrooptical device array 30 is for carrying out opto-electronic conversion and electric signal being amplified, the most normally used is photomultiplier, also can be other semiconductor optoelectronic converting devices, electrooptical device is lined up array, the space projection outer of array should be able to cover the space projection outer of crystal array, to guarantee that the light that scintillation crystal array sends can all be collected by electrooptical device array.
Photoconduction 20 is for above-mentioned scintillation crystal array 10 and the electrooptical device array 30 of being coupled.The photoconduction adopting in the present invention can be any optical material with good light permeability, for example optical glass and optics organic glass.Wherein light guide body plane 21 will participate in the distribution of the light that transmits to electrooptical device array from scintillation crystal array, so the thickness of light guide body plane 21 should be as far as possible thin in the situation that physical strength allows, to reduce loss and the scattering of light.The surface of photoconduction can be uneven surface, can be also polished surface.Photoconduction can die sinking manufacture meets the requirement of specific geometric shape, intensity and precision.Be compared to the photoconduction in prior art with complicated optical fiber structure, this photoconduction of the present invention has greatly reduced the integral production cost of PET detection system.
What in the one side of photoconduction 20 coupling light power conversion device arrays 30, offer is align keys of scintillation crystal array and electrooptical device array of the present invention for holding circular groove 22 that the rule of electrooptical device array arranges, because circular groove 22 is to offer for coupling light power conversion device array 30, therefore, also circular grooves all on photoconduction 20 can be considered as to a circular groove array, distance between adjacent circular groove is accomplished as far as possible little, in a preferred embodiment of the present invention, spacing between adjacent circular groove is controlled to 1mm, the diameter of groove depends on the diameter of photomultiplier.Each groove holds an electrooptical device, the cross-sectional sizes of groove is advisable just to hold an optical transition device, the degree of depth of groove can be set flexibly according to the actual product demand of detector system, can limit the not run-off the straight of electrooptical device held, skew for well.
In order to improve the light energy detection efficiency of detector system, in a preferred embodiment of the present invention, also between circular groove, the surface label of part is covered with the reflectance coating of high reflectance (being more than or equal to 95%), that is to say, the surface label of the part in the one side of photoconduction and electrooptical device array coupling except circular groove is covered with has high reflectance, the reflectance coating of low absorptivity, so that the light projecting in groove walls can not revealed from groove surfaces, and can be reflected film, reflect back and re-start distribution, and the electrooptical device respectively being closed on after multiple reflections absorbs.In application process, if the position of the scintillation crystal that gamma rays hits is in the planimetric area of electrooptical device, so consequent luminous energy can most of be caught and survey by electrooptical device, if the position of the crystal that gamma rays hits is not in the planimetric area of electrooptical device, because these positions are covered by the reflecting material of high reflectance, photon can be reflected back and redistribute, and the electrooptical device respectively being closed on after multiple reflections absorbs, so this part luminous energy can not lose.
Fig. 4 A, Fig. 4 B, Fig. 4 C show the schematic diagram of the increase of the photomultiplier fitting surface at the photoconduction reflectance coating of the embodiment of the present invention, and as shown in Figure 4 A, Fig. 4 B is not for pasting the photoconduction of reflectance coating for the shape of reflectance coating 40, and Fig. 4 C is the photoconduction that has pasted reflectance coating.
The reflectance coating of this high reflectance can adopt any reflecting material in blinking spectral range with high reflectance, low absorptivity, as spectral enhancement type reflectance coating (Enhanced Spectral Reflector, ESR), Teflon (Teflon) film or titanium dioxide powder etc.
Aspect the technological process of production; can after the circular groove that photoconduction is carried out to die sinking machining, formation coupling light power conversion device array, paste again reflectance coating; also can in the one side that need to offer circular groove, paste whole reflectance coating in advance in photoconduction die sinking machinery first being processed; and then carry out die sinking machining; so just do not need to consider the shape of reflectance coating and the problem of aligning; thereby reduce the difficulty of pad pasting, simplification of flowsheet.The pasting technique and also can adopt the mode that applies reflectance coating substitute according to the needs of production technology of reflectance coating, with the problem such as overcome reflectance coating and paste (coating) surperficial shape, align.
The one side of photoconduction and scintillation crystal array coupling can be plane, also can cave in, and in the one side of photoconduction coupled scintillation crystal array, offers for holding the groove of scintillation crystal array.In assembling process, can directly scintillation crystal array be bonded in the plane of photoconduction and scintillation crystal array coupling, or scintillation crystal array be bonded in the groove of photoconduction and scintillation crystal array coupling one side.In addition, in order to prevent light, from the scintillation crystal of outmost turns, reveal, can also be for holding the reflectance coating that pastes high reflectance on the sidewall of groove of scintillation crystal array, equally, this reflectance coating can adopt any reflecting materials in blinking spectral range with high reflectance, low absorptivity such as spectral enhancement type reflectance coating (Enhanced Spectral Reflector, ESR), Teflon (Teflon) film or titanium dioxide powder.
In addition, in a specific embodiment of the present invention, also at the two ends of photoconduction 20, offer for fixing photoconduction, be convenient to the fixed orifice of the assembling of PET system, in the embodiment shown in Fig. 2, Fig. 3 and Fig. 4 B, Fig. 4 C, all show this fixed orifice.
Fig. 5 is the front view of photoconduction in the PET detection system of the embodiment of the present invention.In the embodiment shown in fig. 5, photoconduction 20 offers square groove 23 with the one side of scintillation crystal array coupling, for holding scintillation crystal array; In the one side with electrooptical device array, offer for holding the circular groove 22 of electrooptical device.In addition, in order to adapt to the assembling of the scintillation crystal unit of some expansion, in the embodiment shown in Fig. 5, at the scintillation crystal array fitting surface of photoconduction 20, also in the periphery of square groove 23, offer expansion slot 24, be used for the crystal of assembling expansion to increase the useful detection area of detector.This expansion slot can be offered single or arrange more according to the design of product, need of production.
Fig. 6 expands the assembling design sketch of rear crystal array, photoconduction and photomultiplier tube array to crystal array in the embodiment of the present invention.As shown in Figure 6, scintillation crystal array 10 is after 11 expansions of expansion crystal, just increased the useful detection area of original scintillation crystal array, the one side of photoconduction 20 coupled scintillation crystal arrays also offers expansion slot 24 in square groove 23 peripheries, to hold expansion crystal 11, electrooptical device array 30 is assemblied in the circular groove of photoconduction 20 belows, by photoconduction 20 and scintillation crystal array 10 couplings.
Adopt the PET detector of this light guide provided by the invention, by the machining of die sinking, the all crystals that guarantees scintillation crystal array with the physical construction of photoconduction itself in one plane, guarantee all electrooptical devices in one plane simultaneously, and make the plane parallel of scintillation crystal array plane and electrooptical device array.Like this, without equipment and assembly technologies such as complicated levelling, alignment, photocon just can simple realization scintillation crystal array and the perfect coupling of electrooptical device array cheaply only to use one.
Above with reference to accompanying drawing, in the mode of example, describe according to PET detection system of the present invention.But, it will be appreciated by those skilled in the art that the PET detection system proposing for the invention described above, can also on the basis that does not depart from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (10)
1. the photoconduction for PET detection system, this photoconduction is for being assemblied between the scintillation crystal array of PET detection system and electrooptical device array with described scintillation crystal array and the electrooptical device array of being coupled, this photoconduction has described scintillation crystal array coupling surface and electrooptical device array coupling surface, it is characterized in that:
On the scintillation crystal array coupling surface of described photoconduction, offer square groove, described square groove is used for holding described scintillation crystal array;
Periphery at described square groove offers expansion slot, and described expansion slot is for assembling the scintillation crystal of expansion;
On the described electrooptical device array coupling surface of described photoconduction, offer the circular groove that rule is arranged, described in each, circular groove is for assembling an electrooptical device of described electrooptical device array; Wherein,
The cross section of described circular groove is trapezoidal;
Described electrooptical device is adhesively fixed on described circular groove by glue that can not extinction; And,
The space projection outer of described electrooptical device array covers the space projection outer of described scintillation crystal array.
2. photoconduction as claimed in claim 1, is characterized in that,
The surface label except described circular groove in the electrooptical device array coupling surface of described photoconduction is covered with reflectivity and is more than or equal to 95% reflectance coating.
3. photoconduction as claimed in claim 1, is characterized in that,
On the described scintillation crystal array coupling surface of described photoconduction, offer for holding the groove of described scintillation crystal array.
4. photoconduction as claimed in claim 3, wherein,
At described photoconduction, for holding on the madial wall of groove of scintillation crystal array, be covered with reflectance coating.
5. the photoconduction as described in claim 2 or 4, wherein,
Described reflectance coating is the reflectance coating that spectral enhancement type reflectance coating, Teflon film or titanium dioxide powder form.
6. photoconduction as claimed in claim 1, wherein,
Described photoconduction adopts optics organic glass or optics unorganic glass to make.
7. a PET detection system, comprise scintillation crystal array, electrooptical device array and be coupling in described scintillation crystal array and electrooptical device array between photoconduction, wherein,
In the one side of described photoconduction and the coupling of described scintillation crystal array, offer square groove, described square groove is used for holding described scintillation crystal array;
Periphery at described square groove offers expansion slot, and described expansion slot is for assembling the scintillation crystal of expansion;
In the one side of described photoconduction and the coupling of described electrooptical device array, offer the circular groove that rule is arranged, described in each, circular groove is for assembling an electrooptical device of described electrooptical device array; And,
The cross section of described circular groove is trapezoidal;
Described electrooptical device is adhesively fixed on described circular groove by glue that can not extinction; And,
The space projection outer of described electrooptical device array covers the space projection outer of described scintillation crystal array.
8. PET detection system as claimed in claim 7, wherein,
Surface label in described photoconduction and one side electrooptical device array coupling except described circular groove is covered with reflectivity and is more than or equal to 95% reflectance coating, and described reflectance coating is the reflectance coating that spectral enhancement type reflectance coating, Teflon film or titanium dioxide powder form.
9. PET detection system as claimed in claim 7, wherein,
In the one side of described photoconduction and the coupling of described scintillation crystal array, offer for holding the groove of described scintillation crystal array.
10. PET detection system as claimed in claim 7, wherein,
Described, for holding on the madial wall of groove of scintillation crystal array, be covered with reflectance coating, described reflectance coating is the reflectance coating that spectral enhancement type reflectance coating, Teflon film or titanium dioxide powder form.
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| CN201110121817.0A CN102288980B (en) | 2011-05-12 | 2011-05-12 | Light guide and PET (Photomultiplier Tube) detection system applying same |
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| CN201110121817.0A CN102288980B (en) | 2011-05-12 | 2011-05-12 | Light guide and PET (Photomultiplier Tube) detection system applying same |
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| CN102288981B (en) * | 2011-05-12 | 2013-06-26 | 刘继国 | Positioning assembly system and positioning assembly method of positron emission tomography (PET) detection system |
| CN104199079B (en) * | 2014-07-17 | 2016-11-09 | 许剑锋 | Launch the fixing device of the scintillation crystal of imaging device and detect equipment and method |
| CN105277965B (en) * | 2015-09-30 | 2017-12-12 | 华中科技大学 | A kind of detector for being used to launch imaging device |
| CN105204058B (en) * | 2015-10-23 | 2018-05-25 | 苏州晶特晶体科技有限公司 | A kind of high energy ray detector scintillation crystal array device and its production technology |
| US9658344B1 (en) * | 2015-11-04 | 2017-05-23 | Crystal Photonics, Incorporated | Apparatus including scintillation crystal array with different reflector layers and associated methods |
| WO2017120201A1 (en) * | 2016-01-05 | 2017-07-13 | Board Of Regents, The University Of Texas System | Apparatus and methods for optical emission detection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1016881A2 (en) * | 1998-12-28 | 2000-07-05 | Kabushiki Kaisha Toshiba | Radiation detecting apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1016881A2 (en) * | 1998-12-28 | 2000-07-05 | Kabushiki Kaisha Toshiba | Radiation detecting apparatus |
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Effective date of registration: 20160720 Address after: 276000, 100 meters south of Qingshan village, Li Town, Tancheng County, Shandong, Linyi Patentee after: Shandong Ahmed Ying Hua Technology Co. Ltd. Address before: Jiangning District moling streets integrity Avenue in Nanjing city Jiangsu province 211100 No. 899 building 6 room 504 Patentee before: Liu Jiguo |