WO2008023431A1 - Grille et son procédé de fabrication - Google Patents

Grille et son procédé de fabrication Download PDF

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Publication number
WO2008023431A1
WO2008023431A1 PCT/JP2006/316696 JP2006316696W WO2008023431A1 WO 2008023431 A1 WO2008023431 A1 WO 2008023431A1 JP 2006316696 W JP2006316696 W JP 2006316696W WO 2008023431 A1 WO2008023431 A1 WO 2008023431A1
Authority
WO
WIPO (PCT)
Prior art keywords
ray shielding
shielding material
grid
air grid
ray
Prior art date
Application number
PCT/JP2006/316696
Other languages
English (en)
Japanese (ja)
Inventor
Hiromichi Tonami
Original Assignee
Shimadzu Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimadzu Corporation filed Critical Shimadzu Corporation
Priority to PCT/JP2006/316696 priority Critical patent/WO2008023431A1/fr
Publication of WO2008023431A1 publication Critical patent/WO2008023431A1/fr

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/30—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from X-rays

Definitions

  • the present invention relates to a grid for removing scattered radiation used in a medical radiography apparatus and the like together with a two-dimensional radiation detector and a method for manufacturing the same.
  • a two-dimensional radiation detector called a flat panel detector (FPD) has attracted attention.
  • FPD flat panel detector
  • X-ray energy is directly converted into electric charge, and this electric charge is read out as an electrical signal by a device such as TFT, and the X-ray energy is converted into light using a scintillator or the like.
  • An indirect system FPD is known in which the photoelectric conversion element converts the charge into an electric charge and the electric charge is read as an electric signal by a reading element such as a TFT.
  • the subject information collected on the two-dimensional radiation detector surface is read as spatially sampled information according to the pitch of the reading elements.
  • the scattered radiation 113 has a method of removing the scattered radiation component as much as possible by using the grid 101.
  • the grid 101 has a structure in which X-ray shielding materials 103 are arranged in a stripe at regular intervals with the intermediate substance 104 interposed therebetween. Since the scattered radiation 113 is absorbed by the X-ray shielding material 103, it does not reach the detector 102. Therefore, the SN ratio and contrast of image information can be improved. However, if secondary scattering rays 116 occur in the intermediate material, they cannot be completely removed.
  • the power with the grid ratio and the grid density is a value that represents the scattered radiation removal ability of the grid. These are determined by the thickness C and height h of the X-ray shielding material and the thickness B of the intermediate material.
  • the ratio of these is defined as SPR (Scatter Primary Ratio, the scattered radiation signal Z transmitted X-ray signal ratio), and the SPR is small! /, As a guideline that the image SN is good!
  • the X-ray shielding material 123 is formed of the upper coating material 124 and the lower coating material 125.
  • An air grid 121 having a structure that is held by bonding has been proposed (see, for example, Patent Document 1).
  • the X-ray shielding material 123 looks at the focal point F of the X-ray tube and is arranged with a pitch that matches an integer multiple of the arrangement of each pixel on the surface of the two-dimensional radiation detector 122. Yes.
  • FIG. 1 In the case of FIG.
  • the X-ray shielding material 123 is arranged at a pitch four times the arrangement of each pixel ( ⁇ shown in the figure) on the surface of the two-dimensional radiation detector 122.
  • the arrangement interval of 3 is approximately 0.6 mm, and the thickness of the X-ray shielding material is 0.03 mm.
  • the air grid 121 employs the following manufacturing method using an assembly jig 130 shown in FIG. (A) All the gauges 134 are inserted in the longitudinal direction along the groove 133 with respect to the groove plate 131 arranged opposite to the base 132. (B) The X-ray shielding material 123 is inserted into the space between the inserted gauge 134 and the gauge 134.
  • the upper covering material 124 is integrally bonded to the upper end surface of the X-ray shielding material 123, and the adhesive is cured. At this time, the height of the X-ray shielding material 123 is higher than the height of the gauge 134, and the X-ray shielding material 123 and the upper covering material 124 are bonded, but no adhesive is attached to the gauge 134.
  • D Next, the entire assembly jig 130 is turned upside down, and the auxiliary base (not shown) that is in close contact with the upper covering material 124 is fixed to the groove plate 131, and the base 132 is removed. Further, the lower covering material 125 is integrally bonded to the other surface of the X-ray shielding material 123, and the adhesive is cured.
  • the adhesive does not adhere to the force gauge 134 to which the X-ray shielding material 123 and the lower covering material 125 are bonded as in (C).
  • E Next, disassemble and remove one or both of the groove plates 131 that form part of the assembly jig 130, slide the gauge 134, and sequentially pull out one by one to form the air grid 121. .
  • F Finally, the air grid 121 is strong in strength Therefore, the spacer 126 and the spacer 127 are bonded between the edge portions of the upper covering material 124 and the lower covering material 125 to complete.
  • the air grid 121 has such a structure and manufacturing method, so it can be easily processed with high accuracy, and the intermediate material is air, so it absorbs less transmitted X-rays! / ⁇ To provide a two-dimensional radiation detector I can do it.
  • the X-ray shielding material which simply turns the intermediate substance into air, is arranged more sparsely than the conventional grid, achieving a high aperture ratio. I'm going.
  • Table 1 shows the relationship between the arrangement interval of the X-ray shielding material and the aperture ratio when the pixel pitch of the two-dimensional radiation detector is 0.15 mm.
  • Patent Document 1 Publication Number: Japanese Patent Laid-Open No. 2002-257939
  • FIG. 10 is a view showing a cross section of the air grid 121, the two-dimensional radiation detector 122, and the subject 110.
  • the focus F is at the home position, two-dimensional radiation by the X-ray shielding material 123 in the periphery is provided.
  • the size of the shadow on the projection surface to the line detector 122 is sO, which is approximately equal to the thickness of the X-ray shielding material 123.
  • the focal point F of the X-ray tube is moved on the perpendicular to the air grid 121, and the home position force of the focal point F is intentionally moved about ⁇ 100mm. May be used.
  • the focal point F is moved a distance d to the air grid 121 side.
  • the air grid 121 cannot look as far as the focal point F as much as the surrounding X-ray shielding material 123, and the X-ray shielding material height h causes scuffing, which is a large X-ray shielding material height h. It occurs more noticeably.
  • the size of the shadow on the projection surface to the two-dimensional radiation detector 2 by the peripheral X-ray shielding material 3 when the focal point F is in the position after the movement is si, which is larger than sO. This amount is much larger than the sensitivity reduction in the conventional grid and cannot be ignored.
  • the present invention adopts the following configuration.
  • the air grid according to claim 1 is inclined so that each extended surface converges to one straight line, and the height of the X-ray shielding material is highest at the center and becomes lower as it goes to the periphery.
  • a plurality of radiation shielding materials disposed on the surface, an upper covering material adhered and fixed to the radiation incident side of the plurality of radiation shielding materials, and an adhesive fixed to the side opposite to the radiation incident side of the plurality of radiation shielding materials.
  • a lower covering material disposed on the surface, an upper covering material adhered and fixed to the radiation incident side of the plurality of radiation shielding materials, and an adhesive fixed to the side opposite to the radiation incident side of the plurality of radiation shielding materials.
  • the air grid according to claim 2 is the air grid according to claim 1, wherein the projection line of the X-ray shielding material is formed on the upper surface of the two-dimensional radiation detector. It is characterized by being arranged so as to have an interval that is an integral multiple of the pixel pitch.
  • the air grid manufacturing method according to claim 3 is inclined so that each extended surface converges to one straight line, and the height of the X-ray shielding material is the highest at the center and goes to the periphery.
  • a gauge having a height corresponding to each location is inserted into a groove of an assembly jig composed of a groove plate in which a plurality of predetermined grooves are formed so as to be arranged so as to be lowered.
  • An X-ray shielding material is inserted between the upper and lower ends of the X-ray shielding material, and an upper covering material and a lower covering material are bonded and cured.
  • the grid of the present invention is inclined such that a plurality of X-ray shielding materials look at one straight line parallel to the stripe direction of the grid including the X-ray focal point, and the height of the X-ray shielding materials is centered. Highest around The structure is such that the upper covering material is adhered to the upper end portion of the X-ray shielding material, and the lower covering material is adhered to the lower end portion of the X-ray shielding material. Therefore, even when the focal point F of the X-ray tube is moved, the sensitivity can be reduced at the periphery by / J.
  • the grid of the present invention is inclined such that a plurality of X-ray shielding materials look at one straight line parallel to the grid stripe direction including the X-ray focal point, and the height of the X-ray shielding materials is Insert a gauge with a height corresponding to each location into the groove of the assembly jig consisting of a groove plate with a plurality of predetermined grooves so that the center is the highest and the height is lowered to the periphery. Then, an X-ray shielding material is inserted between the gauges, and an upper covering material and a lower covering material are bonded and cured to the upper end portion and the lower end portion of the X-ray shielding material. .
  • the air grid of the present invention is arranged so that the height of the X-ray shielding material is the highest at the center and becomes lower as it goes to the periphery, so even when the focus is moved, Is equivalent to the degree of sensitivity reduction of the conventional grid and is not a problem.
  • the air grid of the present invention since the air grid of the present invention has no intermediate substance, it can achieve a very sensitive two-dimensional radiation detector and is assembled using an assembly jig, so there is no quality variation as a finished product. Less product with high accuracy.
  • the interval between the X-ray shielding materials can be easily and accurately produced, and a detector capable of satisfactorily suppressing the occurrence of moire fringes can be obtained.
  • FIG. 1 is a diagram showing an external view of an air grid according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of an air grid according to an embodiment of the present invention.
  • FIG. 3 is a view showing an example of an air grid assembly jig according to an embodiment of the present invention.
  • FIG. 4 is a view showing a cross section of an air grid assembly process according to an embodiment of the present invention.
  • FIG. 5 is a view showing a cross section of an air grid assembling process according to an embodiment of the present invention.
  • FIG. 6 is a view showing a cross section of an air grid assembling process according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing a cross section of a conventional grid.
  • FIG. 8 is a diagram illustrating the principle of a conventional grid.
  • FIG. 9 An external view of a conventional air grid.
  • FIG. 10 A cross-sectional view of a conventional air grid.
  • FIG. 11 is a view showing an example of a conventional assembly jig. Explanation of symbols
  • Embodiment FIG. 1 is an external view of an air grid 1 of a two-dimensional radiation detector according to an embodiment of the present invention.
  • the X-ray shielding material 3 looks at the focal point F of the X-ray tube and is arranged at a pitch that matches an integer multiple of the arrangement of each pixel on the two-dimensional radiation detector 2 surface.
  • the X-ray shielding material 3 is arranged at a pitch four times the arrangement of each pixel (not shown) on the two-dimensional radiation detector 2 surface.
  • the arrangement interval of 3 is approximately 0.6 mm, and the thickness of the X-ray shielding material is 0.03 mm.
  • the height of the X-ray shielding material 3 is arranged such that the center is the highest and the height is lowered toward the periphery.
  • the height h of the X-ray shielding material changes smoothly so that the center is 5.7 mm and the end is 2.5 mm.
  • the upper covering material 4 is bonded to the upper end of the X-ray shielding material 3, and the lower covering material 5 is bonded to the lower end of the X-ray shielding material 3.
  • the entire X-ray shielding material 3 is fixed.
  • a spacer 6 and a spacer 7 are bonded between the edge portions of the upper covering material 4 and the lower covering material 5 so as to be strong in strength.
  • FIG. 2 is a view showing a cross section of the air grid 1, the two-dimensional radiation detector 2, and the subject 10.
  • the focus F is at the home position
  • the shadow size on the projection surface of the peripheral X-ray shielding material 3 on the two-dimensional radiation detector 2 is sO
  • the X-ray shielding material 3 It is equal to the thickness.
  • the focal point F of the X-ray tube is intentionally moved about ⁇ 100 mm from the home position of the focal point F on the vertical line from the focal point F to the air grid. May be used. Let us consider the case where the focal point F is moved to the air grid 1 side by a distance d.
  • the air grid 1 cannot look as far as the focal point F as much as the surrounding X-ray shielding material 3 and tends to be hurt due to the height h of the X-ray shielding material.
  • the X-ray shielding material 3 is arranged such that the height of the X-ray shielding material 3 is the highest at the center and decreases toward the periphery. Therefore, the influence of the damage is small.
  • the focal point F is in the position after movement, the size of the shadow on the projection surface to the two-dimensional radiation detector 2 by the peripheral X-ray shielding material 3 is s 1 ' This is equivalent to the degree of decrease in sensitivity of the conventional grid and is not a problem.
  • the peripheral image is not as important as the central portion, and SPR (Scatter Primary Ratio Scattered Ray Signal Z Transmitted X-ray Signal Ratio), which is a guideline for the SN of the image, is the transmission length of the subject in the peripheral portion. Is small, and the transmitted X-ray signal is large.
  • SPR Signal Primary Ratio Scattered Ray Signal Z Transmitted X-ray Signal Ratio
  • an assembling jig 20 for preparing the air lid 1 is prepared.
  • This assembly jig 20 is composed of a base 22 and a groove plate 21.
  • the groove plate 21 has a groove 23 for fitting the gauge 24 and is disposed on the base 22 so as to face each other.
  • the groove 23 has an X-ray transmitting portion, that is, a gauge 24 having a thickness corresponding to an intermediate substance, and a plurality of X-ray shielding materials 3 inserted between the gauges 24 after the force 24 has a focal point F of the X-ray tube.
  • the X-ray shielding material is arranged so that it is inclined so as to look at a single straight line parallel to the stripe direction of the grid, and so that the height of the X-ray shielding material is the highest at the center and lowers toward the periphery.
  • the height h of the X-ray shielding material 3 and the height i of the gauge 24 both change smoothly so that the center is the highest and decreases as it goes to the periphery, and the X-ray shielding inserted in the same place.
  • the relationship between the height h of material 3 and the height i of gauge 24 is always h ⁇ ⁇ i.
  • the projection line of the X-ray shielding material 3 is arranged so as to be arranged at an integer multiple of the pixel pitch of the two-dimensional radiation detector 2 on the upper surface of the two-dimensional radiation detector 2 to be finally combined. Then, it is more desirable that moire on the image does not occur.
  • Step 1 With respect to the groove plate 21 arranged on the base 22 so as to be opposed, all the gauges 24 having a height corresponding to the position along the groove 23 are inserted in the vertical direction.
  • Step 2 The X-ray shielding material 3 having a height corresponding to the place is inserted into the space between the inserted gauge 24 and the gauge 24.
  • Step 3 The upper covering material 4 is integrally bonded to the upper end surface of the X-ray shielding material 3, and the adhesive is cured. At this time, the relationship between the height h of the X-ray shielding material 3 located at the same location and the height i of the gauge 24 is always h ⁇ i, and the X-ray shielding material 3 and the upper covering material 4 are bonded. However, the adhesive does not adhere to the gauge 24.
  • the upper covering material 4 is bonded while being curved in a shape along the upper surface of the plurality of X-ray shielding materials 3.
  • Figure 4 shows a cross-sectional view of this situation.
  • Step 4 Next, the entire assembly jig 20 is turned upside down, the curved base 25 that is in close contact with the curved upper covering material 4 is fixed to the groove plate 21, and the base 22 is removed. Further, the lower covering material 5 is integrally bonded to the other surface of the X-ray shielding material 3, and the adhesive is cured. At this time, the adhesive does not adhere to the force gauge 24 to which the X-ray shielding material 3 and the lower covering material 5 are bonded as in (Step 3). The lower covering material 4 is bonded in a shape along the other surface of the plurality of X-ray shielding materials 3. In this example, since this surface is flat, the lower covering material 5 is also bonded on a flat surface. ing. A cross-sectional view of this situation is shown in Fig. 5.
  • Step 5 Next, disassemble and remove one or both of the groove plates 21 forming part of the assembly jig 20, slide the gauge 24, and pull out the air grid 1 one by one. Form. A cross-sectional view of this situation is shown in Fig. 6.
  • Step 6 Finally, in order to make the air grid 1 stronger in strength, the spacer 6 and the spacer 7 are placed between the edges of the upper covering material 4 and the lower covering material 5. Glue to complete.
  • the X-ray shielding material 3 has a large atomic number such as molybdenum, tungsten, lead, molybdenum-based alloy, tungsten-based alloy, lead-based alloy, etc. It is necessary to select a large material.
  • the X-ray shielding material thickness is set to 0.03 mm.
  • the thickness it is desirable to set the thickness appropriately between 0.02 and 0.05 mm.
  • X-rays pass through the upper covering material 4 and the lower covering material 5 and then enter the detector. Therefore, the upper covering material 4 and the lower covering material 5 have small X-ray absorption and maintain dimensional accuracy. Responding to temperature changes! Therefore, it is necessary to select a material having a stable strength with a small coefficient of thermal expansion.
  • CFRP carbon fiber reinforced plastics
  • aluminum for the upper covering material 4 and the lower covering material 5.
  • the pixel pitch of the two-dimensional radiation detector 2 is 0.115111111
  • the thickness of the line shielding material 3 is 0.03 mm
  • the X-ray shielding material 3 height: 5.7 mm

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Measurement Of Radiation (AREA)

Abstract

L'invention vise à empêcher une chute de sensibilité telle que celle qui pourrait autrement se produire par vignettage à un élément d'écran aux rayons X dans une partie périphérique, même dans le cas où un point focal (F) est déplacé. Une grille d'air est disposée de telle sorte que l'élément d'écran aux rayons X (3) est plus élevé au centre et devient plus bas à mesure qu'il s'approche de la périphérie. Cette disposition est équivalente, dans la réduction de sensibilité, à celle de la grille de l'état antérieur de la technique même si le point focal (F) est déplacé. De plus, en raison de l'absence de substance intermédiaire, la grille d'air peut permettre d'obtenir un détecteur de rayons radioactifs à deux dimensions d'une très haute sensibilité, et elle peut être assemblée au moyen d'une mâchoire d'assemblage de telle sorte qu'elle a une faible dispersion de qualité en tant que produit fini et elle est extrêmement précise en tant que produit. De plus, le détecteur peut être fabriqué simplement avec un intervalle extrêmement précis de l'élément d'écran aux rayons X, de telle sorte qu'il peut supprimer de façon satisfaisante la formation d'une frange de moiré.
PCT/JP2006/316696 2006-08-25 2006-08-25 Grille et son procédé de fabrication WO2008023431A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/316696 WO2008023431A1 (fr) 2006-08-25 2006-08-25 Grille et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/316696 WO2008023431A1 (fr) 2006-08-25 2006-08-25 Grille et son procédé de fabrication

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WO2008023431A1 true WO2008023431A1 (fr) 2008-02-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011143308A (ja) * 2011-04-28 2011-07-28 Shimadzu Corp 放射線撮影装置
JP2013034864A (ja) * 2011-08-04 2013-02-21 General Electric Co <Ge> 計算機式断層写真法（ｃｔ）撮像のための散乱低減の装置、及び該装置を製造する方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002257939A (ja) * 2001-03-06 2002-09-11 Shimadzu Corp ２次元放射線検出器とその製造方法、及びその補正方法
JP2003207575A (ja) * 2002-01-17 2003-07-25 Toshiba Corp コリメータ、ｘ線検出装置およびｘ線ｃｔ装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002257939A (ja) * 2001-03-06 2002-09-11 Shimadzu Corp ２次元放射線検出器とその製造方法、及びその補正方法
JP2003207575A (ja) * 2002-01-17 2003-07-25 Toshiba Corp コリメータ、ｘ線検出装置およびｘ線ｃｔ装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011143308A (ja) * 2011-04-28 2011-07-28 Shimadzu Corp 放射線撮影装置
JP2013034864A (ja) * 2011-08-04 2013-02-21 General Electric Co <Ge> 計算機式断層写真法（ｃｔ）撮像のための散乱低減の装置、及び該装置を製造する方法
JP2016198680A (ja) * 2011-08-04 2016-12-01 ゼネラル・エレクトリック・カンパニイ コリメータ

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