JP5667798B2 - Collimator module, multi-row X-ray detector and X-ray CT apparatus - Google Patents

Description

The present invention relates to a collimator module, a manufacturing method thereof, a multi-row X-ray detector having the collimator module, and an X-ray CT (Computed) including the multi-row X-ray detector.
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  In recent years, in an X-ray CT apparatus, the number of X-ray detectors has increased, and the influence of scattered rays in the slice direction (cone angle direction) has become serious. Accordingly, as a collimator for removing scattered radiation arranged on the X-ray incident surface side of the X-ray detector, the collimator plate is sliced not only in the channel direction (fan angular direction) but also in the slice. Various two-dimensional collimators that are arranged in a plurality of directions have been proposed.

  For example, a collimator block (collimator block for channel direction) is inserted in such a manner that a collimator plate is inserted into a plurality of grooves provided in an assembly jig and arranged at predetermined intervals, and the upper and lower surfaces of these collimator plates are integrally bonded to a support plate block) and a slice direction collimator block, and a channel direction collimator in which a plurality of channel direction collimator blocks are arranged and a slice direction collimator in which a plurality of slice direction collimator blocks are arranged in two stages. A collimator has been proposed (see, for example, Patent Document 1 and FIGS. 1 to 4).

  In addition, for example, a collimator is proposed in which grid-like grooves are provided on the X-ray incident surface of an X-ray detector, and a channel direction collimator plate and a slice direction collimator plate are respectively inserted into these grooves and bonded together ( For example, see Patent Document 2 and FIGS.

  In addition, for example, a collimator is proposed in which a collimator plate is bent into a rectangular wave shape, aligned, and combined in a lattice shape (see, for example, Patent Document 3, FIGS. 6A, 6B, etc.).

JP 2002-207082 A JP 2007-082844 A JP-T-2006-526761

  However, the two-dimensional collimators proposed so far, as can be seen from the above example, for example, insert collimator plates into the grooves one by one, or bend the collimator plates and align them in a grid pattern. Manufacture is not easy because it is necessary to assemble.

  Under such circumstances, a collimator module for a multi-row X-ray detector that can remove scattered radiation in the channel direction and the slice direction and can be easily manufactured, a manufacturing method thereof, and a multi-row X having the collimator module An X-ray CT apparatus provided with a line detector and its multi-row X-ray detector is desired.

  In the invention of the first aspect, the wall plate having X-ray absorption is formed in a lattice shape in the channel direction and the slice direction in the multi-row X-ray detector of the X-ray CT apparatus, and a plurality of layers laminated in the channel direction. Each of the X-ray absorbing members has a channel direction as a plate thickness direction, and both plate surfaces substantially correspond to an irradiation direction of an X-ray beam (beam). A collimator module is provided in which a plurality of groove portions extending along the irradiation direction of the X-ray beam are formed on one of the plate surfaces.

  In the invention of the second aspect, the wall plate having X-ray absorption is formed in a lattice shape in the channel direction and the slice direction in the multi-row X-ray detector of the X-ray CT apparatus, and a plurality of layers laminated in the channel direction. Each of the X-ray absorbing members has a channel direction as a plate thickness direction, and both plate surfaces are substantially parallel to an X-ray beam irradiation direction. A collimator module having a certain plate shape and having a plurality of grooves extending along the X-ray beam irradiation direction on both plate surfaces is provided.

  In the invention of the third aspect, wall plates having X-ray absorption are formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector of the X-ray CT apparatus, and are laminated alternately in the channel direction. A plurality of first X-ray absorbing members and a plurality of second X-ray absorbing members, wherein each of the first X-ray absorbing members has a channel direction as a plate thickness direction. Both plate surfaces have a plate shape that is substantially parallel to the irradiation direction of the X-ray beam, and a plurality of spaces extending along the irradiation direction of the X-ray beam are formed inside. Each of the second X-ray absorbing members provides a flat plate shape in which the channel direction is a plate thickness direction and both plate surfaces are parallel to each other, or a collimator module having the plate shape.

  In the invention of the fourth aspect, wall plates having X-ray absorption are formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector of the X-ray CT apparatus, and are laminated alternately in the channel direction. A plurality of first X-ray absorbing members and second X-ray absorbing members, wherein each of the first X-ray absorbing members has a channel direction as a plate thickness direction, The plate surface has a plate shape substantially parallel to the irradiation direction of the X-ray beam, and a plurality of grooves extending along the irradiation direction of the X-ray beam are formed on both plate surfaces. Each of the second X-ray absorbing members is formed in a flat plate shape in which the channel direction is a plate thickness direction and both plate surfaces are parallel to each other, or a collimator module having the plate shape. To do.

  The invention according to a fifth aspect is the collimator according to any one of the first to fourth aspects, wherein the wall plate divides the X-ray incident surface of the multi-row X-ray detector for each detection element. Provide modules.

  The invention of the sixth aspect is a method of manufacturing a collimator module in which a wall plate having X-ray absorption is formed in a lattice shape in a channel direction and a slice direction in a multi-row X-ray detector of an X-ray CT apparatus, The channel direction is the plate thickness direction, and both plate surfaces have a plate shape substantially parallel to the X-ray beam irradiation direction, and one of the plate surfaces is along the X-ray beam irradiation direction. A plurality of first X-ray absorbing members formed with a plurality of recessed portions extending in the channel direction, and bonding the plurality of first X-ray absorbing members to the recessed portions of the plurality of stacked first X-ray absorbing members. And a step of removing an end portion of the corresponding space that is closed in the irradiation direction of the X-ray beam.

  A seventh aspect of the invention is a method of manufacturing a collimator module in which a wall plate having X-ray absorption is formed in a lattice shape in a channel direction and a slice direction in a multi-row X-ray detector of an X-ray CT apparatus, The channel direction is the plate thickness direction, and both plate surfaces have a plate shape substantially parallel to the X-ray beam irradiation direction, and the both plate surfaces are along the X-ray beam irradiation direction. A plurality of first X-ray absorbing members each having a plurality of extending recesses, and a space corresponding to the recesses in the plurality of stacked first X-ray absorbing members. A method of manufacturing a collimator module including a step of removing an end portion covering the X-ray beam in the irradiation direction of the X-ray beam.

  The invention of the eighth aspect is a method of manufacturing a collimator module in which a wall plate having X-ray absorption is formed in a lattice shape in a channel direction and a slice direction in a multi-row X-ray detector of an X-ray CT apparatus, The channel direction is the plate thickness direction, and both plate surfaces have a plate shape substantially parallel to the X-ray beam irradiation direction, and extend on the plate surface along the X-ray beam irradiation direction. The first X-ray absorbing member in which a plurality of openings are formed, and the plate shape in which the channel direction is the plate thickness direction and both the plate surfaces are parallel to each other, or the plate shape Steps of alternately laminating and adhering second X-ray absorbing members in the channel direction, and irradiating the space corresponding to the openings in the plurality of stacked first X-ray absorbing members with the X-ray beam Removing the end plugged in the direction. To provide a method of manufacturing to have a collimator module.

  The invention of the ninth aspect is a method of manufacturing a collimator module in which a wall plate having X-ray absorption is formed in a lattice shape in a channel direction and a slice direction in a multi-row X-ray detector of an X-ray CT apparatus, The channel direction is the plate thickness direction, and both plate surfaces have a plate shape substantially parallel to the X-ray beam irradiation direction, and both plate surfaces extend along the X-ray beam irradiation direction. A first X-ray absorbing member formed with a plurality of extending recesses, and a plate shape in which the channel direction is a plate thickness direction and both plate surfaces are parallel to each other, or the plate shape And alternately laminating and adhering the second X-ray absorbing members in the channel direction, and irradiating the space corresponding to the recesses in the plurality of stacked first X-ray absorbing members with the X-ray beam To remove the end that is plugged in the direction To provide a method of manufacturing a collimator module having and.

  The invention of the tenth aspect is the step of generating the first X-ray absorbing member by subjecting the X-ray absorber to electrical discharge machining, etching or excavation before the step of laminating and bonding. A method of manufacturing a collimator module according to any one of the sixth to ninth aspects is further provided.

  According to an eleventh aspect of the present invention, before the step of laminating and adhering, the mixed material of the X-ray absorber powder and a predetermined resin is molded in a mold and sintered, whereby the first X The manufacturing method of the collimator module of any one viewpoint of the said 6th viewpoint to the 9th viewpoint which further has the process of producing | generating a line | wire absorption member.

  The invention of the twelfth aspect provides a multi-row X-ray detector in which a plurality of collimator modules according to any one of the first to fifth aspects are arranged in the channel direction on the X-ray incident surface. To do.

  An invention of a thirteenth aspect provides an X-ray CT apparatus provided with the multi-row X-ray detector of the twelfth aspect.

  According to the invention of the above aspect, it is possible to form a lattice-like wall plate that absorbs and removes scattered radiation by simply laminating only one or two types of X-ray absorbing members. A collimator module for a multi-row X-ray detector that can remove scattered radiation and can be easily manufactured can be provided.

It is an external view of an X-ray CT apparatus. It is a functional block diagram which shows roughly the structure of a X-ray CT apparatus. It is a perspective view of an X-ray detector and a collimator. It is a figure which shows the structure of the collimator module by 1st embodiment. It is a figure which shows the shape of a 1st X-ray absorption member. It is a figure when the 1st X-ray absorption member, an X-ray tube, and an X-ray detector are seen in the slice direction. It is a figure when the 1st X-ray absorption member, an X-ray tube, and an X-ray detector are seen in a channel direction. It is a flowchart which shows the 1st example (1st manufacturing method) of the manufacturing method of the collimator module by 1st embodiment. It is the figure which showed the process in which the collimator module was completed by the 1st manufacturing method with the image. It is a flowchart which shows the 2nd example (2nd manufacturing method) of the manufacturing method of the collimator module by 1st embodiment. It is the figure which showed the process in which a collimator module is completed by the 2nd manufacturing method with the image. It is a figure which shows the shape of a 2nd X-ray absorption member. It is a figure which shows the structure of the collimator module by 2nd embodiment. It is a figure which shows the shape of a 3rd X-ray absorption member. It is a figure which shows the shape of a 4th X-ray absorption member. It is a figure which shows the structure of the collimator module by 3rd embodiment. It is a figure which shows the shape of a 5th X-ray absorption member (group). It is a figure which shows the shape of a 6th X-ray absorption member. It is a flowchart which shows the manufacturing method (5th manufacturing method) of the collimator module by 3rd embodiment. It is the figure which showed the process in which a collimator module was completed by the 5th manufacturing method with the image. It is a figure which shows the shape of the 7th X-ray absorption member used for a 5th manufacturing method. It is a figure which shows the collimator module by 4th embodiment. It is a figure which shows the shape of the 8th X-ray absorption member. It is a flowchart which shows the 1st example (6th manufacturing method) of the manufacturing method of the collimator module by 4th embodiment. It is the figure which showed the process in which a collimator module was completed by the 6th manufacturing method with the image. It is a flowchart which shows the 2nd example (7th manufacturing method) of the manufacturing method of the collimator module by 4th embodiment. It is the figure which showed the process in which a collimator module was completed by the 7th manufacturing method with the image. It is a figure which shows the shape of the 9th X-ray absorption member used for a 7th manufacturing method.

  Embodiments of the invention will be described below.

(First embodiment)
FIG. 1 is an external view of an X-ray CT apparatus, and FIG. 2 is a functional block diagram schematically showing the configuration of the X-ray CT apparatus. As shown in FIGS. 1 and 2, the X-ray CT apparatus 10 has a gantry 12. The gantry 12 has an X-ray tube 14, and an X-ray beam of X-rays 16 is projected from the X-ray tube 14 toward an X-ray detector 18 on the opposite side of the gantry 12. The X-ray detector 18 is formed by a plurality of detector modules 18m, and each of the detector modules 18m senses a projected X-ray transmitted through the imaging target 22. Each detector module 18m outputs an electrical signal representing the intensity of the incident X-ray beam and the attenuation of the X-ray beam transmitted through the object 22 to be imaged. A collimator 20 is disposed on the X-ray incident surface side of the X-ray detector 18. The collimator 20 is formed by a plurality of collimator modules 100a and removes scattered X-ray scattered rays. During the scan to collect X-ray projection data, the gantry 12 and the components mounted on it rotate about the center of rotation 24.

  As shown in FIG. 2, the rotation of the gantry 12 and the operation of the X-ray tube 14 are governed by the control mechanism 26 of the X-ray CT apparatus 10. The control mechanism 26 includes an X-ray controller 28 that supplies power and timing signals to the X-ray tube 14 and a gantry motor controller 30 that controls the rotational speed and position of the gantry 12. It is out. The data collection system (DAS) 32 of the control mechanism 26 collects data from the detector module 100. The image reconstructor 34 receives sampling and digital X-ray detection data (data) from the DAS 32 and performs high-speed image reconstruction. The reconstructed image is applied as input to a computer 36 that stores the image in a storage device 38.

  The computer 36 also receives commands and scanning parameters from an operator via a console 40 with a keyboard. A combined display 42 allows the operator to view the reconstructed image and other data from the computer 36. Operator supplied commands and parameters are used by the computer 36 to supply control signals and information to the DAS 32, X-ray controller 28 and gantry motor controller 30. Further, the computer 36 operates the table / motor control device 44 that controls the imaging table 46 to place the imaging target 22 at a position in the gantry 12. In particular, the imaging table 46 partially moves the imaging target 22 through the gantry opening 48.

  The computer 36 also reads instructions and data from a computer-readable storage medium 52 such as a flexible disk, a CD-ROM, and a USB memory, and conversely stores data and the like in the storage medium 52. A device 50 is included.

  FIG. 3 is a perspective view of the X-ray detector and the collimator.

  As shown in FIG. 3, the X-ray detector 18 includes a plurality of detector modules 18m. Each detector module 18m has a plurality of detection elements 18i arranged in a matrix in the channel direction CH and the slice direction SL. The channel direction CH is the spreading direction of the X-rays 16 emitted from the X-ray focal point (X-ray source) f of the X-ray tube 14, that is, the fan angle direction, and the slice direction SL is the thickness direction of the X-rays 16, that is, the cone angle direction. It is. Each detector module 18m is arranged adjacent to the channel direction CH. Thus, the plurality of detector modules form a multi-row X-ray detector in which a plurality of detector rows in the channel direction CH are arranged in the slice direction SL.

  As shown in FIG. 3, a collimator 20 for removing scattered radiation is disposed on the X-ray incident surface side of the X-ray detector 18. The collimator 20 includes a plurality of collimator modules 100a. Each collimator module 100a is disposed at a corresponding position above each detector module 18m.

  The collimator module 100a is formed with a lattice-like wall plate 100x extending in the channel direction CH and the slice direction SL. The lattice-like wall plate 100x divides the X-ray detection region of the detector module 18m into a plurality of regions arranged in the channel direction CH and the slice direction SL. In this example, each of the plurality of regions is a region corresponding to each detection element 18i of the detector module 18m. Therefore, the lattice-like wall plate 100x separates the passage regions of the X-ray beams of the X-rays 16 incident from the X-ray focal point f of the X-ray tube 14 toward the detection elements 18i of the detector module 18m. . As a result, the lattice-like wall plate 100x absorbs and removes X-rays, that is, scattered rays by a path other than the linear path from the X-ray focal point f to the detection element 18i.

  Here, in order to facilitate understanding, the detector module 18m is shown in which the detector elements 18i in the channel direction CH × slice direction SL = 4 × 8 are arranged in a matrix. Similarly, an X-ray detector 18 in which eight such detector modules 18m are arranged in the channel direction CH is shown. However, in practice, the detector module is, for example, a channel direction CH × slice direction SL = 64 × 256 detector elements arranged in a matrix. The X-ray detector is, for example, one in which 16 such detector modules are arranged in the channel direction CH. The size (size) of the detection element is, for example, about 0.5 to 1.0 [mm] square.

  The structure of the collimator module will now be described in detail.

  FIG. 4 is a diagram showing the configuration of the collimator module according to the first embodiment. As shown in FIG. 4, the collimator module 100a according to the first embodiment includes a plurality of first X-ray absorbing members 101 stacked in the channel direction CH.

  FIG. 5 is a diagram illustrating the shape of the first X-ray absorbing member 101. In FIG. 5, the center view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, the left view is a side view, and the shaded portion is a surface formed inside the member. (The same applies hereinafter). 6 and 7 are diagrams for explaining the positional relationship between the first X-ray absorbing member 101, the X-ray focal point f of the X-ray tube 14, and the detection element 18i in the X-ray detector 18. is there.

As shown in FIG. 5, the first X-ray absorbing member 101 has a tapered plate shape as a rough shape. That is, when the first X-ray absorbing member 101 is assembled as a collimator module and arranged at an appropriate position on the X-ray incident surface side of the X-ray detector 18, as shown in FIG. Is a plate thickness direction, and both plate surfaces 101a and 101b have a plate shape substantially parallel to the irradiation direction of the X-ray beam from the X-ray focal point f. Here, an angle formed by a straight line connecting the X-ray focal point f and one end of the detection element 18i in the channel direction CH and a straight line connecting the X-ray focal point f and the other end of the detection element 18i in the channel direction CH is Δα. To do. At this time, both plate surfaces 101a and 101b of the first X-ray absorbing member 101 are inclined such that their extension lines form an angle Δα. As shown in FIG. 5, both plate surfaces 101a and 101b of the first X-ray absorbing member 101 have a rectangular shape having end sides parallel to the slice direction SL. The plate thickness S ₁₀₁ at the end of the first X-ray absorbing member 101 on the X-ray detector 18 side is substantially the same as the width d of one detection element.

  As shown in FIG. 5, a plurality of groove portions 101 m are formed on one plate surface 101 a of the first X-ray absorbing member 101. As shown in FIG. 7, each groove 101m extends from the X-ray focal point f along each X-ray beam XB incident radially to the plurality of detection elements 18i arranged in the slice direction SL of the detector module 18m. , So as to penetrate. A space corresponding to each groove 101m, that is, a space recessed from the plate surface has substantially the same shape as a part of the passage region of each X-ray beam XB, and corresponds to a part of a square pan. That is, in each groove 101m, each wall surface forming the groove 101m is inclined so as to face the X-ray focal point f, and the groove width in the slice direction SL becomes narrower as it approaches the X-ray focal point f. .

In this example, as shown in FIG. 5, the plate thickness at the end on the X-ray detector 18 side of the wall plate extending in the channel direction CH and the slice direction SL forming the groove 101m is the first X Except for both ends of the line absorbing member 101 in the slicing direction SL, the same plate thickness t is, for example, about 0.1 to 0.3 [mm]. Further, the groove width W _101m in the slice direction SL and the depth U _101m in the channel direction CH at the end of the groove 101m on the X-ray detector 18 side are determined by the thickness t of the wall plate from the width d of one detection element. The drawn length (dt).

  In the collimator module 100a according to the first embodiment, the U-shaped wall plate forming the groove portion 101m in the one plate surface 101a of the first X-ray absorbing member 101 and the other first X-ray absorption adjacent thereto. A wall plate that surrounds the X-ray beam XB incident on the detection element 18i in four directions is formed by combining with the flat wall plate forming the other plate surface (plate surface on which no groove portion is formed) 101b of the member 101. The A plurality of wall plates surrounding the X-ray beam XB are thus formed in the channel direction CH and the slice direction SL. Thereby, as a whole, a lattice-like wall plate 100x is formed that divides the X-ray detection region in the detector module 18m into regions of a plurality of detection elements 18i arranged in the channel direction CH and the slice direction SL. The lattice-like wall plate 100x separates the X-ray beams XB incident on the individual detection elements 18i from the X-ray focal point f and removes scattered rays in the channel direction CH and the slice direction SL.

  Next, a method for manufacturing the collimator module according to the first embodiment will be described.

  FIG. 8 is a flowchart showing a first example (first manufacturing method) of a method for manufacturing a collimator module according to the first embodiment, and FIG. 9 is an image showing a process in which a collimator module is completed by the manufacturing method. It is.

  In step SA1, the tapered plate 110 having the above-described tapered plate shape is generated. For example, a rectangular flat plate made of a material whose main component is molybdenum (molybdenum), tungsten (tungsten) or the like is generated, and one or both plate surfaces of the flat plate are processed obliquely. For example, electric discharge machining or grinding by a grinder can be used for the machining here.

  In step SA2, one plate surface of the taper plate 110 generated in step SA1 is processed to form the groove 101m, and the first X-ray absorbing member 101 is obtained. For example, electric discharge machining, chemical etching, excavation by a router, or the like can be used for the machining here.

  In step SA3, a plurality of the first X-ray absorbing members 101 obtained in step SA2 are stacked in the channel direction CH and bonded together. For example, a work table (not shown) that is concavely curved in an arc shape with substantially the same curvature as the X-ray incident surface of the X-ray detector 18 is prepared. The first X-ray absorbing member 101 is sequentially laminated in the same direction in the channel direction CH while thinly applying an adhesive to the plate surface 101a on which the groove portion 101m of the first X-ray absorbing member 101 is formed. Place it on the table and arrange the outline. The plurality of stacked first X-ray absorbing members 101 are pressed with a predetermined pressing body from both ends in the channel direction CH until the adhesive is cured. This completes the collimator module 100a. The adhesive should be resistant to mechanical vibration and less deteriorated by X-ray irradiation. For example, epoxy, urethane, acrylic, etc. should be used. Can do. Further, the lamination and adhesion of the first X-ray absorbing member 101 may be performed manually or using a robot.

  FIG. 10 is a flowchart showing a second example (second manufacturing method) of a method for manufacturing a collimator module according to the first embodiment, and FIG. 11 shows an image of a process of producing a collimator module by the manufacturing method. It is. In the second manufacturing method, instead of the first X-ray absorbing member 101, a second X-ray absorbing member 102 having a similar shape is used.

  FIG. 12 is a diagram showing the shape of the second X-ray absorbing member 102. 12, the center view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, and the left view is a side view.

  As shown in FIG. 12, the second X-ray absorbing member 102 has the first X-ray absorbing member 101 as a base, the inclination of both plate surfaces 101a and 101b, and the shape and size of each groove 101m. The two plate surfaces 101a and 101b have a shape formed by extending the ends so as to extend to the X-ray incident side and the X-ray emission side, respectively.

That is, like the first X-ray absorbing member 101, the second X-ray absorbing member 102 has a tapered plate shape as a rough shape. Both plate surfaces 102a and 102b of the second X-ray absorbing member 102 have a rectangular shape having end sides parallel to the slice direction SL. Similarly to the first X-ray absorbing member 101, the second X-ray absorbing member 102 has the channel direction CH as the plate thickness direction, and both the plate surfaces 102a and 102b are separated from the X-ray focal point f. The plate shape is substantially parallel to the X-ray beam irradiation direction. In this example, both the plate surfaces 102a and 102b are inclined so that their extension lines form an angle Δα. The plate thickness _S102 at the end of the second X-ray absorbing member 102 on the X-ray emission side is slightly larger than the width d of one detection element.

  As shown in FIG. 12, a plurality of recesses 102 h are formed on one plate surface 102 a of the second X-ray absorbing member 102.

As shown in FIG. 12, each recess 102h extends from the X-ray focal point f along each X-ray beam XB incident radially to the plurality of detection elements 18i arranged in the slice direction SL of the detector module 18m. The length is such that it does not penetrate. A space corresponding to each recess 102h has substantially the same shape as a part of the passage region of each X-ray beam XB, and corresponds to a part of a square pan. The width W _102h in the slice direction SL and the depth U _102h in the channel direction SL at the end of the concave portion 102h on the X-ray incident side are a length obtained by subtracting the thickness t of the wall plate from the width d of one detection element (d -T). Further, the plate thickness S _102h of the second X-ray absorbing member 102 at the end portion of the concave portion 102h on the X-ray emission side is substantially the same as the width d of one detection element.

  In step SB1, a tapered plate 110 made of an X-ray absorber is generated by the same method as in step SA1.

  In step SB2, one plate surface of the tapered plate 110 generated in step SB1 is processed to form a recess 102h having the same shape and size as the groove 101m, and the second X-ray absorbing member 102 is obtained.

  In step SB3, a plurality of second X-ray absorbing members 102 obtained in step SB2 are stacked in the channel direction CH and bonded together.

  In Step SB4, both end portions 102t that block the space corresponding to the concave portion 102h in the stacked second X-ray absorbing member 102 in the irradiation direction of the X-ray beam XB are removed. For example, electric discharge machining, cutting with a cutter, polishing with a grinder, or the like is used to remove both ends 102t (the shaded curved surface in step SB4 in FIG. 11 is an image of a cutter). This completes the collimator module 100a.

  The second X-ray absorbing member 102 has a shape formed by extending only one end portion of the first X-ray absorbing member 101 on the X-ray focal point f side or the X-ray detector 18 side. One end of the second X-ray absorbing member 102 may be removed after the second X-ray absorbing member 102 is laminated.

  According to such a first embodiment, it is possible to form the lattice-like wall plate 100x that absorbs and removes scattered radiation by simply laminating only one type of X-ray absorbing member, and the collimator module can be simplified. Can be manufactured by a simple method. In addition, it is not generated by inserting a collimator plate into the groove or bending the plate by sheet metal processing, but by stacking X-ray absorbing members, so it has high accuracy, strength and rigidity. It is advantageous. In addition, since it is basically composed of a single material, there is little expansion and contraction of the material due to changes in environmental temperature.

  Further, according to the first manufacturing method, the collimator module can be completed only by the process of laminating only one type of X-ray absorbing member, and parts management and assembly work are extremely easy.

  In addition, according to the second manufacturing method, the rigidity at the time of stacking and bonding the X-ray absorbing member can be increased, deformation and distortion of each wall plate can be suppressed, and the mechanical accuracy of the collimator module can be improved.

(Second embodiment)
FIG. 13 is a diagram illustrating a configuration of a collimator module according to the second embodiment. The collimator module 100b according to the second embodiment has the same tapered plate shape and size as the first X-ray absorbing member 101 as a rough shape, and the groove portions similar to the groove portions 101m are formed on both plate surfaces 103a and 103b. A plurality of third X-ray absorbing members 103, in which 103m is formed in a plane symmetry at half the depth, are stacked in the channel direction CH.

  FIG. 14 is a view showing the shape of the third X-ray absorbing member 103. In FIG. 14, the central view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, and the left view is a side view.

As shown in FIG. 14, the third X-ray absorbing member 103 has a tapered plate shape as a rough shape. Both plate surfaces 103a and 103b of the third X-ray absorbing member 103 have a rectangular shape having end sides parallel to the slice direction SL. Further, as shown in FIG. 14, the third X-ray absorbing member 103 has the channel direction CH as the plate thickness direction, and both the plate surfaces 103a and 103b each of the X-ray beam from the X-ray focal point f. It has a plate shape that is substantially parallel to the irradiation direction. In this example, both plate surfaces 103a and 103b are inclined so that their extension lines form an angle Δα. The plate thickness S ₁₀₃ at the end of the third X-ray absorbing member 103 on the X-ray emission side is substantially the same as the width d of one detection element.

As shown in FIG. 14, on both plate surfaces 103a and 103b of the third X-ray absorbing member 103, groove portions 103m similar to the groove portions 101m are formed in plane symmetry. However, the groove width W _103m in the slice direction at the end portion of the groove portion 103m on the X-ray detector 18 side is the same length (dt) as the groove width W _101m of the groove portion 101m, but the depth in the channel direction CH U _103m is half the length of the depth U _{101 m} of the groove 101m (d-t) / 2 .

  In the collimator module 100b according to the second embodiment, a U-shaped wall plate that forms the groove 103m in one plate surface 103a of the third X-ray absorbing member 103, and another third X-ray absorption adjacent thereto. A wall plate that surrounds the X-ray beam XB incident on the detection element 18i in four directions is formed by combining with the inverted U-shaped wall plate forming the groove 103m on the other plate surface 103b of the member 103. A plurality of wall plates surrounding the X-ray beam XB are thus formed so as to be aligned in the channel direction CH and the slice direction SL. Thereby, as a whole, a lattice-like wall plate 100x is formed that divides the X-ray detection region in the detector module 18m into regions of a plurality of detection elements 18i arranged in the channel direction CH and the slice direction SL.

  Next, the manufacturing method of the collimator module by 2nd embodiment is demonstrated.

  As in the first manufacturing method in the first embodiment, the first example (third manufacturing method) of the collimator module manufacturing method according to the second embodiment includes a third X-ray absorbing member 103 as shown in FIG. This is a method of generating and laminating and bonding this in the channel direction CH.

  Moreover, the 2nd example (4th manufacturing method) of the manufacturing method of the collimator module by 2nd embodiment is the 4th X-ray absorption member 104 as shown in FIG. 15 similarly to the 2nd manufacturing method in 1st embodiment. Is formed, laminated and bonded in the channel direction CH, and an excessive end portion is removed.

  As shown in FIG. 15, the fourth X-ray absorbing member 104 has both plate surfaces in the third X-ray absorbing member 103 while maintaining the inclination of both plate surfaces 103 a and 103 b and the shape of each groove portion 103 m. 103a and 103b are extended to the X-ray incident side and the X-ray emission side, respectively.

That is, the fourth X-ray absorbing member 104 has a tapered plate shape as a rough shape, like the third X-ray absorbing member 103. The fourth X-ray absorbing member 104 has the channel direction CH as the plate thickness direction, and both plate surfaces 104a and 104b are substantially parallel to the irradiation direction of the X-ray beam from the X-ray focal point f. It has a plate shape. In this example, both plate surfaces 104a and 104b are inclined so that their extension lines form an angle Δα. Both plate surfaces 104a and 104b of the fourth X-ray absorbing member 104 have a rectangular shape having end sides parallel to the slice direction SL. The plate thickness S ₁₀₄ at the end of the fourth X-ray absorbing member 104 on the X-ray emission side is slightly larger than the width d of one detection element.

  As shown in FIG. 15, a plurality of recesses 104 h are formed in plane symmetry on both plate surfaces 104 a and 104 b of the fourth X-ray absorbing member 104.

Each concave portion 104h on each plate surface extends along each X-ray beam XB incident on each of eight detection elements 18i arranged in the slice direction SL from the X-ray focal point f, and is formed with a length that does not penetrate. Has been. The depth U _104h in the channel direction CH at the end of each concave portion 104h on the X-ray detector 18 side is half the length (dt) / 2 of the depth U _101m of the groove 101m, like the groove _103m. . A space corresponding to each recess 104h has substantially the same shape as a part of the passage region of each X-ray beam XB, and corresponds to a part of a square pan.

The plate thickness S _104h of the fourth X-ray absorption member 104 at the end of the recess 104h on the X-ray detector 18 side is substantially the same as the width d of one detection element.

  In the collimator module 100b according to the second embodiment, the position of the X-ray beam XB separated by the lattice-like wall plate 100x and the position of each detection element 18i of the detector module 18m are equivalent to half of the detection elements. It is shifted in the channel direction CH by the width d / 2. Therefore, it is necessary to dispose the collimator module 100b in the channel direction CH with respect to the detector module 18m by a width d / 2 corresponding to half of the detection elements.

  According to the second embodiment, as in the first embodiment, the lattice-like wall plate 100x that absorbs and removes scattered radiation is formed by stacking only one type of X-ray absorbing member. The collimator module can be manufactured by a simple method. In addition, it is not generated by inserting a collimator plate into the groove or bending the plate by sheet metal processing, but by stacking X-ray absorbing members, so it has high accuracy, strength and rigidity. It is advantageous. In addition, since it is basically composed of a single material, there is little expansion and contraction of the material due to changes in environmental temperature.

  Moreover, according to such 2nd embodiment, since the 3rd X-ray absorption members 103 and 104 by which the groove part and recessed part are formed in both board surfaces are used, especially simultaneous processing of both board surfaces is carried out. A collimator module can be efficiently manufactured when using an etching process using a possible chemical solution.

  Moreover, according to the third manufacturing method, the collimator module can be completed only by the process of laminating only one type of X-ray absorbing member, and parts management and assembly work are extremely easy.

  In addition, according to the fourth manufacturing method, the rigidity at the time of stacking and bonding of the X-ray absorbing member can be increased, deformation and distortion of each wall plate can be suppressed, and the mechanical accuracy of the collimator module can be improved.

(Third embodiment)
FIG. 16 is a diagram showing a configuration of a collimator module according to the third embodiment. The collimator module 100c according to the third embodiment has a fifth X-ray absorbing member (group) 105 having a shape obtained by penetrating the groove 101m in the channel direction CH in the first X-ray absorbing member 101 as a whole. And the plate-shaped sixth X-ray absorbing members 106 are alternately stacked in the channel direction CH.

  As shown in FIG. 17, the fifth X-ray absorbing member (group) 105 has a tapered plate shape as a general outline, and the plate surfaces 105a and 105b on the outline form in the slice direction SL. It has a rectangular shape with parallel edges. In addition, as shown in FIG. 17, the fifth X-ray absorbing member (group) 105 has the channel direction CH as the plate thickness direction, and both the plate surfaces 105a and 105b have X-rays from the X-ray focal point f. It has a plate shape that is substantially parallel to the irradiation direction of the line beam. In this example, both plate surfaces 105a and 105b are inclined so that their extension lines form an angle Δα ′ (<Δα).

  As shown in FIG. 18, the sixth X-ray absorbing member 106 has a flat plate shape in which the channel direction CH is a plate thickness direction as a rough shape, and both the plate surfaces 106a and 106b are parallel to each other. The surfaces 106a and 106b have a rectangular shape with end sides parallel to the slice direction SL. The plate surfaces 106a and 106b are flat surfaces.

The plate thickness S ₁₀₅ at the end on the X-ray emission side in the overall outline of the fifth X-ray absorbing member (group) 105 is obtained by subtracting the plate thickness t of the wall plate from the width d of one detection element. Length (dt). In addition, the plate thickness S ₁₀₆ at the end of the sixth X-ray absorbing member 106 on the X-ray emission side is substantially the same as the plate thickness t of the wall plate. That is, the thickness S ₁₀₅ of the fifth X-ray absorption member (s) 105, the combined length of the thickness S ₁₀₆ of the X-ray absorbing member 106 of the sixth, the width d of the detection element 1 minute It is substantially the same.

As shown in FIG. 17, the fifth X-ray absorbing member (group) 105 has a plurality of spaces 105k. As shown in FIG. 17, each space 105k extends along each X-ray beam XB that radially enters the plurality of detection elements 18i arranged in the slice direction SL from the X-ray focal point f, and is formed so as to penetrate therethrough. Yes. Each space 105k has substantially the same shape as a part of the passage region of each X-ray beam XB, and corresponds to a part of a square pan. The width W _105k in the slice direction SL and the depth U _105k in the channel direction CH at the end of the space 105k on the X-ray detector 18 side are the length obtained by subtracting the plate thickness t of the wall plate from the width d of one detection element. (Dt).

  In the collimator module 100c according to the third embodiment, the wall plate in contact with the space 105k formed in the fifth X-ray absorbing member (group) 105, and the walls of the two sixth X-ray absorbing members 106 adjacent thereto. In combination with the plate, a wall plate that surrounds the X-ray beam XB incident on the detection element 18i in four directions and separates it in the channel direction and the slice direction is formed. A plurality of wall plates surrounding the X-ray beam XB are thus formed so as to be aligned in the channel direction CH and the slice direction SL. Thereby, as a whole, a lattice-like wall plate 100x is formed that divides the X-ray detection region in the detector module 18m into regions of a plurality of detection elements 18i arranged in the channel direction CH and the slice direction SL. The lattice-like wall plate 100x separates the X-ray beams XB incident on the individual detection elements 18i from the X-ray focal point f and removes scattered rays in the channel direction CH and the slice direction SL.

  Next, the manufacturing method of the collimator module by 3rd embodiment is demonstrated.

  FIG. 19 is a flowchart showing a collimator module manufacturing method (fifth manufacturing method) according to the third embodiment, and FIG. 20 shows an image of a process of producing a collimator module by the manufacturing method.

  FIG. 21 is a diagram showing the shape of the seventh X-ray absorbing member 107 used in the fifth manufacturing method. In FIG. 21, the center view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, and the left view is a side view.

  As shown in FIG. 21, the seventh X-ray absorbing member 107 has a tapered plate shape as a rough shape, and the plate surfaces 107a and 107b have a rectangular shape having edges parallel to the slice direction SL. doing. Further, as shown in FIG. 21, the seventh X-ray absorbing member 107 has the channel direction CH as the plate thickness direction, and both the plate surfaces 107a and 107b each have an X-ray beam from the X-ray focal point f. It has a plate shape that is substantially parallel to the irradiation direction. In this example, both plate surfaces 107a and 107b are inclined so that their extension lines form an angle Δα ′ (<Δα). The plate thickness at the end of the seventh X-ray absorbing member 107 on the X-ray emission side is slightly larger than the length (dt) obtained by subtracting the plate thickness t of the wall plate from the width d of one detection element. .

As shown in FIG. 21, the seventh X-ray absorbing member 107 is formed with a plurality of openings 107k penetrating in the channel direction CH. As shown in FIG. 21, each opening 107k is formed along each X-ray beam XB incident on each of the plurality of detection elements 18i arranged in the slice direction SL from the X-ray focal point f. Each opening 107k has substantially the same shape as a part of the passage region of each X-ray beam XB, and corresponds to a part of a square pan. The width W _107k in the slice direction SL and the depth U _107k in the channel direction CH at the end of each opening 107k on the X-ray emission side are the same as the width W _101m and the depth U _101m of the groove 101m, and the length ( d-t).

  In step SE1, a tapered plate 110 made of an X-ray absorber is generated by the same method as in step SA1.

  In step SE2, the plate surface of the tapered plate 110 generated in step SE1 is processed to form an opening 107k having the same shape and size as the groove 101m, and the seventh X-ray absorbing member 107 is obtained.

  In step SE3, a flat plate-like sixth X-ray absorbing member 106 made of an X-ray absorber is generated.

  In step SE4, the seventh X-ray absorbing member 107 obtained in step SE2 and the sixth X-ray absorbing member 106 obtained in step SE3 are alternately stacked in the channel direction CH and bonded to each other.

  In step SE5, both end portions 107t blocking the space corresponding to the opening 107k in the stacked seventh X-ray absorbing member 107 in the direction of the X-ray beam XB are removed (shaded curve in step SE5 in FIG. 20). The surface is the image of a cutter). Thus, the collimator module 100 is completed.

  According to such a third embodiment, it is possible to form the lattice-like wall plate 100x that absorbs and removes scattered radiation by simply laminating only two types of X-ray absorbing members, and a collimator module. Can be produced by a simple method. In addition, it is not generated by inserting a collimator plate into the groove or bending the plate by sheet metal processing, but by stacking X-ray absorbing members, so it has high accuracy, strength and rigidity. It is advantageous. In addition, since it is basically composed of a single material, there is little expansion and contraction of the material due to changes in environmental temperature.

  Moreover, according to the fifth manufacturing method, the rigidity at the time of lamination and adhesion of the X-ray absorbing member can be increased, deformation and distortion of each wall plate can be suppressed, and the mechanical accuracy of the collimator module can be improved.

  The opening 107k in the seventh X-ray absorbing member 107 may be a recess that does not completely penetrate in the channel direction. In this case, the plate thickness of the flat plate-like sixth X-ray absorbing member 106 may be reduced accordingly.

(Fourth embodiment)
FIG. 22 is a diagram showing a collimator module according to the fourth embodiment. The collimator module 100d according to the fourth embodiment includes an eighth X-ray absorbing member 108 in which groove portions similar to the groove portions 101m are formed on both plate surfaces 108a and 108b in the same depth and in plane symmetry, and a flat plate shape. Sixth X-ray absorbing members 106 are alternately stacked in the channel direction CH.

  FIG. 23 is a view showing the shape of the eighth X-ray absorbing member 108. 23, the center view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, and the left view is a side view.

As shown in FIG. 23, the eighth X-ray absorbing member 108 has a tapered plate shape as a rough shape. Both plate surfaces 108a and 108b of the eighth X-ray absorbing member 108 have a rectangular shape having end sides parallel to the slice direction SL. Further, as shown in FIG. 23, the eighth X-ray absorbing member 108 has the channel direction CH as the plate thickness direction, and both plate surfaces 108a and 108b are inclined so as to face the X-ray focal point f. ing. In this example, both plate surfaces 108a and 108b are inclined so that their extension lines form an angle Δα + Δα ′ (<Δα × 2). Thickness S ₁₀₈ at the end of the X-ray exit side of the eighth of the X-ray absorbing member 108, the detecting element corresponding to two width 2d is wallboard plate thickness S ₁₀₆ of the sixth X-ray absorbing member 106 The length (2d−t) is obtained by subtracting the plate thickness t.

As shown in FIG. 23, on both plate surfaces 108a, 108b of the eighth X-ray absorbing member 108, groove portions 108m similar to the groove portions 101m are formed in plane symmetry. The depth U _108m in the channel direction CH at the end of the groove 108m on the X-ray emission side is the same as the depth U _101m of the groove 101m.

  In the collimator module 100d according to the fourth embodiment, a U-shaped wall plate forming the groove 108m of one plate surface 108a of the eighth X-ray absorbing member 108, and the sixth X-ray absorbing member 106 adjacent thereto. In combination with a flat wall plate forming the other plate surface 106b, a wall plate surrounding the X-ray beam XB incident on the detection element 18i in four directions is formed. Similarly, an inverted U-shaped wall plate forming the groove 108m of the other plate surface 108b of the eighth X-ray absorbing member 108 and one plate surface 106a of the sixth X-ray absorbing member 106 adjacent thereto. Are combined with the flat wall plate forming the X-ray beam XB incident on the detection element 18i in four directions. A plurality of wall plates surrounding the X-ray beam XB are formed so as to be aligned in the channel direction CH and the slice direction SL. Thereby, as a whole, a lattice-like wall plate 100x is formed that divides the X-ray detection region in the detector module 18m into regions of a plurality of detection elements 18i arranged in the channel direction CH and the slice direction SL.

  Next, a method for manufacturing a collimator module according to the fourth embodiment will be described.

  FIG. 24 is a flowchart showing a first example (sixth manufacturing method) of a method for manufacturing a collimator module according to the fourth embodiment, and FIG. 25 shows an image of a process of producing a collimator module by the manufacturing method. It is.

  In step SF1, a tapered plate 110 made of an X-ray absorber is generated by the same method as in step SA1.

  In step SF2, both the plate surfaces of the taper plate 110 generated in step SF1 are processed to form the groove 108m on each plate surface, thereby obtaining the eighth X-ray absorbing member 108.

  In step SF3, a plate-shaped sixth X-ray absorbing member 106 made of an X-ray absorber is generated.

  In step SF4, the eighth X-ray absorbing member 108 obtained in step SF2 and the sixth X-ray absorbing member 106 obtained in step SF3 are alternately stacked in the channel direction CH and bonded to each other.

  FIG. 26 is a flowchart showing a second example (seventh manufacturing method) of a method of manufacturing a collimator module according to the fourth embodiment, and FIG. 27 shows an image of a process of producing a collimator module by the manufacturing method. It is.

  FIG. 28 is a diagram showing the shape of the ninth X-ray absorbing member 109 used in the seventh manufacturing method. 28, the center view is a front view when viewed in the channel direction CH, the upper view is a top view, the lower view is a bottom view, and the left view is a side view.

  As shown in FIG. 28, the ninth X-ray absorbing member 109 is configured so that both the plate surfaces of the eighth X-ray absorbing member 108 are maintained while maintaining the inclination of both the plate surfaces 108a and 108b and the shape of each groove 108m. 108 a and 108 b are extended to the X-ray focal point f side and the X-ray detector 18 side, respectively.

  That is, the ninth X-ray absorbing member 109 has a tapered plate shape as a rough shape, like the eighth X-ray absorbing member 108. Both plate surfaces 109a and 109b of the ninth X-ray absorbing member 109 have a rectangular shape having end sides parallel to the slice direction SL. In addition, as shown in FIG. 28, the ninth X-ray absorbing member 109 has the channel direction CH as the plate thickness direction, and both plate surfaces 109a and 109b of the X-ray beam from the X-ray focal point f respectively. It is inclined to form an angle Δα + Δα ′ (<Δα × 2) so as to be substantially parallel to the irradiation direction. The plate thickness at the end of the ninth X-ray absorbing member 109 on the X-ray emission side is only slightly longer than the length obtained by subtracting the plate thickness of the sixth X-ray absorbing member 106 from the width 2d of two detection elements. large.

  As shown in FIG. 28, a plurality of recesses 109 h are formed on both plate surfaces 109 a and 109 b of the ninth X-ray absorbing member 109.

  As shown in FIG. 28, each recess 109h extends along each X-ray beam XB incident on each of the eight detection elements 18i arranged in the slice direction SL from the X-ray focal point f, and has a length not penetrating. It is formed with. The space corresponding to each concave portion 109h has substantially the same shape as a part of the passage region of each X-ray beam XB, and specifically has a shape corresponding to a part of the square pan. Yes. The plate thickness at the end of the concave portion 109h on the X-ray emission side of the ninth X-ray absorption member 109 is a length obtained by subtracting the plate thickness of the sixth X-ray absorption member 106 from the width 2d of two detection elements. Is substantially the same.

  In step SG1, the taper plate 110 made of a substance containing an X-ray absorber as a main component is generated by the same method as in step SA1.

  In step SG2, both plate surfaces of the tapered plate 110 generated in step SG1 are processed to form a concave portion 109h having the same shape and size as the groove portion 108m, and the ninth X-ray absorbing member 109 is obtained.

  In step SG3, a flat plate-like sixth X-ray absorbing member 106 made of an X-ray absorber is generated.

  In step SG4, the ninth X-ray absorbing member 109 obtained in step SG2 and the sixth X-ray absorbing member 106 obtained in step SG3 are alternately stacked in the channel direction CH and bonded to each other.

  In step SG5, both end portions blocking the space corresponding to the concave portion 109h in the laminated ninth X-ray absorbing member 109 in the direction of the X-ray beam XB are removed (the shaded curved surface in step SG5 in FIG. , The image of a cutter). Thus, the collimator module 100d is completed.

  According to such a fourth embodiment, it is possible to form the lattice-like wall plate 100x that absorbs and removes scattered radiation by simply laminating only two types of X-ray absorbing members, and a collimator module. Can be produced by a simple method. In addition, it is not generated by inserting a collimator plate into the groove or bending the plate by sheet metal processing, but by stacking X-ray absorbing members, so it has high accuracy, strength and rigidity. It is advantageous. In addition, since it is basically composed of a single material, there is little expansion and contraction of the material due to changes in environmental temperature.

  Further, according to the sixth manufacturing method, the collimator module can be completed only by a process of alternately stacking only two types of X-ray absorbing members, and parts management and assembly work are extremely easy.

  In addition, according to the seventh manufacturing method, the rigidity at the time of stacking and bonding of the X-ray absorbing member can be increased, deformation and distortion of each wall plate can be suppressed, and the mechanical accuracy of the collimator module can be improved.

  Incidentally, the collimator module manufactured by the above manufacturing method is arranged and fixed in the channel direction CH on the X-ray incident surface side of the X-ray detector 18 using a predetermined member. For example, L-shaped brackets with holes are fixed to both ends of the collimator module in the slice direction SL with an adhesive, and the brackets are attached to rails extending in the channel direction CH with bolts.

  As mentioned above, although embodiment of invention was described, embodiment of invention is not limited to said embodiment, A various addition and change are possible in the range which does not deviate from the meaning of invention.

  For example, in the above embodiment, each of the plurality of regions divided by the grid-like wall plate 100x formed by the stacked X-ray absorbing members corresponds to each single detection element in the detector module 18m. As an area. However, it may be a region of a plurality of detection elements arranged in an array in at least one of the channel direction CH and the slice direction SL.

  In addition to the mechanical processing method, the generation of the X-ray absorbing member is a method in which a mixed material of an X-ray absorber powder such as molybdenum powder or tungsten powder and a predetermined resin is molded in a mold and sintered. May be used.

  In addition to the method of using an adhesive, the X-ray absorbing members may be bonded by a method of heating and pressure bonding in which heat is applied while applying pressure in a furnace.

  Further, the sixth X-ray absorbing member 106 having a flat plate shape has the channel direction CH as the plate thickness direction, and both the plate surfaces 106a and 106b are substantially the same as the irradiation direction of the X-ray beam from the X-ray focal point f. It may be a taper plate shape parallel to.

  Examples of embodiments of the invention include not only a collimator module and a manufacturing method thereof, but also an X-ray detector in which a plurality of such collimator modules are arranged, and an X-ray CT including such an X-ray detector. An apparatus is also an example of an embodiment of the invention.

DESCRIPTION OF SYMBOLS 10 X-ray CT apparatus 12 Gantry 14 X-ray tube 16 X-ray 18 X-ray detector 18m Detector module 18i Detection element 20 Collimator 22 Imaging object 24 Center of rotation 26 Control mechanism 28 X-ray controller 30 Gantry motor controller 32 Data Collection Department (DAS)
34 Image reconstruction device 36 Computer 38 Storage device 40 Console 42 Display 44 Table motor control device 46 Imaging table 48 Gantry opening 50 Device 52 Storage media 100a to 100d Collimator module 100x Grid-like wall plates 101 to 109 First to first 9 X-ray absorbing members 101m, 103m, 108m Grooves 102h, 104h, 109h Recess 105k Space 107k Opening 110 Tapered plate f X-ray focus XB X-ray beam

Claims (7)

A collimator module whose outline shape is a substantially quadrangular prism,
An arc-shaped collimator on which an X-ray fan beam is projected is formed by arranging a plurality of collimator modules adjacent to each other in the channel direction in the multi-row X-ray detector of the X-ray CT apparatus,
The collimator module is
A wall plate made of X-ray absorbing members is formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector, and is made up of a plurality of X-ray absorbing members stacked in the channel direction. ,
Each of the X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are substantially parallel to the irradiation direction of the X-ray beam, A plurality of grooves extending along the irradiation direction of the X-ray beam are formed,
In the plurality of wall plates in the slice direction, the thickness of the wall plates at both ends in the slice direction is a collimator module thicker than the thickness of the wall plates other than the both ends. A collimator module whose outline shape is a substantially quadrangular prism,
An arc-shaped collimator on which an X-ray fan beam is projected is formed by arranging a plurality of collimator modules adjacent to each other in the channel direction in the multi-row X-ray detector of the X-ray CT apparatus,
The collimator module is
A wall plate made of X-ray absorbing members is formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector, and is made up of a plurality of X-ray absorbing members stacked in the channel direction. ,
Each of the X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are substantially parallel to the irradiation direction of the X-ray beam. A plurality of grooves extending along the irradiation direction of the X-ray beam are respectively formed,
In the plurality of wall plates in the slice direction, the thickness of the wall plates at both ends in the slice direction is a collimator module thicker than the thickness of the wall plates other than the both ends. A collimator module whose outline shape is a substantially quadrangular prism,
An arc-shaped collimator on which an X-ray fan beam is projected is formed by arranging a plurality of collimator modules adjacent to each other in the channel direction in the multi-row X-ray detector of the X-ray CT apparatus,
The collimator module is
A plurality of first X-ray absorbing members in which wall plates made of X-ray absorbing members are formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector, and are alternately stacked in the channel direction. And a plurality of second X-ray absorbing members,
Each of the first X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are substantially parallel to the irradiation direction of the X-ray beam, and the X-ray beam A plurality of spaces extending along the irradiation direction are formed inside,
Each of the second X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are parallel to each other, or the plate shape,
In the plurality of wall plates in the slicing direction configured by the first X-ray absorbing member, the thickness of the wall plates at both ends in the slicing direction is greater than the thickness of the wall plates other than the both ends. A collimator module whose outline shape is a substantially quadrangular prism,
An arc-shaped collimator on which an X-ray fan beam is projected is formed by arranging a plurality of collimator modules adjacent to each other in the channel direction in the multi-row X-ray detector of the X-ray CT apparatus,
The collimator module is
A plurality of first X-ray absorbing members in which wall plates made of X-ray absorbing members are formed in a lattice shape in the channel direction and slice direction in the multi-row X-ray detector, and are alternately stacked in the channel direction. And a plurality of second X-ray absorbing members,
Each of the first X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are substantially parallel to the irradiation direction of the X-ray beam. A plurality of grooves extending along the irradiation direction of the X-ray beam are respectively formed on the surface,
Each of the second X-ray absorbing members has a plate shape in which the channel direction is a plate thickness direction, and both plate surfaces are parallel to each other, or the plate shape,
In the plurality of wall plates in the slicing direction configured by the first X-ray absorbing member, the thickness of the wall plates at both ends in the slicing direction is greater than the thickness of the wall plates other than the both ends.   The collimator module according to any one of claims 1 to 4, wherein the wall plate divides an X-ray incident surface of the multi-row X-ray detector for each detection element.   A multi-row X-ray detector in which a plurality of collimator modules according to any one of claims 1 to 5 are arranged in a channel direction on an X-ray incident surface.   An X-ray CT apparatus comprising the multi-row X-ray detector according to claim 6.

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