WO2019090831A1 - Light guide and nuclear detector - Google Patents

Abstract

A light guide (1) and a nuclear detector. The light guide (1) comprises several light guide strips that are sequentially arranged, each of the light guide strips having a large surface of the optical guide strip and a small surface of the optical guide strip which are opposite, the edge lengths of the large surfaces (A1-A4) of the light guide strip and the small surfaces (B1-B6) of the light guide strip being divided into several different levels, the large surfaces of the light guide strips (A1-A4) constituting an upper surface (11), a lower surface (12) being parallel to the upper surface (11), all the small surfaces (B1-B6) of the light guide strip constituting the lower surface (12), the number of large surfaces (A1-A4) of the light guide strip being the same as the number of small surfaces (B1-B6) of the light guide strip, the area of the lower surface (12) being less than the area of the upper surface (11), and a side surface being connected to the upper surface (11) and the lower surface (12). The nuclear detector further comprises a scintillation crystal array (2), an upper surface (11) of the light guide (1) being coupled to a lower surface (22) of the scintillation crystal array (2), a lower surface (12) of the light guide (1) being coupled to a photoelectric conversion device, the number of large surfaces (A1-A4) of a light guide strip being the same as the number of small surfaces (B1-B6) of the light guide strip, the area of the lower surface (12) being less than the area of the upper surface (11), and the edge length of the large surfaces (A1-A4) of the light guide strip being not less than the edge length of a scintillation crystal strip. The light guide and the nuclear detector have a low cost and a low photon loss rate, and a marginal crystal strip can also realize clear resolution.

Description

Light guide and nuclear detector Technical field

The present invention relates to the field of radiation detection and positron emission tomography, and more particularly to a light guide and a nuclear detector.

Background technique

In nuclear detection equipment such as gamma camera, positron emission tomography (PET, Positron Emission Tomography) system, radiation detector and crystal performance detection device, the spatial resolution of nuclear detector is an important factor in the performance of nuclear detection equipment. index. For example, in the PET system, the spatial resolution reflects the spatial recognition ability of the PET system for fine tissue, which is one of the most important indicators in the PET system, and is also one of the important indicators for evaluating the quality of PET images. PET system as the most fundamental evaluation standard of image system is the quality of reconstructed image. High-quality reconstructed image requires good resolution. Spatial resolution has been the focus of optimization in PET system development over the past decade.

In PET systems, the inherent spatial resolution of PET detectors is one of the key factors affecting the spatial resolution of system imaging. The inherent spatial resolution of the PET detector reflects the minimum distance that the PET detector can distinguish between two point sources. For PET detectors based on array crystals, the intrinsic spatial resolution includes 1/2 crystal strip width and decoding resolution factor. Therefore, for PET detectors based on array crystals, the strip width is generally considered to be inherent in PET detectors. The dominant factor in spatial resolution. In the animal PET where the crystal strip is cut more and more fine, in order to further enhance the inherent spatial resolution of the PET detector, the importance of the decoding resolution factor is more obvious. An important influencing factor of the decoding resolution factor is the design of the front-end detector. Therefore, the design of the front-end detector is also important for improving the inherent spatial resolution of the PET detector.

In the prior art, a nuclear detector with a spatial resolution of less than 2.0 mm is generally referred to as a high spatial resolution nuclear detector. In the current high spatial resolution nuclear detector, an important front-end detector design is known. The solution is to directly couple the photomultiplier tube (PMT) with the array crystal strip, or to couple the photomultiplier device after the array crystal strip 1:1 coupling array light guide, and the position readout adopts position sensitive photomultiplier tube (referred to as PSPMT) or multi-anode photoelectric The tube is multiplied to reduce the effect of the coupling mode on the decoding resolution factor. More specifically, the front-end detector design typically has the following design options:

First, the photomultiplier device is directly coupled by a cone-shaped scintillation crystal array, and it is desirable to solve the problem of a decrease in the signal-to-noise ratio of the photon amount generated when a large-area scintillation crystal array is coupled with a photodetector device having a small detection area. The PET system level reduces the gap between PET detectors and achieves higher light output, thereby increasing the energy resolution and time resolution of PET detectors (Jun Zhu, Qingguo Xie, Ming Niu et al. Potential Advantages) Of Tapered Detector in PET, IEEE, in Conference Record of the 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference [C], pp. 3042-3044, 2011).

Second, the scintillation crystal array is coupled by a conventional rectangular parallelepiped crystal strip. The scintillation crystal array is first coupled to a corresponding conical crystal, such as an plexiglass or quartz glass array, and then coupled to a photomultiplier device. This coupling method can solve the problem of missing data acquisition in the cone crystal, improve the sensitivity of the PET system, and improve the quality of the reconstructed image. At the same time, the method is simpler to process the scintillation crystal strip, and is convenient to realize higher precision of processing and cutting, and to get rid of the processing technology and difficulty of the irregular module such as the cone crystal.

However, there are still many shortcomings in the design of the above PET detector. For example, for the first design, when the PET system is integrated, the coupling method will result in missing data acquisition, reduce system sensitivity, and Irregular crystal strips such as scintillation crystal arrays are more difficult to process, which leads to a decrease in yield during the processing of the crystal strips, an increase in the crystal loss rate, and an increase in the cost of the tapered scintillation crystal array. For the second design scheme, based on the rectangular parallelepiped crystal array coupling one-to-one corresponding cone-shaped crystal recoupling photomultiplier tube, the light guide of the tapered crystal is longer, the photon has a high loss rate during transmission, and affects the signal noise of the optical signal. In contrast, the light loss rate of the edge of the tapered crystal array is particularly high, and some edge crystal strips are not even distinguishable.

Therefore, in view of the above technical problems, it is necessary to propose a nuclear detector which is low in cost, low in photon loss rate, and which can also clearly distinguish edge crystal strips to overcome the above drawbacks.

Summary of the invention

The object of the present invention is to provide a nuclear detector, thereby solving the problem that the nuclear detector in the prior art cannot achieve both low cost and high spatial resolution.

In order to solve the above technical problem, the technical solution of the present invention is to provide a light guide and a nuclear detector. The light guide provided by the present invention comprises: a plurality of light guide strips, the light guide strips are sequentially arranged to constitute the light guide, and each of the light guides The strip has opposite sides of the light guide strip and the facet of the light guide strip, and the side length of the large face of the light guide strip is divided into several different grades, and the side length of the facet of the light guide strip is divided into several different grades; the upper surface, all The large surface of the light guiding strip constitutes the upper surface; the lower surface is parallel to the upper surface, and all of the light guiding strip facets constitute the lower surface, and the number of the large surface of the light guiding strip is The number of facets of the light guiding strip is the same, the area of the lower surface is smaller than the area of the upper surface, and the side surface connecting the upper surface and the lower surface.

a side surface of the light guide includes a first side surface extending from a direction of the lower surface facing the upper surface, and a second side surface extending from the upper surface toward the lower surface Extending, the first side and the second side form a chamfer, and the chamfer is an obtuse angle.

The distance between the apex of the chamfer and the upper surface is from 0.1 mm to 2 mm.

Both the upper surface and the lower surface are rectangular, and both the large face of the light guide strip and the facet of the light guide strip are cut into a rectangular shape.

The light guide strip facets of different grade sides and the light guide strip facets of different grade sides are respectively symmetrically arranged along the side length of the light guide strip face and the light guide strip facet.

The upper surface and the lower surface are circular, trapezoidal or elliptical, and the large surface of the light guide strip along the outermost layer of the light guide and the facet of the light guide strip are cut into an irregular shape, and the remaining light guides are The large face and the facet of the light guide strip are cut into a rectangular shape.

An opaque substance is applied between the light guiding strips.

The height of the light guide is between 0.1mm and 13mm.

The invention provides a nuclear detector with a light guide, comprising: a scintillation crystal array comprising a plurality of scintillation crystal strips arranged in sequence and of the same specification, the scintillation crystal array having a scintillation crystal upper surface and a scintillation crystal under a surface; and the light guide, the light guide comprising: a light guide strip, the light guide strips are arranged to form the light guide, each of the light guide strips has opposite light guide strips and light guide strip facets, and the side length of the large face of the light guide strip is divided into several different grades. The side length of the face of the light guide bar is divided into several different levels, the side length of the large face of the light guide bar is not less than the side length of the strip of the glittering crystal; the upper surface, all the large faces of the light guide bar constitute the An upper surface, the upper surface being coupled to the lower surface of the scintillation crystal; a lower surface, the lower surface being parallel to the upper surface, the lower surface being coupled to the photoelectric conversion device, and all of the light guide strip facets forming Depicting a surface, the number of large faces of the light guiding strip is the same as the number of facets of the light guiding strip, the area of the lower surface is smaller than the area of the upper surface; and the side surface connecting the upper surface and the Describe the surface.

The side surface of the light guide includes a first side surface extending from a direction of the lower surface facing the upper surface, and a second side surface extending from the upper surface toward the lower surface, The first side and the second side form a chamfer, and the chamfer is an obtuse angle.

The distance between the apex of the chamfer and the upper surface is from 0.1 mm to 2 mm.

Both the upper surface and the lower surface are rectangular, and both the large face of the light guide strip and the facet of the light guide strip are cut into a rectangular shape.

The light guide strip facets of different grade sides and the light guide strip facets of different grade sides are respectively symmetrically arranged along the side length of the light guide strip face and the light guide strip facet.

The upper surface and the lower surface are circular, trapezoidal or elliptical, and the large surface of the light guide strip along the outermost layer of the light guide and the facet of the light guide strip are cut into an irregular shape, and the remaining light guides are The large face and the facet of the light guide strip are cut into a rectangular shape.

An opaque substance is applied between the light guiding strips.

The height of the light guide is between 0.1mm and 13mm.

The light guide and the nuclear detector provided by the invention improve the tapered light guide, and adopt a wedge-shaped light guide array, which can shorten the length of the light guide to a large extent, reduce the light loss rate, and improve the signal-to-noise ratio of the optical signal. In particular, the light loss rate of the edge of the crystal array is reduced more, and the position spectrum of the edge crystal can be completely partially cleared. When the PET system or the radiation detecting device is integrated, the data acquisition is not lost, and the sensitivity of the system is not reduced. Meanwhile, in the present invention, the width of the partial light guiding strip is larger than the width of the crystal strip, thereby reducing the number of the light guiding strips, and the processing yield rate of the light guiding crystal is also higher, which is advantageous. Reduce the cost of nuclear detectors.

DRAWINGS

Figure 1 is a side elevational view of a light guide in accordance with one embodiment of the present invention;

Figure 2 is a top plan view of the light guide according to Figure 1;

Figure 3 is a schematic bottom view of the light guide according to Figure 1;

Figure 4 is a side elevational view of a nuclear detector in accordance with one embodiment of the present invention;

Figure 5 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention;

Figure 6 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention;

Figure 7 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention;

Figure 8 is a positional spectrum image acquired by a nuclear detector in accordance with one embodiment of the present invention.

Detailed ways

The invention will be further described below in conjunction with specific embodiments. It is to be understood that the following examples are merely illustrative of the invention and are not intended to limit the scope of the invention.

1 is a front view of a light guide 1 according to a preferred embodiment of the present invention, FIG. 2 is a top plan view of the light guide according to FIG. 1, and FIG. 3 is a bottom view of the light guide according to FIG. 3, the light guide 1 provided by the present invention includes an opposite upper surface 11 and an upper surface 12, the upper surface 11 having an area larger than the area of the lower surface 12, and the light guide 1 further including a side surface connecting the upper surface 11 and the lower surface 12. In the embodiment shown in Figures 2 and 3, the upper surface 11 and the lower surface 12 are both square, and the four sides of the upper surface 11 and the lower surface 12 are in one-to-one correspondence, that is, the four sides of the upper surface 11 are respectively Parallel to the four sides corresponding to the lower surface 12; the side surface includes a first side 13 and a second side 14, wherein the first side 13 extends from the four sides of the lower surface 12 in the direction of the upper surface 11, and the second side 14 is from the upper surface 11 The four sides extend in the direction of the lower surface 12, and a chamfer θ is formed between the first surface 13 and the second surface 14 between the two sides of the upper surface 11 and the lower surface 12. More specifically, in the embodiment illustrated in Figure 1, the second side 14 is perpendicular to both the upper surface 11 and the lower surface 12, and θ is an obtuse angle.

Further, the light guide 1 is cut into a plurality of light guide strips, wherein the upper surface of the light guide 1 is cut into a plurality of large faces of the light guide strips along the direction of either side of the upper surface, and the two light guide strips at both ends are large The length is equal to the width of the corresponding flashing crystal strip, and the length of the large surface of the two light guiding strips in the middle is equal to the length of the large surface of the light guiding strip at both ends, and the length of the other large strips along the side of the strip is greater than two The length of the large side of the light guide strip of the end; likewise, the lower surface of the light guide 1 is cut into a plurality of light guide strip facets along the direction of either side of the lower surface, wherein the lengths of the facets of the two light guide strips at both ends are equal to The length of the corresponding large surface of the light guiding strip, the length of the small surface of the two light guiding strips in the middle is smaller than the length of the small surface of the light guiding strip at both ends, and the length of the small surface of the other light guiding strip along the side of the strip is larger than the small surface of the light guiding strip at both ends length.

In the embodiment of Figures 1-3, the light guide 1 is cut into 10 x 10 light guide strips, and the upper surface 11 of the light guide 1 is cut into 10 x 10 rectangular light guide strip faces, wherein along the upper surface 11 The direction of any one of the sides, the length of the two light guide strips A1 at both ends is substantially equal to the width of the single scintillation crystal strip 24 in the corresponding scintillation crystal array 2 (Fig. 4), and the two middle light guide strips A1 The length of the large surface A1 of the light guiding strip at both ends is equal to the length of the large surface A2 of the other light guiding strip along the side of the strip, and the length of the large surface A1 of the light guiding strip at both ends is larger than the length of the large surface A1 of the light guiding strip at both ends, and the light guiding strip in the upper surface 11 cut in this way The length of the large face A3 is equal to the length of the large face A2 of the light guide bar, the width of the large face A3 of the light guide bar is equal to the width of the large face A2 of the light guide bar, and the length direction of the large face A3 of the light guide bar is perpendicular to the length direction of the large face A2 of the light guide bar; The length and width of the large face A4 are equal to the length of the large face A2 or A3 of the light guide bar; likewise, the lower surface 12 of the light guide 1 is cut into 10×10 rectangular light guide strip facets, along the lower surface 12 The direction of one side, the length of the two light guide strip facets B1 at both ends is equal to the corresponding light The length of the large face A1 of the guide bar, the length of the two light guide strip facets B5 in the middle is smaller than the length of the facet B1 of the light guide strips at both ends, and the length of the other light guide strip facets B2 along the edge is larger than the light guide bars at both ends The length of the facet B1, the length of the light guide strip facet B3 in the lower surface 12 cut in this way is equal to the length of the light guide strip facet B2, the width of the light guide strip facet B3 is equal to the width of the light guide strip facet B5, and the light guide bar is small The length direction of the surface B3 is perpendicular to the length direction of the light guide strip facet B2; the length and width of the light guide strip facet B4 are equal to the length of the light guide strip facet B2 or B3; the length of the light guide strip facet B6 is equal to the light guide strip facet B2 Or the length of B4, the width of the light guide strip facet B6 is equal to the length of the light guide strip facet B5.

More specifically, in the specific embodiment of FIGS. 1-3, the length and width of the large surface A1 of the light guiding strip on the upper surface 11 of the light guide 1 are both 1.9 mm, and the length and width of the large faces A2 and A3 of the light guiding strip are respectively 2.9mm, 1.9mm, the length and width of the large surface A4 of the light guide strip are both 2.9mm; the length and width of the small surface B1 of the light guide strip on the lower surface 12 are both 1.9mm, and the length and width of the small surface B2 of the light guide strip are 2.2 respectively. Mm, 1.9mm, the length and width of the light guide strip facet B3 are 2.2mm, 1.5mm, respectively, the length and width of the light guide strip facet B4 are 2.2mm, the length and width of the light guide strip facet B5 are 1.5mm, The length and width of the light guide strip facet B6 are 2.2 mm and 1.5 mm, respectively. Therefore, the size of the corresponding rectangular single-crystal scintillation crystal strip is 1.89 mm × 1.89 mm × 13 mm, the upper surface area of the light guide 1 is 26.5 × 26.5 mm ² , the lower surface area is 21.5 × 21.5 mm ² ; the height of the light guide is 5.5 mm One side of the chamfer θ is perpendicular to the upper surface, and the vertex of the chamfer is 1.5 mm from the upper surface. It should be noted that in order to meet the needs of different imaging qualities, the distance from the apex of the chamfer to the upper surface can be set to any value between 0.1 mm and 2 mm according to different cutting processes.

4 is a schematic side view of the light guide 1 according to FIG. 1 coupled to a corresponding scintillation crystal array 2. As can be seen from FIG. 4, the present invention also provides a nuclear detector using the above light guide, the nuclear detector including a light guide 1 coupled to each other And the scintillation crystal array 2, the scintillation crystal array 2 comprises a plurality of scintillation crystal strips 24, the upper surface 11 of the light guide 1 is coupled to the lower surface 22 of the scintillation crystal array 2, the lower surface 12 of the light guide 1 and the photoelectric conversion device (not shown) And an electronic readout device (not shown) connected, the side 23 of the scintillation crystal array 2 being flush with the side 14 of the light guide, and the upper surface 21 of the scintillation crystal array 2 for receiving the detected photons, such as gamma Photon, neutron, etc., the scintillation crystal array converts the above-mentioned radiation photons into visible light, and the light guide 1 is used to better transmit the above visible light to the photoelectric conversion device, thereby enabling the photoelectric conversion device to more accurately convert the visible light signal into an electrical signal. Perform image reconstruction. It should be understood by those skilled in the art that the photoelectric conversion device and the electronic reading device in the nuclear detector of the present invention can select different configurations or models according to requirements, which are common knowledge in the art and will not be described herein.

Further, in FIG. 4, the scintillation crystal array 2 includes 13×13 scintillation crystal strips 24, each of which has a square cross section, and the size of the single scintillation crystal strip is 1.89 mm×1.89 mm×13 mm. When the light guide 1 is coupled to the scintillation crystal array 2, in the cross-sectional direction along the side length of the light guide 1, the length A1 of the large surface of the light guide strip at both ends is substantially equal to the side length of the single scintillation crystal strip 24, and the light guide strip near the outermost layer The length of the large surface A2 is substantially 1.5 times the side length of the single scintillation crystal strip 24, in other words, the outer surface of the outer light guide strip has the same size as the single scintillation crystal strip, and the second layer of the light guide strip is directly coupled to the large surface. Two scintillation crystal strips and 1/2 third scintillation crystal strips, the third layer of light guide strips directly couples 1/2 third scintillation crystal strips and fourth scintillation crystal strips, and the fourth layer of photoconductive coupling Five scintillation crystal strips and 1/2 sixth scintillation crystal strips, the fifth layer of light guide strips are coupled to 1/2 of the sixth scintillation crystal strips and 1/2 of the seventh scintillation crystal strips, and the light guide is For the symmetrical structure, the large surface of the back five layers of light guide bars is axisymmetric with the front face of the five layers of light guide bars. Therefore, if the width of the scintillation crystal strip is w and the scintillation crystal array comprises 13×13 scintillation crystal strips, the side length of the upper surface of the light guide is (w+1.5w+1.5w+1.5w+w+w+1.5 w+1.5w+1.5w+w)=13w.

It will be understood by those skilled in the art that the upper surface 11 and the lower surface 12 may also be in other shapes. a shape such as a circle, a rectangle, a trapezoid, an ellipse or the like. In this case, the shape of the light guide strip of the outermost layer of the light guide is different from that in the above embodiment, and the cut and shape of the light guide strip of the inner layer of the light guide are the same as those in the above embodiment. The same, no longer repeat here.

According to another embodiment of the present invention, the side surface may also be formed to smoothly extend from the upper surface 11 to the lower surface 12, in which case θ may be 180°; the side surface may also be formed as two or more first side surfaces and second side surfaces. , ..., the nth (n is a natural number) sides are connected to each other, and at this time, there are a total of (n-1) θ.

Figure 5 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention, wherein the same portion of the reference numerals are indicated by the numeral 100, and the scintillation crystal array 102 includes 13 x 13 scintillation crystal strips 124, Figure 5 and The difference of FIG. 4 is that in the light guide 1 shown in FIG. 4, the width of the scintillation crystal strip is w, and the arrangement of the light guide strips of 1.5w and 1.0w width is different, and four layers of 1.0w light guide are shown in FIG. The arrangement of the strips, Figure 5 shows the arrangement of only 1.0 layer of light guide strips. It should be noted that the number of 1.0W width light guide bars is between 0 and 4 layers. The overall size of the scintillation crystal array 102 is 26.5 x 26.5 x 13.3 ^mm3 , and the size of the single scintillation crystal strip is 1.89 x 1.89 x 13 ^mm3 . The area of the upper surface of the light guide 101 is also 26.5×26.5 mm ² , the area of the lower surface is 21.5×21.5 mm ² , and the light guide 101 is totally coupled by 9×9 light guide strips. In this arrangement, the outermost layer The width of the light guide bar is set to 1.5w, and the width along the side length direction is 1.5w+1.5w+1.5w+1.5w+w+1.5w+1.5w+1.5w+1.5w, only 9 ×9 light guide bars can conduct a 13×13 scintillation crystal array to achieve a one-to-one coupling effect.

6 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention, wherein the same portion of the reference numerals are indicated by the addition of a number 200, and the scintillation crystal array 202 includes 16 x 16 scintillation crystal strips 224, a scintillation crystal array. The total size of 202 is 23.5 × 23.5 × 13.3 mm ³ , the size of a single scintillation crystal strip is 1.3 × 1.3 × 10 mm ³ ; the area of the upper surface of the light guide is also 23.5 × 23.5 mm ² , and the area of the lower surface is 19.5 × 19.5 Mm ² , the light guide is a total of 12 × 12 light guide strips. In this arrangement, the light guide comprises 4 layers of 1.0W width light guide strips, and the outermost light guide strips are also set to a width of 1.0w. The width along the length of the side is arranged as w+1.5w+1.5w+1.5w+1.5w+w+w+1.5w+1.5w+1.5w+1.5w+w, and the 12×12 light guide array can be used. Conducting a 16×16 array of scintillation crystals to achieve a one-to-one coupling effect.

Figure 7 is a side elevational view of a nuclear detector in accordance with another embodiment of the present invention, wherein the same portion of the reference numerals are indicated by the numeral 300, and the scintillation crystal array 302 includes 16 x 16 scintillation crystal strips 324, a scintillation crystal array. The total size of 302 is 23.5×23.5×13.3 mm ³ , the size of a single scintillation crystal strip is 1.3×1.3×10 mm ³ ; the area of the upper surface of the light guide is also 23.5×23.5 mm ² , and the area of the lower surface is 19.5×19.5. Mm ² , the light guide is a total of 12 × 12 light guide strips. In this arrangement, the light guide comprises 4 layers of 1.0W width light guide strips, and the outermost light guide strip is set to a width of 1.5w. The width of the side length direction is 1.5w+1.5w+1.5w+1.5w+1.5w+w+1.5w+1.5w+1.5w+1.5w+1.5w, which can be conducted with an 11×11 light guide array. A 16×16 scintillation crystal array achieves a one-to-one coupling effect.

It should be noted that in order to achieve a better imaging effect, each of the scintillation crystal strips in the scintillation crystal array is six-sided polished, and each of the scintillation crystal strips should be coated with an opaque substance such as diffuse reflection barium sulfate powder or A specular reflection film (ESR film) or the like; a diffuse reflection substance such as barium sulfate powder or the like should also be applied between the respective light guiding strips of the light guide. The height of the light guide should be less than the height of the scintillation crystal array. The material of the light guide can be selected from high light transmittance materials such as organic glass and inorganic quartz glass. The overall height of the light guide is preferably between 0.1 mm and 13 mm.

8 is a position spectrum image acquired by a nuclear detector according to an embodiment of the present invention. As can be seen from FIG. 8, the nuclear detector provided by the present invention can obtain a position spectrum of a corresponding 13×13 scintillation crystal strip. Clear images, especially the flickering crystal strips on the edges, are also clearly distinguishable.

The light guide and the nuclear detector provided by the invention improve the tapered light guide, and adopt a wedge-shaped light guide array, which can shorten the length of the light guide to a large extent, reduce the light loss rate, and improve the signal-to-noise ratio of the optical signal. In particular, the light loss rate of the edge of the crystal array is reduced more, and the position spectrum of the edge crystal can be completely partially cleared. When the PET system or the radiation detecting device is integrated, the data acquisition is not lost, and the sensitivity of the system is not reduced. At the same time, in the present invention, the width of the partial light guiding strip is larger than the width of the crystal strip, thereby reducing the number of the light guiding strips, and the processing yield of the light guiding crystal is also higher, which is advantageous for reducing the cost of the nuclear detector.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications may be made to the above-described embodiments of the present invention. That is, the simple and equivalent changes and modifications made in the claims and the contents of the specification of the present invention fall within the scope of the claims of the present invention. What has not been described in detail in the present invention are all conventional technical contents.

Claims (16)

A light guide, characterized in that the light guide comprises: a plurality of light guiding strips, the light guiding strips are sequentially arranged to form the light guide, each of the light guiding strips has opposite light guiding strips and light guiding strip facets, and the side length of the large surface of the light guiding strip is divided into several different Level, the side length of the light guide strip facet is divided into several different levels; The upper surface, all of the large faces of the light guide strips constitute the upper surface; a lower surface, the lower surface is parallel to the upper surface, and all of the light guide strip facets constitute the lower surface, and the number of large faces of the light guide strip is the same as the number of facets of the light guide strip, the lower The area of the surface is smaller than the area of the upper surface; a side surface connecting the upper surface and the lower surface. The light guide of claim 1 wherein the side of the light guide comprises a first side and a second side, the first side extending from the lower surface facing the upper surface, the second A side surface extends from the upper surface toward the lower surface, the first side surface and the second side surface forming a chamfer, the chamfer being an obtuse angle. The light guide of claim 1 wherein the apex of the chamfer is at a distance from the upper surface of from 0.1 mm to 2 mm. The light guide of claim 1 wherein said upper surface and said lower surface are both rectangular, said light guide strip face and said light guide strip facet being each cut into a rectangular shape. The light guide according to claim 4, wherein said light guide strip face of different grade sides and said light guide strip facets of different grade sides are respectively along said light guide strip face and said light guide strip The sides of the facets are symmetrically arranged. The light guide of claim 1 wherein said upper surface and said lower surface are circular, trapezoidal or elliptical, said light guide strip along said outermost layer of said light guide and said light guide The strip faces are cut into irregular shapes, and the remaining large faces of the light guide strips and the facets of the light guide strips are cut into rectangles. The light guide of claim 1 wherein said light guiding strips are coated with an opaque substance. The light guide of claim 1 wherein said light guide has a height between 0.1 mm and 13 mm. A nuclear detector having the light guide of claim 1 wherein the nuclear detector comprises: a scintillation crystal array comprising a plurality of scintillation crystal strips arranged in sequence and of the same specification, the scintillation crystal array having a scintillation crystal upper surface and a scintillation crystal lower surface; The light guide, the light guide comprises: a plurality of light guiding strips, the light guiding strips are arranged to form the light guide, each of the light guiding strips has opposite light guiding strips and light guiding strip facets, and the side length of the large surface of the light guiding strip is divided into several different levels. The side length of the facet of the light guide bar is divided into several different levels, and the side length of the large face of the light guide bar is not less than the side length of the strip of the glittering crystal; The upper surface, all of the large faces of the light guide strips constitute the upper surface, the upper surface being coupled to the lower surface of the scintillation crystal; a lower surface, the lower surface being parallel to the upper surface, the lower surface being coupled to the photoelectric conversion device, all of the light guide strip facets constituting the lower surface, the number of large faces of the light guide strip and the light guide The number of the facets is the same, the area of the lower surface is smaller than the area of the upper surface; a side surface connecting the upper surface and the lower surface. The nuclear detector according to claim 9, wherein a side surface of the light guide includes a first side surface and a second side surface, the first side surface extending from a direction of the lower surface facing the upper surface, The second side extends from the upper surface toward the lower surface, the first side and the second side forming a chamfer, the chamfer being an obtuse angle. The light guide according to claim 9, wherein the apex of the chamfer is at a distance of 0.1 mm to 2 mm from the upper surface. The light guide of claim 9 wherein said upper surface and said lower surface are both rectangular, said light guide strip face and said light guide strip facet being each cut into a rectangular shape. The light guide according to claim 12, wherein said light guide strip face of different grade sides and said light guide strip facets of different grade sides are respectively along said light guide strip face and The sides of the light guide strip facets are symmetrically arranged. The light guide of claim 9 wherein said upper surface and said lower surface are circular, trapezoidal or elliptical, said light guide strip along said outermost layer of said light guide and said light guide The strip faces are cut into irregular shapes, and the remaining large faces of the light guide strips and the facets of the light guide strips are cut into rectangles. The light guide of claim 9 wherein said light guiding strips are coated with an opaque substance. The light guide of claim 9 wherein said light guide has a height between 0.1 mm and 13 mm.

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