CN212256945U - Imaging device and collimator thereof - Google Patents

Abstract

The utility model discloses a collimator, which comprises at least two combined units which are arranged up and down, wherein each combined unit comprises a plurality of sheet structures which are arranged side by side and a fixing device used for fixing the sheet structures; gaps are arranged between adjacent sheet structures, the gaps in the same combined unit are parallel and uniformly arranged, and the gaps in the adjacent combined units are arranged in a non-parallel mode, so that a plurality of parallel holes are formed in the overlapped parts of all the gaps in the vertical direction. Compared with the prior art, the utility model provides a processing and the equipment of collimator are convenient, make the processing cost reduce to the machining precision is high, can realize low-cost, the mass production of high accuracy, is favorable to enlarging the application scope of collimator. The utility model also discloses an imaging device of including above-mentioned collimator.

Description

Imaging device and collimator thereof

Technical Field

The utility model relates to a nuclear medicine technical field, more specifically say, relate to a collimator. Furthermore, the utility model discloses still relate to an imaging device including above-mentioned collimator.

Background

With the continuous progress of science and technology, the nuclear medicine field is also rapidly developed, and in the nuclear medicine imaging, radionuclide or its labeled compound is introduced into the body, and the distribution of the radiopharmaceutical in the body is detected and imaged in vitro by using a nuclear medicine imaging instrument, which is also called functional imaging or metabolic imaging, and is difficult to realize by other medical imaging technologies such as X-ray, CT, and the like. The gamma camera is the earliest and most basic nuclear medical imaging device, and the SPECT is the nuclear medical imaging device which is developed on the basis of the gamma camera, can perform three-dimensional imaging and is most widely applied at present.

The collimator is a key component for imaging of a gamma camera or SPECT, is arranged at the forefront of the detector, is provided with a plurality of collimation holes, only allows rays flying along the collimation holes to pass through, prevents gamma rays in an unspecified range and an unspecified direction from entering the detector, and plays a role in positioning and acquiring information. The collimator is divided into a pinhole type, a parallel hole type, a convergent type and a divergent type according to the geometric shape, wherein the parallel hole type collimator has more applications because of the superior comprehensive performance, and a large number of collimating holes are arranged on the collimator to form a collimating hole array.

As shown in fig. 1, in a typical gamma camera based on a scintillation crystal, a radionuclide 02 or a labeled compound drug thereof emits gamma rays, which selectively impinge on a scintillation crystal 03 through the filtering action of a parallel hole type collimator consisting of a plurality of collimating holes 01. The gamma photons are converted into visible light signals by the scintillation crystal 03. The visible light signal is converted into an electric signal which can be identified by a computer through the photomultiplier tube array 04. And finally forming a required image through the processing of the computer processing unit 05.

The collimator is usually made of a metal material with high atomic number and radiation blocking performance, such as lead and tungsten, wherein lead is the most economical choice, lead is the first choice of the collimator of the nuclear medicine gamma camera in the past, tungsten has a density about 1.7 times that of lead, has more excellent radiation absorption performance, is more effective in screening unwanted gamma beams, and is the preferred material with high imaging quality, but the problem of high processing difficulty and high cost limits the application of the collimator in the field of nuclear medicine imaging.

In the conventional machining method of the tungsten collimator in the prior art, as shown in fig. 2, the sizes of the collimating holes 01 are very small, and the depths of the collimating holes 01 are deep, so that the conventional machining method is difficult to achieve high-precision and high-efficiency production in the case of many small hole diameters. The parallel-hole type collimator has a large number of collimating holes, e.g., from several tens to several thousands. Due to the characteristics of tungsten or tungsten alloy materials, it is difficult to machine several collimating holes 01. The processing cost and time are relatively high, which is not beneficial to industrialization.

In summary, how to provide a collimator convenient to process is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a collimator, which can simplify the process of the collimator and improve the processing efficiency of the collimator.

Another object of the present invention is to provide an image forming apparatus including the above collimator.

In order to achieve the above object, the present invention provides the following technical solutions:

a collimator comprises at least two combined units which are arranged up and down, wherein each combined unit comprises a plurality of sheet structures which are arranged side by side and a fixing device for fixing the sheet structures;

gaps are arranged between every two adjacent sheet-shaped structures, the gaps in the same combined unit are parallel and uniformly arranged, and the gaps in the adjacent combined units are arranged in a non-parallel mode, so that a plurality of parallel holes are formed in the overlapped parts of all the gaps in the vertical direction.

Preferably, the parallel holes are square holes, rhombic holes, polygonal holes or circular holes.

Preferably, the sheet structure includes end metal pieces at ends of the arrangement direction thereof and an intermediate metal piece between the end metal pieces;

the end metal sheet is a tungsten sheet, a gold sheet, a platinum sheet, a tungsten alloy sheet, a gold alloy sheet or a platinum alloy sheet; the intermediate metal sheet is a tungsten sheet, a gold sheet, a platinum sheet, a tungsten alloy sheet, a gold alloy sheet or a platinum alloy sheet.

Preferably, both ends of the end metal sheet in the length direction and both ends of the middle metal sheet in the length direction are provided with first positioning holes for being connected with the fixing device, and the end metal sheet is provided with second positioning holes for being connected with adjacent combination units.

Preferably, the fixing device comprises a first positioning pin, a second positioning pin and a locking device, wherein the first positioning pin is used for being matched with the first positioning hole and penetrating through the first positioning hole, the second positioning pin is used for being connected with the adjacent combination unit and matched with the second positioning hole, and the locking device is used for fastening the sheet structure.

Preferably, both ends of the first locating pin are provided with external threads, and the locking device is a first locking nut matched with the external threads.

Preferably, both ends of the middle metal sheet in the length direction are provided with a first side boss facing one side of the thickness direction and a second side boss facing the other side of the thickness direction, both ends of the end metal sheet in the length direction are provided with third side bosses facing the same side of the thickness direction, and the first side boss, the second side boss and the third side boss are the same in height in the combined unit, so that the same uniform gap is formed in the combined unit.

Preferably, the sheet-shaped structure further comprises spacing members arranged between adjacent sheet-shaped structures, the spacing members are arranged at two ends of the sheet-shaped structures in the length direction, and the length of the spacing members is smaller than half of the length of the sheet-shaped structures, so that gaps are formed between the adjacent sheet-shaped structures.

Preferably, the fixing device comprises a fixing frame for fixing the sheet structure and a positioning connecting piece for connecting the adjacent fixing frames;

the fixing frame is provided with a plurality of positioning grooves matched with the sheet structures for installation.

An imaging device comprising the collimator of any one of the above.

The utility model provides a collimator, which comprises at least two combined units which are arranged up and down, wherein each combined unit comprises a plurality of sheet structures which are arranged side by side and a fixing device for fixing the sheet structures; gaps are arranged between adjacent sheet structures, the gaps in the same combined unit are parallel and uniformly arranged, and the gaps in the adjacent combined units are arranged in a non-parallel mode, so that a plurality of parallel holes are formed in the overlapped parts of all the gaps in the vertical direction.

By using the collimator provided by the utility model, the sheet structure can be processed firstly in the processing and manufacturing process, and the situation of processing holes with small size and large depth can not occur in the processing process of the sheet structure, so the processing process of the sheet structure is relatively simple and the processing efficiency is high; after the processing is finished, assembling the sheet-shaped structure to form combined units, selecting the number of the combined units according to requirements, and finally fixing the combined units so that the overlapped parts of the gaps in all the combined units form parallel holes, wherein the parallel holes can be used for screening gamma rays in different directions in the actual use process.

Compared with the prior art, the utility model provides a processing and the equipment of collimator are convenient, make the processing cost reduce to the machining precision is high, can realize low-cost, the mass production of high accuracy, is favorable to enlarging the application scope of collimator.

Furthermore, the utility model also provides an imaging device including above-mentioned collimator, this imaging device can be the imaging device of the arbitrary suitable collimator, for example: gamma cameras, SPECT, etc.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of the imaging principle of a prior art gamma camera;

FIG. 2 is a schematic structural diagram of collimating holes in a conventional collimator with parallel holes;

fig. 3 is a schematic structural diagram of a first embodiment of an intermediate metal sheet provided by the present invention;

FIG. 4 is a front view of the intermediate metal sheet of FIG. 3;

fig. 5 is a schematic structural diagram of a first embodiment of an end metal sheet provided by the present invention;

fig. 6 is a schematic structural diagram of a specific embodiment of a first pin according to the present invention;

FIG. 7 is an isometric view of the first pin of FIG. 6;

fig. 8 is an exploded view of a first embodiment of a combination unit according to the present invention;

FIG. 9 is a schematic top view of a portion of the combination unit of FIG. 8;

FIG. 10 is an isometric view of a portion of the construction of the combination unit of FIG. 8;

fig. 11 is a schematic structural diagram of a first embodiment of a partial structure of a collimator according to the present invention;

FIG. 12 is a top view of the structure shown in FIG. 11;

fig. 13 is an exploded view of a second embodiment of a collimator according to the present invention;

FIG. 14 is a schematic structural diagram of two sets of combination units in the collimator provided in FIG. 13;

FIG. 15 is a top view of two sets of combination units of FIG. 14;

FIG. 16 is an isometric view of a set of combination units of the collimator of FIG. 13;

FIG. 17 is an isometric view of the sheet structure of FIG. 13;

FIG. 18 is a schematic view of the arrangement of the sheet structures of FIG. 16;

FIG. 19 is a schematic view of the structure of the fixed frame of FIG. 16;

fig. 20 is a top view of the combination unit of fig. 16.

In FIGS. 1-20:

01 is the collimation hole, 02 is the radionuclide, 03 is the scintillation crystal, 04 is the photomultiplier array, 05 is computer processing unit, 1 is the tip sheetmetal, 11 is third side boss, 2 is middle sheetmetal, 21 is first side boss, 22 is second side boss, 3 is first locating hole, 4 is the second locating hole, 5 is first locating pin, 6 is the external screw thread, 7 is first lock nut, 8 is the parallel hole, 9 is fixed frame, 91 is the third locating hole, 92 is the constant head tank, 10 is the third locating pin, 101 is the second lock nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a collimator can reduce the processing degree of difficulty, reduces the processing cost, conveniently realizes high accuracy, low-cost mass production. Another core of the present invention is to provide an image forming apparatus including the above collimator.

Please refer to fig. 1-20.

The collimator provided by the specific embodiment comprises at least two combined units which are arranged up and down, wherein each combined unit comprises a plurality of sheet structures which are arranged side by side and a fixing device for fixing the sheet structures; gaps are arranged between adjacent sheet structures, the gaps in the same combined unit are parallel and uniformly arranged, and the gaps in the adjacent combined units are arranged in a non-parallel mode, so that a plurality of parallel holes 8 are formed in the overlapped parts of all the gaps in the vertical direction.

It should be noted that the shape of the gap between adjacent sheet-like structures may be a rectangular hole, an arc-shaped hole, or a zigzag hole, or may be other shapes meeting the requirements, which is determined according to the actual situation, and is not described herein.

Gaps are formed between adjacent sheet structures, the adjacent sheet structures are not contacted at all, the gaps are formed, or parts of adjacent sheet structures are contacted and partially arranged, and are determined according to actual conditions, and are not described herein any more.

By using the collimator provided by the utility model, the sheet structure can be processed firstly in the processing and manufacturing process, and the sheet structure can not be processed into a hole with small processing size and large depth in the processing process, so that the processing process of the sheet structure is relatively simple, the processing efficiency is high, the processing precision can be ensured, and the probability of scrapping raw materials is reduced; after the processing is finished, assembling the sheet-shaped structure to form combined units, selecting the number of the combined units according to requirements, and finally fixing the combined units, so that the overlapped parts of the gaps in all the combined units form parallel holes 8, and the parallel holes 8 can be used for screening gamma rays in different directions in the actual use process.

Compared with the prior art, the utility model provides a processing and the equipment of collimator are convenient, make the processing cost reduce to the machining precision is high, can realize low-cost, the mass production of high accuracy, is favorable to enlarging the application scope of collimator.

In addition, the parallel holes 8 are composed of overlapped parts of gaps of at least two layers of combination units, and the shapes of the parallel holes 8 can be influenced due to different placement directions of the gaps and the gaps between the adjacent combination units or the change of the number of the combination units; the shape of the parallel holes 8 can thus be square, or rhombic, or polygonal, or circular; of course, other shapes with composite requirements can be also adopted, and the shapes are determined according to actual conditions.

On the basis of the above-described embodiment, in view of excellent radiation absorption performance of tungsten, which is more effective in screening unwanted gamma beams, it is possible to make a sheet structure including end metal pieces 1 at the ends in the arrangement direction thereof and intermediate metal pieces 2 between the end metal pieces 1; the end metal sheet 1 is a tungsten sheet, or a gold sheet, or a platinum sheet, or a tungsten alloy sheet, or a gold alloy sheet, or a platinum alloy sheet; the intermediate metal sheet 2 is a tungsten sheet, or a gold sheet, or a platinum sheet, or a tungsten alloy sheet, or a gold alloy sheet, or a platinum alloy sheet.

Preferably, the end metal pieces 1 and the intermediate metal pieces 2 are made of the same material.

Preferably, the intermediate metal sheets 2 in the same combined unit have the same shape and size for the convenience of processing.

In order to fix the sheet-like structure conveniently, first positioning holes 3 for connecting with a fixing device may be provided at both ends of the end metal sheet 1 in the length direction and both ends of the middle metal sheet 2 in the length direction, and the end metal sheet 1 is provided with second positioning holes 4 for connecting with adjacent combination units.

As shown in fig. 3 and 5, the first positioning hole 3 is provided in the thickness direction of the sheet-like structure in the central axis direction, and the second positioning hole 4 is provided in the height direction of the sheet-like structure in the central axis direction.

Preferably, the first positioning holes 3 are symmetrically arranged in the intermediate metal sheet 2 with respect to the middle section in the longitudinal direction thereof, the first positioning holes 3 are symmetrically arranged in the end metal sheet 1 with respect to the middle section in the longitudinal direction thereof, and the second positioning holes 4 are symmetrically arranged in the end metal sheet 1 with respect to the middle section in the longitudinal direction thereof.

On the basis of the above-mentioned embodiment, the fixing device may include a first positioning pin 5 for cooperating with the first positioning hole 3 and disposed through the first positioning hole 3, a second positioning pin for connecting adjacent combination units and cooperating with the second positioning hole 4, and a locking device for fastening the sheet structure.

As shown in fig. 8-12, in the actual assembly process, the first pin may first sequentially pass through the first positioning holes 3 in the end metal sheet 1, the middle metal sheet 2, and the end metal sheet 1, and two first pin may be used to fix two first positioning holes 3 at two ends of the sheet structure, respectively, and then the sheet structure may be compressed by the locking device, so that adjacent sheet structures may be compressed.

Preferably, external threads 6 can be arranged at both ends of the first positioning pin 5 in the length direction, and the locking device is arranged as a first locking nut 7 matched with the external threads 6; an anti-screw portion for facilitating screwing may be provided to the first lock nut 7.

On the basis of the above embodiment, in order to enable a gap between adjacent sheet structures to meet the requirement, a first side boss 21 facing one side of the thickness direction and a second side boss 22 facing the other side of the thickness direction may be provided at both ends of the middle metal sheet 2 in the length direction, a third side boss 11 facing the same side of the thickness direction may be provided at both ends of the end metal sheet 1 in the length direction, and the heights of the first side boss 21, the second side boss 22 and the third side boss 11 in the same combination unit are the same, so that a uniform gap is formed in the same combination unit.

As shown in fig. 4, the two ends of the middle metal sheet 2 in the thickness direction are both provided with protrusions, when the adjacent middle metal sheets 2 are contacted, after the first side bosses 21 are contacted with the second side bosses 22, the adjacent middle metal sheets 2 are pressed to be nearest, and the middle parts form a gap; one side of the end metal sheet 1 provided with the third side boss 11 faces the middle metal sheet 2 so as to enable the gap to be uniformly arranged; as shown in fig. 9 and 10, after the assembly is completed, a plurality of rectangular gaps are formed in a combination unit and are uniformly distributed; as shown in fig. 11 and 12, by adding one layer of combination units and arranging the gap in the upper combination unit to be perpendicular to the gap in the lower combination unit, the rectangular parallel holes 8 as shown in fig. 12 can be formed.

In another embodiment, the two ends of the middle metal sheet 2 in the length direction may be provided with first bosses facing the same side in the thickness direction and having the same height, the two ends of one of the two end metal sheets 1 in the same combination unit in the length direction may be provided with second bosses facing the same side in the thickness direction, and the heights of the first bosses and the second bosses in the same combination unit are the same, so as to form a uniform gap in the same combination unit.

In the above embodiment, in the process of processing the middle metal sheet 2, the boss is processed only on one side, so that the processing process is further simplified, and the processing difficulty is reduced.

In another specific embodiment, the device can further comprise a spacing component arranged between the adjacent sheet structures, wherein the spacing component is arranged at two ends of the sheet structures in the length direction, and the length of the spacing component is less than half of the length of the sheet structures, so that the adjacent sheet structures are arranged in a clearance manner; in this case, the thickness of the spacer member is the thickness of the gap.

On the basis of the above-described embodiment, it is possible to make the fixing means comprise a fixing frame 9 for fixing the sheet structure and a positioning connector for connecting adjacent fixing frames 9, as shown in fig. 13 to 20; the fixed frame 9 is provided with a number of positioning slots 92 fitted with the sheet-like structure.

As shown in fig. 17 and 18, the sheet-like structures are strip-like structures with regular bends, and in the same combined unit, the lengths of the sheet-like structures are different, the length of the end metal sheet 1 is the shortest, and the lengths of the end metal sheet 1 to the middle metal sheet 2 are gradually increased, so that in order to enable the sheet-like structures to be positioned properly and arranged at intervals, a plurality of fixing grooves 92 for fixing the sheet-like structures can be arranged on the fixing frame 9; as shown in fig. 19 and 20, the sheet structure is arranged along the diagonal direction of the fixed frame 9, and both ends of the sheet structure are mounted in corresponding positioning grooves 92 in the fixed frame 9.

As shown in fig. 13, in order to fixedly connect adjacent combination units, a third positioning hole 91 may be provided in the fixing frame 9, and the vertically adjacent fixing frames 9 are connected by a third positioning pin 10, both ends of the third positioning pin 10 in the length direction are provided with external threads, and a second lock nut 101 is engaged with the external threads on the third positioning pin 10 so as to fix the combination units by the second lock nut 101.

Preferably, the fixing frame 9 is a rectangular frame, and the number of the third positioning holes 91 is four, and the three positioning holes are respectively disposed at four corners of the fixing frame 9.

As shown in fig. 13 to 20, the arrangement direction of the sheet structures in the adjacent combined units is different, and as shown in fig. 13, the lower layer unit is disposed in one diagonal direction of the fixing frame 9, and the upper layer combined unit is disposed in the other diagonal direction of the fixing frame 9.

In addition to the above-mentioned collimator, the present invention also provides an imaging device including the collimator disclosed in the above-mentioned embodiment, the imaging device including any one of the above-mentioned collimators, the imaging device being any imaging device suitable for a collimator, for example: gamma cameras, SPECT, etc.; for the structure of other parts of the imaging device, please refer to the prior art, and the description is omitted here.

It should be noted that, in the present application, the first positioning hole 3, the second positioning hole 4, and the third positioning hole 91, the first positioning pin 5, the second positioning pin, and the third positioning pin, the first side boss 21, the second side boss 22, and the third side boss 11, the first boss and the second boss, and the first, the second, and the third in the first lock nut 7 and the second lock nut 101 are only for limiting the difference in position, and are not sequentially specified.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

The imaging device and the collimator thereof provided by the present invention are described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A collimator is characterized by comprising at least two combined units which are arranged up and down, wherein each combined unit comprises a plurality of sheet structures which are arranged side by side and a fixing device for fixing the sheet structures;

gaps are arranged between every two adjacent sheet-shaped structures, the gaps in the same combined unit are parallel and uniformly arranged, and the gaps in the adjacent combined units are arranged in a non-parallel mode, so that a plurality of parallel holes (8) are formed in the overlapped parts of all the gaps in the vertical direction.

2. Collimator according to claim 1, characterized in that said parallel holes (8) are square holes, or rhombic holes, or polygonal holes, or circular holes.

3. A collimator according to claim 1 or 2, characterized in that said sheet structure comprises end metal sheets (1) at the ends of its alignment direction and intermediate metal sheets (2) between said end metal sheets (1);

the end metal sheet (1) is a tungsten sheet, a gold sheet, a platinum sheet, a tungsten alloy sheet, a gold alloy sheet or a platinum alloy sheet; the intermediate metal sheet (2) is a tungsten sheet, a gold sheet, a platinum sheet, a tungsten alloy sheet, a gold alloy sheet or a platinum alloy sheet.

4. A collimator according to claim 3, wherein both ends of the end metal sheet (1) in the length direction and both ends of the middle metal sheet (2) in the length direction are provided with first positioning holes (3) for connecting with the fixing means, and the end metal sheet (1) is provided with second positioning holes (4) for connecting with an adjacent combination unit.

5. Collimator according to claim 4, characterized in that said fixing means comprise a first positioning pin (5) for cooperating with said first positioning hole (3) and arranged through said first positioning hole (3), a second positioning pin for connecting adjacent said combined units and cooperating with said second positioning hole (4), and locking means for fastening said sheet structure.

6. The collimator according to claim 5, characterized in that both ends of the first positioning pin (5) are provided with an external thread (6), and the locking means is a first locking nut (7) cooperating with the external thread (6).

7. A collimator according to claim 3, characterized in that both ends of the middle metal sheet (2) in the length direction are provided with a first side boss (21) facing one side of the thickness direction and a second side boss (22) facing the other side of the thickness direction, both ends of the end metal sheet (1) in the length direction are provided with a third side boss (11) facing the same side of the thickness direction, and the first side boss (21), the second side boss (22) and the third side boss (11) in the same combination unit have the same height, so that a uniform gap is formed in the same combination unit.

8. The collimator of claim 3, further comprising a spacer member disposed between the adjacent sheet-like structures, wherein the spacer member is disposed at both ends of the sheet-like structures in a length direction, and the length of the spacer member is less than half of the length of the sheet-like structures, so that a gap is disposed between the adjacent sheet-like structures.

9. A collimator according to claim 1 or 2, in which the fixing means comprises a fixing frame for fixing the sheet-like structure and a locating connection for connecting adjacent fixing frames;

the fixing frame is provided with a plurality of positioning grooves matched with the sheet structures for installation.

10. An imaging device, characterized in that it comprises a collimator according to any one of the preceding claims 1-9.

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