CN202119935U - Light guide and PET detection system using same - Google Patents
Light guide and PET detection system using same Download PDFInfo
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- CN202119935U CN202119935U CN2011201494053U CN201120149405U CN202119935U CN 202119935 U CN202119935 U CN 202119935U CN 2011201494053 U CN2011201494053 U CN 2011201494053U CN 201120149405 U CN201120149405 U CN 201120149405U CN 202119935 U CN202119935 U CN 202119935U
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- photoconduction
- array
- scintillation crystal
- electrooptical device
- crystal array
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Abstract
The utility model provides a light guide and a PET detection system using the same, wherein the light guide is assembled between a scintillation crystal array and a photoelectric converting device array of the PET detection system to couple the scintillation crystal array and the photoelectric converting device array, the light guide is provided with a scintillation crystal array coupling surface and a photoelectric converting device array coupling surface, the photoelectric converting device array coupling surface is provided with regularly arranged circular grooves, and each circular groove is used for assembling one photoelectric converting device in the photoelectric converting device array. The PET detection system in the utility model can ensure all crystals of the scintillation crystal array on one plane by using the machinery structure of the light guide itself, simultaneously ensures all photoelectric converting devices on one plane, and enables the scintillation crystal array plane and the photoelectric converting device array plane to be parallel with each other. Simultaneously, a reflective film is added to a proper position of the light guide, thereby reducing energy loss and increasing energy detection efficiency of the system.
Description
Technical field
The utility model relates to positron emission tomoscan (PET, positron emission tomography) technical field, more particularly, and the PET detection system that relates to a kind of photoconduction and use this photoconduction.
Background technology
In recent years, in the Medical Physics field, the application of PET detector more and more widely.In PET uses, require energy, and hit position of detector and measure accurately, to confirm radioactive nucleus position and the physiological processes that quantizes human body to a pair of gamma ray that produces behind the positron annihilation.
Present topmost PET panel detector structure is that scintillation crystal array adds by photomultiplier (Photomultiplier tube; PMT) the electrooptical device array that constitutes; Ray sends fluorescence after hitting scintillation crystal array, after being amplified by the absorption of electrooptical device array, obtains electric signal.From PET panel detector structure angle; The flatness of scintillation crystal array and the coupling of electrooptical device array is good more; The luminous energy that sends from scintillation crystal array by the electrooptical device array catch many more, the efficient of the detection of PET detector is high more, measuring error is also more little.Therefore, the degree of coupling of scintillation crystal array and electrooptical device array is one of key factor that influences PET detection system detection efficiency.
The main design proposal of PET detector has following three kinds at present:
1, adopts circular photomultiplier; And the edge offset of scintillation crystal array and photomultiplier alignment; Such one 8 * 8 scintillation crystal array needs the different quadrants of four of 4 photomultipliers to cover, and this design proposal is the main flow method for designing of present PET detector.The benefit of this design proposal is the number that can significantly reduce the required photomultiplier of total system, reduces system cost, and shortcoming is will not being wasted by the part detection area of the photomultiplier of scintillation crystal array covering of going up on the edge of.
2, adopt square photomultiplier to form the electrooptical device array, the alignment of the same employing mostly of the alignment thereof of electrooptical device array and scintillation crystal array edge offset.Because square electrooptical device array can be covered by square scintillation crystal array fully; Therefore the benefit of this programme is that theoretical detection efficiency is the highest; But because the processing of square photomultiplier causes the system cost of this programme very high than the processing difficulties of circular photomultiplier.
3, adopt the crystalline material of differential declines time to form the mixed crystal array.Hybrid mode can be that each single crystal all is spliced by material different, and perhaps single crystal is made up of same material, but whole crystal array is made up of material different.The benefit of this scheme is through the careful selection to material, and photoyield (energy) difference in the time of might making photon hit the diverse location of crystal array is very big, 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 owing to reasons such as system aging are brought than mistake to result of detection.
The also favourable scheme that improves the detection efficiency of PET detection system with photoconduction connection scintillation crystal array and PMT array in the prior art; Like publication number is CN1186246A and CN101182133A one Chinese patent application; But in the technical scheme that this open text disclosed; Photoconduction (device) just utilizes light that the light signal on the scintillation crystal array is guided to photomultiplier, with scattering and the interference from outside signals of avoiding signal, though the application of this photoconduction can improve the resolution and the sensitivity of PET detector; But its cost is too high; On the other hand, these two kinds of schemes are not all explored potential location of photoconduction and assembling function, and the mechanical couplings between scintillation crystal array and the electrooptical device array is not had help.
The utility model content
In view of the above problems, the purpose of the utility model provide a kind of simple in structure, cheaply can be from the photoconduction of better coupled scintillation crystal array of mechanical structure aspects and electrooptical device array.
Based on above-mentioned purpose; The utility model provides a kind of photoconduction of the PET of being used for detection system; This photoconduction is used to be assemblied between scintillation crystal array and the electrooptical device array of PET detection system to be coupled between said scintillation crystal array and the electrooptical device array; This photoconduction has said scintillation crystal array coupling surface and electrooptical device array coupling surface, wherein
On said electrooptical device array coupling surface, offer the circular groove that rule is arranged, each said circular groove is used for assembling an electrooptical device of said electrooptical device array.
On the other hand, the utility model also provides a kind of PET detection system, comprise scintillation crystal array, electrooptical device array and be coupling in said scintillation crystal array and the electrooptical device array between photoconduction, wherein,
On the one side of said photoconduction and the coupling of said electrooptical device array, offer the circular groove that rule is arranged, each said circular groove is used for holding an electrooptical device of said electrooptical device array.
Above-mentioned photoconduction and PET detection system according to the utility model; The all crystals that can guarantee scintillation crystal array with the physical construction of photoconduction itself in one plane; Guarantee all electrooptical devices simultaneously in one plane, and make the plane parallel of scintillation crystal array plane and electrooptical device array.Need not 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 purpose, one or more aspects of the utility model comprise the characteristic that the back will specify and in claim, particularly point out.Some illustrative aspects that following explanation and accompanying drawing have specified the utility model.Yet, the indication of these aspects only be some modes that can use in the variety of way of principle of the utility model.In addition, the utility model is intended to comprise all these aspects and their equivalent.
Description of drawings
Through with reference to below in conjunction with the explanation of accompanying drawing and the content of claims, and along with the more complete understanding to the utility model, other purpose of the utility model and result will understand more and reach easy to understand.In the accompanying drawings:
Fig. 1 is the PET detection system front view of the utility model embodiment;
Fig. 2 is the three-view diagram of photoconduction and scintillation crystal array fitting surface in the PET detection system of the utility model embodiment;
Fig. 3 is the three-view diagram of photoconduction and electrooptical device array fitting surface in the PET detection system of the utility model embodiment;
Fig. 4 A, Fig. 4 B and Fig. 4 C are reflectance coating and the synoptic diagram before and after the photomultiplier fitting surface increase reflectance coating of photoconduction of the utility model embodiment;
Fig. 5 is the front view of photoconduction in the PET detection system of the utility model embodiment;
Fig. 6 expands the assembling design sketch of crystal array, photoconduction and photomultiplier tube array afterwards to crystal array among the utility model embodiment.
Identical label is indicated similar or corresponding feature or function in institute's drawings attached.
Embodiment
Below will combine accompanying drawing that the specific embodiment of the utility model is described in detail.
The photoconduction that is used for coupled scintillation crystal array and electrooptical device array that is provided in the utility model; Fully explore potential location and the assembling function of photoconduction from the physical characteristics of itself; Utilize the photoconduction can the die sinking manufacturing thereby geometrical property (homogeneity of flatness, thickness, boring, the fluting etc.) characteristics of control easily, with photoconduction align crystal array and photomultiplier tube array; Also utilize simultaneously photoconduction to assemble the crystal row on the limit of expansion crystal array, and reach the purpose of raising system detection efficiency through the reflectance coating that the assigned address at the photomultiplier fitting surface of photoconduction pastes high reflectance.
Because the photoconduction that is provided in the utility model is the purpose that could realize the effect of aliging with scintillation crystal array and the coupling of electrooptical device array, reach the detection efficiency that improves the PET detection system; Therefore; For clearer technical scheme to the utility model describes, describe with the technical scheme of the whole angle of concrete PET detection system below the utility model.
Fig. 1 is the PET detection system front view of the utility model embodiment, Fig. 2 and Fig. 3 be photoconduction respectively with the three-view diagram of scintillation crystal array and electrooptical device array fitting surface.
Like Fig. 1, Fig. 2 and shown in Figure 3; The PET detection system that the utility model provides 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, On the one side that photoconduction 20 and electrooptical device array 30 are coupled, offer the circular groove 22 that rule is arranged, each circular groove 22 is used for assembling an electrooptical device of electrooptical device array 30.Electrooptical device is adhesively fixed on circular groove through specific glue that can not extinction.
Because the annular detecting structure of the final PET detector product that forms for being made up of a plurality of scintillation crystal arrays, photoconduction and electrooptical device array combination, the central authorities of annular are the object of being surveyed.Therefore the side of photoconduction is like Fig. 1, Fig. 2 and inclined-plane shown in Figure 3, and the cross section of circular groove sees it is trapezoidal from an angle.In an embodiment of the utility model, 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 used to detect gamma rays, can adopt any suitable scintillation crystal according to product demand, and 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 a uneven surface, also can be polished surface.In addition; In order to keep forming in the detection system the luminous consistance of each scintillation crystal module of scintillation crystal array; Before the assembling of carrying out detection system, preferably the luminescence yield of scintillation crystal is tested one by one, so that in the assembling detection system; The approaching crystal of selective light yield is assembled, thereby guarantees the consistance of the scintillation crystal array all crystals in the detection system.
It is keys of the utility model alignment scintillation crystal array and electrooptical device array that being used for of on the one side of photoconduction 20 coupling light power conversion device arrays 30, offering held the 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 can circular grooves all on the photoconduction 20 be regarded as a circular groove array, the distance between the adjacent circular groove is accomplished as far as possible little, in a preferred implementation of the utility model; Spacing between the adjacent circular groove is controlled at 1mm, and the diameter of groove depends on the diameter of photomultiplier.Each groove holds an electrooptical device; The cross-sectional sizes of groove is advisable to hold an optical transition device just; The degree of depth of groove can be set according to the actual product demand of detector system flexibly, can limit the not run-off the straight of electrooptical device held, skew for well.
In order to improve the light energy detection efficient of detector system; In a preferred implementation of the utility model; Also the surface of part is covered with the reflectance coating of high reflectance (more than or equal to 95%) between circular groove; That is to say, paste reflectance coating on the surface of the part of one side except circular groove of photoconduction and electrooptical device array coupling, so that the light that projects on the groove walls can not revealed from groove surfaces with high reflectance, low absorptivity; And the film that can be reflected reflects back and distributes again, and absorbs through the electrooptical device that reflection back is repeatedly respectively closed on.In application process; If the position of the scintillation crystal that gamma rays hits is in the vertical projection area of electrooptical device; So consequent luminous energy can most of caught and survey by electrooptical device; If the position of the crystal that gamma rays hits is not in the vertical projection area of electrooptical device, because these positions are covered by the reflecting material of high reflectance, photon can be reflected back and redistribute; And absorb through the electrooptical device that reflection back is repeatedly respectively closed on, so this part luminous energy can not lose.
What Fig. 4 A, Fig. 4 B, Fig. 4 C showed the utility model embodiment increases the synoptic diagram of reflectance coating at the photomultiplier fitting surface of photoconduction, and the shape of reflectance coating 40 is shown in Fig. 4 A, and Fig. 4 B is not for pasting the photoconduction of reflectance coating, and Fig. 4 C is the photoconduction that has pasted reflectance coating.
The reflectance coating of this high reflectance can adopt any reflecting material that in the blinking spectral range, has high reflectance, low absorptivity; As frequency spectrum enhancement mode 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 die sinking machining, formation coupling light power conversion device array, paste reflectance coating again; The one side of also can be before the photoconduction die sinking machining in advance offering circular groove at needs pastes whole reflectance coating, and then carries out die sinking machining, so just need not consider the shape of reflectance coating and the problem of aligning; Thereby reduce the difficulty of pad pasting, simplify technological process.The pasting technology and also can adopt the mode that applies reflectance coating to substitute according to the needs of production technology of reflectance coating is with problem such as overcome reflectance coating and paste (coating) surperficial shape, align.
The one side of photoconduction and scintillation crystal array coupling can be the plane, also can cave in, and promptly offers the groove that is used to hold scintillation crystal array in the one side of photoconduction coupled scintillation crystal array.In assembling process, can directly scintillation crystal array be bonded on the plane of photoconduction and scintillation crystal array coupling, perhaps scintillation crystal array is bonded in the groove of photoconduction and scintillation crystal array coupling one side.In addition; Reveal from the scintillation crystal of outmost turns in order to prevent light; Can also on the sidewall of the groove that is used to hold scintillation crystal array, paste the reflectance coating of high reflectance; Equally, this reflectance coating can adopt frequency spectrum enhancement mode reflectance coating (Enhanced Spectral Reflector, ESR), any reflecting material that in the blinking spectral range, has high reflectance, low absorptivity such as Teflon (Teflon) film or titanium dioxide powder.
In addition, in an embodiment of the utility model, also offer the fixed orifice that is used for fixing photoconduction, is convenient to 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 at the two ends of photoconduction 20.
Fig. 5 is the front view of photoconduction in the PET detection system of the utility model embodiment.In the embodiment shown in fig. 5, photoconduction 20 offers square groove 23 with the one side of scintillation crystal array coupling, is used to hold scintillation crystal array; Offer the circular groove 22 that is used to hold electrooptical device in one side with the electrooptical device array.In addition; Assembling for the scintillation crystal unit that adapts to some expansion; In embodiment shown in Figure 5, also offer expansion slot 24 at the scintillation crystal array fitting surface of photoconduction 20 in the periphery of square groove 23, the crystal that is used for assembling expansion is to increase the useful detection area of detector.This expansion slot can be offered single or many rows according to design, the production needs of product.
Fig. 6 expands the assembling design sketch of crystal array, photoconduction and photomultiplier tube array afterwards to crystal array among the utility model embodiment.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, through photoconduction 20 and scintillation crystal array 10 couplings.
The PET detector of this light guide that employing the utility model provides; Machining through die sinking; The all crystals that guarantees scintillation crystal array with the physical construction of photoconduction itself in one plane; Guarantee all electrooptical devices simultaneously in one plane, and make the plane parallel of scintillation crystal array plane and electrooptical device array.Like this, need not 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.
As above with the mode of example the PET detection system according to the utility model is described with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that the PET detection system that proposes for above-mentioned the utility model, can also on the basis that does not break away from the utility model content, make various improvement.Therefore, the protection domain of the utility model should be confirmed by the content of appending claims.
Claims (10)
1. photoconduction that is used for the PET detection system; This photoconduction is used to be assemblied between scintillation crystal array and the electrooptical device array of PET detection system with said scintillation crystal array and the electrooptical device array of being coupled; This photoconduction has said scintillation crystal array coupling surface and electrooptical device array coupling surface, it is characterized in that:
On said electrooptical device array coupling surface, offer the circular groove that rule is arranged, each said circular groove is used for assembling an electrooptical device of said electrooptical device array.
2. photoconduction as claimed in claim 1 is characterized in that,
The surface except said circular groove in the electrooptical device array coupling surface of said photoconduction is covered with reflectivity more than or equal to 95% reflectance coating.
3. photoconduction as claimed in claim 1 is characterized in that,
On the said scintillation crystal array coupling surface of said photoconduction, offer the groove that is used to hold said scintillation crystal array.
4. photoconduction as claimed in claim 3 is characterized in that,
Be used to hold at said photoconduction on the madial wall of groove of scintillation crystal array and be covered with reflectance coating.
5. like claim 2 or 4 described photoconductions, it is characterized in that,
Said reflectance coating is the reflectance coating that frequency spectrum enhancement mode reflectance coating, Teflon film or titanium dioxide powder are constituted.
6. photoconduction as claimed in claim 1 is characterized in that,
Said photoconduction adopts optics organic glass or optics unorganic glass to process.
7. PET detection system, comprise scintillation crystal array, electrooptical device array and be coupling in said scintillation crystal array and the electrooptical device array between photoconduction, it is characterized in that,
On the one side of said photoconduction and the coupling of said electrooptical device array, offer the circular groove that rule is arranged, each said circular groove is used for assembling an electrooptical device of said electrooptical device array.
8. PET detection system as claimed in claim 7 is characterized in that,
Surface in said photoconduction and one side electrooptical device array coupling except said circular groove is covered with reflectivity more than or equal to 95% reflectance coating, and said reflectance coating is the reflectance coating that frequency spectrum enhancement mode reflectance coating, Teflon film or titanium dioxide powder are constituted.
9. PET detection system as claimed in claim 7 is characterized in that,
On the one side of said photoconduction and the coupling of said scintillation crystal array, offer the groove that is used to hold said scintillation crystal array.
10. as claimed in claim PET detection system is characterized in that,
On the madial wall of the said groove that is used to hold scintillation crystal array, be covered with reflectance coating, said reflectance coating is the reflectance coating that frequency spectrum enhancement mode reflectance coating, Teflon film or titanium dioxide powder are constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201494053U CN202119935U (en) | 2011-05-12 | 2011-05-12 | Light guide and PET detection system using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201494053U CN202119935U (en) | 2011-05-12 | 2011-05-12 | Light guide and PET detection system using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202119935U true CN202119935U (en) | 2012-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201494053U Expired - Lifetime CN202119935U (en) | 2011-05-12 | 2011-05-12 | Light guide and PET detection system using same |
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| Country | Link |
|---|---|
| CN (1) | CN202119935U (en) |
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2011
- 2011-05-12 CN CN2011201494053U patent/CN202119935U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160715 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 |
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| CX01 | Expiry of patent term |
Granted publication date: 20120118 |
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| CX01 | Expiry of patent term |