JP5260140B2 - Collimator plate mounting method, collimator plate mounting structure, radiation detection device and radiation diagnostic device - Google Patents

Description

  The present invention relates to a collimator plate mounting structure for removing scattered radiation in a radiation detection apparatus, a radiation detection apparatus, and a radiation diagnostic apparatus.

An X-ray CT apparatus, which is an example of a radiation diagnostic apparatus, detects X-rays irradiated from an X-ray tube and transmitted through a subject with an X-ray detection device, and creates a tomographic image of the subject. . The X-ray detection apparatus in such an X-ray CT apparatus is provided with a collimator plate for removing scattered X-rays generated when passing through a subject. This collimator plate is attached between a pair of arcuate holders. Specifically, the collimator plate is inserted and fixed in a groove formed on the opposing surfaces of the pair of holding bodies (see, for example, Patent Document 1).
JP 2003-207575 A

  By the way, the collimator plate removes X-rays scattered in the subject so that only the X-rays that have traveled straight through the subject are detected by the X-ray detection element among the X-rays emitted from the X-ray tube. Therefore, it is attached so that the direction parallel to the plate surface of the collimator plate faces the X-ray tube. Therefore, the groove is formed so that the collimator plate is attached in such an attachment direction.

  A plurality of collimator plates are provided in the channel direction (a direction orthogonal to the body axis direction of the subject) at a pitch corresponding to the width of the scintillator that is an X-ray detection element. Therefore, the grooves are formed so that the collimator plates are arranged at such a pitch.

  Here, since the thickness of each collimator plate and the width of each groove portion vary, a gap may be generated between the collimator plate inserted into the groove portion and the side wall of the groove portion. When the collimator plate is bonded in a state where such a gap is generated, the mounting accuracy is deteriorated.

  Therefore, in order to make the gap between the collimator plate inserted in the groove and the side wall as small as possible, a large number of the collimator plate and the holding body are prepared, and the thickness of each collimator plate and each holding body are formed. It is also conceivable to measure the width of each groove and take a method of determining a combination of the collimator plate and the groove so that the gap becomes as small as possible. However, in such a method, in order to obtain the optimum combination as much as possible, it is necessary to keep a large stock of the collimator plate and the holding body, which leads to high cost. In addition, a collimator plate or holding body for which an optimal combination cannot be found will eventually be discarded. Furthermore, even if an optimal combination is obtained, the gap cannot be completely eliminated.

  The problems to be solved by the present invention include a collimator plate mounting structure, a radiation detection device, and a radiation diagnosis that can easily and accurately mount the collimator plate regardless of variations in the thickness of the collimator plate and the width of the groove. Is to provide a device.

  This invention was made in order to solve the said subject, and the invention of the 1st viewpoint is the attachment structure of the collimator board attached to the holding body in a radiation detection apparatus, Comprising: It was formed in the said holding body The collimator plate mounting structure is characterized in that the collimator plate is inserted into a groove portion, and the collimator plate inserted into the groove portion is pressed and brought into close contact with a side wall of the groove portion by a pressing member.

  The invention of the second aspect is characterized in that, in the invention of the first aspect, the side wall of the groove portion in close contact with the collimator plate is formed along a direction in which the collimator plate is in a desired mounting direction. And a collimator plate mounting structure.

  The invention of the third aspect is the invention of the first or second aspect, wherein the holding body is formed with a plurality of the groove portions, and the plurality of collimator plates are arranged at a desired pitch. A collimator plate mounting structure in which the pitch of the grooves is set.

  The invention according to a fourth aspect is the invention according to any one of the first to third aspects, wherein a plurality of the groove portions are formed in the holding body, and the collimator plate is inserted one by one into each groove portion. The collimator plate mounting structure is characterized in that, of the opposing side walls in each of the groove portions, the side wall that closely contacts the collimator plate is on the same side.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the holding body includes a plurality of the groove portions, and the collimator plate is inserted in each groove portion by two. The collimator plate mounting structure is characterized in that each of the collimator plates is in close contact with each of the opposing side walls in each of the groove portions.

  The invention of a sixth aspect is the invention of any one of the first to fifth aspects, wherein the pressing member is inserted into the groove portion together with the collimator plate, and the width of the groove portion is the pressing member. The collimator plate mounting structure is characterized in that it is wider than the thickness of the collimator plate.

  A seventh aspect of the invention is a radiation detection apparatus having a collimator plate mounting structure according to any one of the first to sixth aspects of the invention.

  An eighth aspect of the invention is a radiation diagnostic apparatus including the radiation detection apparatus according to the seventh aspect of the invention.

  According to the first aspect of the invention, the collimator plate is attached to the holding body in a state of being pressed against and closely adhered to the side wall of the groove by the pressing member. The gap between the plates can be eliminated, and the collimator plates can be easily attached with high accuracy regardless of variations in the thickness of the collimator plates and the width of the grooves. Unlike conventional methods, there is no problem of inventory or disposal.

  According to the second aspect of the invention, since the side wall to which the collimator plate is in close contact is formed along the direction in which the collimator plate is in a desired mounting direction, the side wall is in close contact with the side wall. The collimator plate attached in (1) can be brought into a state facing a desired attachment direction.

  According to the third aspect of the invention, since the pitch of the groove portion is set so that the plurality of collimator plates are arranged at a desired pitch, the collimator plate is attached in close contact with the side wall of the groove portion. Furthermore, the pitch of the collimator plate can be set to a desired pitch.

  According to the fourth aspect of the invention, the collimator plate is attached in close contact with the same side of the opposing side walls in the groove portions.

  According to the invention of the fifth aspect, two collimator plates are attached to each groove portion in close contact with each of the opposing side walls in each groove portion.

  According to the sixth aspect of the invention, the collimator plate can be pressed against the side wall of the groove by the pressing member inserted into the groove along with the collimator plate. And since the width | variety of the said groove part is wide with respect to the thickness of the said collimator board, the said collimator board can be easily inserted in the said groove part.

  According to the seventh aspect of the invention, a radiation detection apparatus having the effects of the first to sixth aspects of the invention can be obtained.

  According to the eighth aspect of the invention, a radiation diagnostic apparatus having the effects of the seventh aspect of the invention can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the case where the present invention is applied to an X-ray detection apparatus of a radiation detection apparatus and an X-ray CT apparatus of a radiation diagnosis apparatus will be described.

(First embodiment)
First, the first embodiment will be described. 1 is a view showing an X-ray detection apparatus and an X-ray tube having a collimator plate mounting structure according to the first embodiment, FIG. 2 is a partially enlarged plan view of the X-ray detection apparatus shown in FIG. FIG. 2 is a partially enlarged perspective view of the collimator unit shown in FIG. 1.

  The X-ray detection apparatus 1 and the X-ray tube 2 are provided so as to face each other in a gantry (not shown) of an X-ray CT apparatus (the whole configuration is not shown), and are irradiated from the X-ray tube 2. X-rays are detected by the X-ray detector 1. The X-ray detection apparatus 1 includes a collimator unit 3 and a plurality of detector units 4 provided on the side opposite to the side on which the X-ray tube 2 is provided with respect to the collimator unit 3.

  The collimator unit 3 is attached between a pair of arc-shaped holding bodies 5 and 6 disposed so as to face each other in the slice direction (the body axis direction of the subject), and the pair of holding bodies 5 and 6. The collimator plate 7 is provided. The detector unit 4 includes a scintillator (not shown) that emits light when it receives X-rays, and a photodiode (not shown) that receives light emitted by the scintillator and generates a signal current. .

  A plurality of the collimator plates 7 are arranged in the channel direction. The attachment structure of the collimator plate 7 will be described in detail. A plurality of grooves 8 are formed on the opposing surfaces 5a, 6a of the holding bodies 5, 6. In this example, the groove 8 has a groove width that is about twice the thickness of the collimator plate 7. The collimator plate 7 is inserted and fixed to each groove 8 together with the pressing member 9.

  The pressing member 9 has a substantially U-shaped cross section and has elasticity. The pressing member 9 has the same length as the width of the collimator plate 7. When the pressing member 9 is inserted into the groove portion 8 together with the collimator plate 7, the elasticity of the pressing member 9 causes the side wall 8 a on one side of the side walls 8 a and 8 b in the groove portion 8 to face each other. On the other hand, the collimator plate 7 is pressed and brought into close contact.

  In the present example, the pressing member 9 is formed of an elastic material such as rubber and has a substantially U-shaped cross section. However, the present invention is not limited to this. For example, the shape of the pressing member 9 may be a substantially V-shaped cross-section or a circular cross-section, or may be a material or an elastic rod-like body formed by knitting fibers into a rod shape. The pressing member 9 may be a spiral coil having elasticity formed by winding a metal wire in a spiral shape.

  Furthermore, the pressing member 9 is not limited to one formed of an elastic material. FIG. 4 is a partially enlarged view of the collimator unit 3 having the pressing member 9 of another example. As shown in FIG. 4, the pressing member 9 is made of a hard material having a trapezoidal shape with a tapered surface 9a. It may be a columnar body. In this case, the collimator plate 7 is pressed against the side wall 8a by the pressing member 9 by pressing the pressing member 9 into the groove 8 from above and pressing the tapered surface 9a against the upper portion of the side wall 8b. Adhere closely.

  The formation direction d of the side wall 8a on one side of the groove 8 is the direction of the X-ray tube 2, and the side wall 8a is formed along the direction in which the collimator plate 7 is in a desired mounting direction. ing. As a result, the collimator plate 7 attached in close contact with the side wall 8a has a desired mounting direction, that is, a direction parallel to the plate surface of the collimator plate 7 is directed toward the X-ray tube 2. Yes. Incidentally, the side wall 8b is formed in parallel with the side wall 8a. Further, the grooves 8 are formed in a radial shape, and the collimator plates 8 are attached in a radial manner on the holding bodies 5 and 6.

  Further, the pitch p of the groove portion 8 is set to a pitch at which the collimator plate 7 is arranged at a desired pitch, that is, a pitch corresponding to the width of the scintillator in the channel direction. Here, in the present example, of the opposing side walls 8a and 8b in each of the groove portions 8, the side wall that closely contacts the collimator plate 7 is the side wall 8a and is on the same side. Therefore, the pitch p of the groove 8 is set so that the pitch of the collimator plate 7 attached in close contact with the side wall 8a is a pitch according to the width of the scintillator in the channel direction.

  In order to manufacture the collimator unit 3 having such a mounting structure of the collimator plate 7, first, at both ends in the longitudinal direction of the pair of holding bodies 5, 6, a fixing plate (shown in the drawing) is provided. The holding bodies 5 and 6 are fixed with the omission) interposed. At this time, the holding bodies 5 and 6 are fixed to each other in a state where the groove portions 8 and 8 formed on the opposing surfaces 5a and 6a of the holding bodies 5 and 6 are aligned. And the said collimator board 7 is inserted in the groove parts 8 and 8 of the said opposing surfaces 5a and 6a. At this time, since the width of the groove portion 8 is twice as large as the thickness of the collimator plate 7, the collimator plate 7 can be easily inserted.

  After the collimator plate 7 is inserted into the groove 8, the pressing member 9 is inserted. And the attachment of the collimator plate 7 is completed by bonding the collimator plate 7 in the groove portion 8 and the pressing member 9 and fixing them in the groove portion 8.

  According to the mounting structure of this example described above, the collimator plate 7 is attached to the holding bodies 5 and 6 in a state of being pressed against and closely adhered to the side wall 8a of the groove 8 by the pressing member 9. A gap between the side wall 8a to which the collimator plate 7 is closely attached and the collimator plate 7 can be eliminated, and the above-mentioned can be easily performed with high accuracy regardless of variations in the thickness of the collimator plate 7 or the width of the groove portion 8. A collimator plate 7 can be attached. And since the said side wall 8a is formed in the direction of the said X-ray tube 2, the said collimator board 7 attached in the state closely_contact | adhered to such a side wall 8a is made into the state which faced the desired direction. be able to. Further, the pitch p of the groove 8 is set so that the collimator plate 7 is arranged at a pitch corresponding to the width of the scintillator, so that the groove 8 is in close contact with the side wall 8a of the groove 8. The pitch of the collimator plate 7 attached in step 1 can be set to a desired pitch.

  Further, since the collimator plate 7 is brought into close contact with the side wall 8a by the pressing member 9 in the groove portion 8, it is not necessary to adjust the width of the groove portion 8 to the thickness of the collimator plate 7, Compared to the thickness of the collimator plate 7, the width of the groove 8 can be increased. Therefore, the collimator plate 7 can be easily inserted into the groove 8 as compared with the prior art.

(Second embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a partially enlarged perspective view showing the collimator plate mounting structure of the second embodiment.

  In the mounting structure of the present example, the groove portion 8 has a groove width that allows the two collimator plates 7 and 7 and the pressing member 9 to be inserted. Is inserted. The pressing member 9 is inserted between the collimator plates 7 and 7, and the respective collimator plates 7 are pressed and adhered to the side walls 8 a and 8 b by the elasticity of the pressing member 9. Incidentally, in this example, the shape of the pressing member 9 has a substantially C-shaped cross section.

  In this example, the formation directions d of the side walls 8a and 8b are both in the direction of the X-ray tube 2. That is, unlike the first embodiment, the side walls 8a and 8b are not parallel, but are radially formed so as to face the X-ray tube 2. Thereby, the collimator plate 7 attached in close contact with the side walls 8a and 8b is attached in a desired direction (direction of the X-ray tube 2).

  The pitch p of the groove 8 is such that the collimator plate 7 attached in close contact with each of the side walls 8a and 8b is arranged at a desired pitch (pitch corresponding to the width of the scintillator). Is set to

  The effect similar to 1st embodiment can be acquired also by the attachment structure of this example demonstrated above.

  The present invention has been described above with reference to the above embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the present invention can also be applied to radiation diagnostic apparatuses other than X-ray CT apparatuses, such as PET apparatuses and SPECT apparatuses.

It is a figure which shows the X-ray detection apparatus and X-ray tube which have the collimator board attachment structure of 1st embodiment. FIG. 2 is a partially enlarged plan view of the X-ray detection apparatus shown in FIG. 1. It is a partially expanded perspective view of the collimator unit shown in FIG. It is a partial enlarged view of the collimator unit which has a pressing member of other examples. It is a partially expanded perspective view which shows the attachment structure of the collimator board of 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 X-ray detection apparatus 5,6 Holding body 7 Collimator board 8 Groove part 8a, 8b Side wall 9 Pressing member

Claims (8)

In a method of attaching a collimator plate used for a radiation detection device to a groove provided in a pair of holding bodies that hold the collimator plate from two opposing directions,

Inserting the collimator plate into the groove of the holding part;
A step of further inserting a pressing member into the groove portion into which the collimator plate is inserted;
The collimator is configured such that the groove portion includes the collimator plate and the pressing member is inserted, and the collimator plate is pressed against and closely adhered to the side wall of the groove portion by inserting the pressing member. It has a wide width with respect to the thickness of the plate

A method of attaching a collimator plate characterized by the above. The side wall of the groove portion to which the collimator plate is in close contact is formed along a direction in which the collimator plate is in a desired mounting direction.

The collimator plate mounting method according to claim 1, wherein the collimator plate is attached. A plurality of the groove portions are formed in the holding body,
The collimator plate mounting method according to claim 1 or 2, wherein the pitch of the groove portions is set so that the plurality of collimator plates are arranged at a desired pitch. A plurality of the groove portions are formed in the holding body,
The collimator plates are inserted one by one into the respective groove portions, and of the opposing side walls in the respective groove portions, the side walls that closely contact the collimator plate are on the same side.

The collimator plate mounting method according to any one of claims 1 to 3, wherein the collimator plate is attached. A plurality of the groove portions are formed in the holding body,
Two said collimator plates are inserted into each said groove part, and each said collimator board is closely_contact | adhered to each of the opposing side wall in this each groove part.

The collimator plate mounting method according to any one of claims 1 to 3, wherein the collimator plate is attached. A collimator plate mounting structure manufactured by the collimator plate mounting method according to claim 1 .
A radiation detection apparatus comprising the collimator plate mounting structure according to claim 6 . A radiation diagnostic apparatus comprising the radiation detection apparatus according to claim 7 .

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