WO2006080206A1 - マンモグラフィー用放射線画像撮影システム及び放射線画像変換パネル - Google Patents
マンモグラフィー用放射線画像撮影システム及び放射線画像変換パネル Download PDFInfo
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- WO2006080206A1 WO2006080206A1 PCT/JP2006/300522 JP2006300522W WO2006080206A1 WO 2006080206 A1 WO2006080206 A1 WO 2006080206A1 JP 2006300522 W JP2006300522 W JP 2006300522W WO 2006080206 A1 WO2006080206 A1 WO 2006080206A1
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- Prior art keywords
- radiation image
- radiation
- conversion panel
- mammography
- image conversion
- Prior art date
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- 230000005855 radiation Effects 0.000 title claims abstract description 87
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 47
- 238000009607 mammography Methods 0.000 title claims abstract description 27
- 210000000779 thoracic wall Anatomy 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000003384 imaging method Methods 0.000 claims description 24
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 46
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- 238000007740 vapor deposition Methods 0.000 description 8
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- 229910052693 Europium Inorganic materials 0.000 description 6
- 229910052689 Holmium Inorganic materials 0.000 description 6
- 229910052779 Neodymium Inorganic materials 0.000 description 6
- 229910052771 Terbium Inorganic materials 0.000 description 6
- 229910052769 Ytterbium Inorganic materials 0.000 description 6
- 210000000481 breast Anatomy 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 206010006187 Breast cancer Diseases 0.000 description 5
- 208000026310 Breast neoplasm Diseases 0.000 description 5
- 229910052688 Gadolinium Inorganic materials 0.000 description 5
- 229910052794 bromium Inorganic materials 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
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- 238000004020 luminiscence type Methods 0.000 description 4
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- 229920005989 resin Polymers 0.000 description 4
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- 229910052712 strontium Inorganic materials 0.000 description 4
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- 229910052725 zinc Inorganic materials 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 229910052775 Thulium Inorganic materials 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
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- 229910052700 potassium Inorganic materials 0.000 description 2
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
- A61B6/502—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for diagnosis of breast, i.e. mammography
-
- 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
- G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens
Definitions
- the present invention relates to a radiographic imaging system for mammography and a radiographic image conversion panel used therefor.
- image information radiation energy corresponding to the radiation transmission density of each part of the subject
- image information radiation energy corresponding to the radiation transmission density of each part of the subject
- the image information accumulated in the photostimulable phosphor by the excitation light is emitted as photostimulated luminescence, and the intensity of the photostimulated luminescence is converted into an electrical signal, which is used for photosensitive materials, etc. It is reproduced as a visible image by an image display device such as an image recording material or CRT.
- a sheet-like photostimulable phosphor (hereinafter referred to as “stimulable phosphor sheet”) used in the radiation image recording / reproducing system described above is fixed in a predetermined support plate in a casing.
- the radiographic image reading means hereinafter referred to as “reading means”. Information is read.
- mammography is one of the inspection methods indispensable for the diagnosis of mammary gland diseases, especially breast cancer.
- the advantage is that it can detect small breast cancer.
- the X-ray dose distribution in the mammography radiography system generally decreases from the chest wall side to the anti-chest wall side. It is.
- radiographic image recording media and optical discs have S / F, CR, FPD, etc., and there is a characteristic that X-ray dose and emission luminance (and hence image output intensity) are proportional to each other. ing.
- a radiation image conversion panel has been sought that accurately corresponds to a predetermined amount of X-rays and can obtain uniform light emission brightness (see, for example, Patent Document 1). Therefore, for X-rays irradiated with a distribution from the imaging apparatus as described above, the obtained radiographic image has a luminance distribution (density distribution) reflecting the distribution.
- an image having a high density is preferable, particularly in the peripheral portion of the breast region necessary for diagnosis so as not to interfere with the diagnosis.
- the current image density is not satisfactory for diagnosis on the anti-chest wall side.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-250797
- Patent Document 2 Japanese Unexamined Patent Publication No. 2000-163562
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a breast particularly necessary for diagnosis even when the X-ray irradiation dose decreases from the chest wall side to the anti-chest wall side. Another object of the present invention is to provide a mammography radiation imaging system capable of obtaining a high-density image suitable for diagnosis at the periphery of the region, and a radiation image conversion panel suitable for use in the system.
- One aspect of the present invention for achieving the above object is a mammography radiographic imaging system for irradiating a subject with radiation and recording radiation transmission image information of the subject on a radiation image conversion panel.
- the radiation image photographing system for mammography is characterized in that the emission luminance on the side opposite to the chest wall of the radiation image conversion panel is higher than that on the chest wall side.
- FIG. 1 is a conceptual diagram of a radiation image conversion method using a radiation image detection medium (radiation image conversion panel).
- FIG. 2 is a schematic configuration diagram of a radiographic imaging system for mammography.
- FIG. 3 Distribution diagram of X-ray intensity (X-ray dose) reaching the subject.
- FIG. 4 A diagram schematically showing a situation in which X-rays with a distribution in X-ray dose are irradiated and imaged.
- FIG. 5 (a) is a view showing the shape of a coating liquid outlet cross-section of a slide hopper having different opening sizes in the width direction. (B) is a figure which shows the shape of the coating liquid outflow port cross-section of a slide hopper with a fixed opening part size in the width direction.
- FIG. 6 (a) is a cross-sectional view of a photostimulable phosphor layer having a different thickness in the width direction applied on a support.
- (b) is a cross-sectional view of a photostimulable phosphor layer having a constant thickness in the width direction applied on a support.
- FIG. 7 is a diagram for explaining a method of gradually increasing the surface area of the vapor deposition source in the width direction and changing the amount deposited on the support.
- FIG. 8 is a diagram for explaining a method of applying a stimulable phosphor coating solution in which the coating solution outlet of the slide hopper is divided into several parts and the emission luminance changes in the width direction.
- a radiographic imaging system for mammography that irradiates a subject with radiation and records radiation transmission image information of the subject on a radiation image conversion panel
- the emission brightness on the side opposite to the chest wall of the radiation image conversion panel is the chest wall.
- a radiographic imaging system for mammography characterized in that it is higher than the side.
- a clear X-ray image that is easy to diagnose can be obtained unless the amount of stimulated luminescence is increased in comparison with the amount of X-ray irradiation in a region irradiated with an X-ray dose smaller than it should be.
- I ca n’t In other words, in radiographic imaging for mammography, the non-image area density is almost constant for the first time by making the emission luminance on the side opposite to the chest wall of the radiation image conversion panel higher than that on the chest wall side. X-ray images that are easy to handle are obtained.
- the representative method is a method of performing radiation display on a subject by irradiating the subject with radiation using an stimulable phosphor as a radiation image detection medium.
- a radiation transmission image is formed through the following steps.
- FIG. 1 conceptually shows a radiation image conversion method using the radiation image detection medium (also referred to as a radiation image conversion panel) of the present invention.
- FIG. 1, 2 is a radiation generator
- 3 is a subject (indicated by a human body)
- 5 is a radiation image detection medium according to the present invention
- 24 is a stimulating excitation light source (such as a laser), irradiation
- the photoelectric conversion device 25 that detects the stimulated fluorescence emitted from the radiation image detection medium 5 by the stimulated excitation light 5, the device 26 that reproduces the signal detected by the 25 as an image, and displays the reproduced image
- a filter 28 that separates stimulated excitation light and stimulated fluorescence and transmits only the stimulated fluorescence.
- the number after 25 is not limited to the above as long as optical information from the radiation image detection medium 5 can be reproduced as an image in some form.
- the radiation (R) from the radiation generator 2 enters the radiation image detection medium 5 through the subject 3 (RI).
- the incident radiation is absorbed by the stimulating layer of the radiation image detection medium 5, the energy is accumulated, and an accumulated image of a radiation transmission image is formed.
- this accumulated image is excited by stimulated excitation light from the stimulated excitation light source 24 and emitted as stimulated emission.
- this optical signal is photoelectrically converted by a photoelectric conversion device 25 such as a photomultiplier tube, and an image is generated by an image generation device 26. As a result, the radiographic image of the subject can be observed.
- the tube voltage of the radiation generator 2 is generally 20 to 35 kV, which is lower than that of chest imaging.
- FIG. 2 shows the configuration of a radiographic imaging system for mammography according to the present invention.
- Reference numeral 1 denotes a mammography radiographic image capturing apparatus, which captures an object 3 with X-rays generated from the radiation generating apparatus 2.
- subject 3 was photographed in a compressed state by a compression plate 4 on a photographing table 7 on which a radiation image detection medium (radiation image conversion panel) 5 such as a stimulable phosphor was installed.
- a radiation image detection medium (radiation image conversion panel) 5 such as a stimulable phosphor was installed.
- the X-rays generated by the radiation generator 2 are originally radial and reach the subject 3, but the chest wall side (the large shaded area in Fig. 2) is cut to prevent adverse effects on the human body and image quality degradation. Usually there is.
- the X-ray intensity (X-ray dose) reaching the subject 3 has a distribution as shown in FIG. 3, and is small on the side opposite to the chest wall, which is large on the chest wall side. Therefore, an image affected by the radiation image conversion panel 5 is recorded.
- Figure 4 shows the effect and the results corrected by the present invention.
- Fig. 3 schematically shows the situation in which X-rays with a distribution in the X-ray dose are projected onto the subject 3 and photographed (upper diagram) ) And a diagram (lower diagram) schematically showing the distribution of luminance obtained when light is emitted after recording on a radiation image conversion panel with uniform sensitivity.
- Fig. 4 (b) shows the result of actual X-ray imaging.
- the X-ray image finally obtained is the X-ray dose on the chest wall side, especially when there is no luminance distribution on the radiation image conversion panel. Since the density is large, the density decreases on the side opposite the chest wall where the density is high.
- the lower diagram of FIG. As shown in FIG. 5, a uniform image as a whole can be obtained, and diagnostic accuracy can be improved.
- Radiological image detection medium radiological image conversion panel
- the radiographic image detection medium that can be preferably used in the present invention usually has a support, a stimulable phosphor layer and a protective layer formed on the support, and a bright image is formed between the support and the protective layer.
- This is a radiation image conversion panel which is sealed with a sealing agent or a spacer and a sealing agent surrounding the peripheral portion of the stimulable phosphor.
- the radiation image conversion panel of the present invention has different emission luminances on the chest wall side and the non-chest wall side, but there are several methods for producing the same, and it should not be particularly limited.
- a typical example is a method of changing the thickness of the photostimulable phosphor layer.
- a photostimulable phosphor layer is coated on a support with a slide hopper, and the shape of the coating liquid outlet 11 of the slide hopper is changed to a width as shown in Fig. 5 (a) in order to change the coating amount in the width direction.
- Use the one with the opening size changed in the direction usually the opening size is constant in the width direction as shown in Fig. 5 (b)).
- the photostimulable phosphor layer 13 coated on the support 12 can be changed in thickness depending on the position in the width direction as shown in FIG. 6 (a) (usually as shown in FIG. 6 (b)).
- the film thickness is constant in the width direction).
- the surface area of the vapor deposition source 14 is gradually increased so that the film thickness gradually increases in the width direction, and vapor deposition is performed on the support per unit area.
- the amount can be changed.
- the thickness of the photostimulable phosphor layer can also be changed by changing the distance between the deposition source and the support.
- the liquid emission outlet 11 of the slide hopper is divided into several parts such as l la, l ib, l lc and 1 Id in FIG.
- the stimulable phosphor coating solution is applied.
- the vapor deposition method it can be produced by arranging the vapor deposition source 14 and forming the photostimulable phosphor layer so that the emitted luminance gradually changes when the photostimulable phosphor layer is formed.
- the coating type is a general formula aBaX-(l -a) BaY: bEu 2+ (formula described in JP-A-2-58593) Middle, X, Y are
- MIX 'aMIIX' -bMIIIX "described in JP-A-61-72087: cA (where MI is Li, Na, K, Rb,
- ⁇ represents at least one divalent metal of Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu, Ni, ⁇ represents Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga, In represent at least one trivalent metal, X, X ' , X "represents at least one halogen of F, Cl, Br, I, A is Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Represents at least one metal of Y, Tl, Na, Ag, Cu, Mg, a, b, c are 0 ⁇ a ⁇ 0.5, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.2
- An alkali hydroxide stimulable phosphor represented by the general formula (Ba (MI)) FX: yA
- MIFX'xA (MI is at least one of Mg, Ca, Ba, Sr, Zn, and Cd described in JP-A-55-160078)
- A represents BeO, MgO, CaO, SrO, BaO, ZnO, AlO, YO, LaO, In
- Ln represents at least one of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Sm, and Gd
- X represents at least one of Cl, Br, and I
- x , y is 5 X 10- 5 ⁇ x ⁇ 0. 5, 0 ⁇ stimulable phosphor represented by represents a number) that satisfies y ⁇ 0. 2 and the like.
- the vapor deposition type is a general formula MlX ′ aM2X ′ -bM3X ”described in JP-A-2004-205354.
- EA (Ml is at least one alkali metal selected from the group force consisting of Li, Na, K, Rb and Cs, and M2 consists of Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu and Ni Group force is at least one divalent metal selected, M3 is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, At least one trivalent metal selected from the group consisting of Al, Ga and In, and X, X ′ and X ′ ′ are selected from the group consisting of F, Cl, Br and I.
- A is Eu, Tb, In, Ga, Cs, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag A, b, e are 0 ⁇ a ⁇ 0.5, 0 ⁇ b ⁇ 0.5, and 0 ⁇ e ⁇ 0.2, respectively.
- Fig. 5 Using a slide hopper having the coating solution outlet 11 in the shape of (a) and (b), the coating solution of the photostimulable phosphor CsBr: Eu is applied on the support and dried.
- a stimulable phosphor plate having the cross-sectional shapes of a) and (b) was prepared, each having a resin protective layer, and sealing surrounding the periphery of the stimulable phosphor between the support and the protective layer
- the radiation image conversion panels 1 and 2 were prepared and sealed.
- the coating solution of the photostimulable phosphor BaFI: Eu was applied onto the support and dried.
- 6 Prepare stimulable phosphor plates having the cross-sectional shapes of (a) and (b), each having a protective layer of resin, and surrounding the periphery of the stimulable phosphor between the support and the protective layer. Sealed radiation image conversion panels 3 and 4 were prepared with a sealant.
- a stimulable phosphor (CsBr: l.OEu) coating liquid with high emission luminance is applied from the coating liquid outlet 11a.
- a low emission luminance stimulable phosphor (CsBr: 0.8 Eu) coating solution is applied, and from the coating solution outlet 11 b, a high emission luminance stimulable phosphor coating solution is 0.65, Stimulable phosphor with low emission luminance (CsBr: 0.8Eu) mixed at a ratio of 0.35, and further, a stimulable phosphor with high emission luminance is applied from the coating solution outlet 11c.
- the solution was mixed with 0.35 and a low emission luminance stimulable phosphor (CsBr: 0.8Eu) coating solution at a ratio of 0.65. It was applied on the carrier. Using this, a sealing radiation image conversion panel 5 having a resin protective layer and having a sealing agent surrounding the periphery of the stimulable phosphor between the support and the protective layer was prepared.
- a low emission luminance stimulable phosphor CsBr: 0.8Eu
- the stimulating phosphor (BaFI: l. OEu) having a high emission luminance is applied from the coating solution outlet 1 la.
- a stimulable phosphor (BaFI: 0.8Eu) coating solution with low emission brightness is applied, and the coating solution outlet l ib force is 0.665 of the stimulable phosphor coating solution with high emission brightness
- a mixture of low emission luminance stimulable phosphor (CsBr: 0.8Eu) coating solution at a ratio of 0.35, and the coating solution outlet 11c force is high emission luminance stimulable phosphor coating solution 0.35 and a low emission luminance stimulable phosphor (CsBr: 0.8Eu) coating solution mixed at a ratio of 0.65 were each applied to the support by allowing an equal amount of solution to flow out.
- a sealed radiation image conversion panel 6 having a resin protective layer and having a sealing agent surrounding the periphery of
- Radiation image conversion panel 7 was produced in the same manner as radiation image conversion panel 1 except that the stimulable phosphor (CsBr: Eu) was deposited by changing the surface area of the evaporation source as shown in FIG.
- a radiation image conversion panel 8 was produced in the same manner as the radiation image conversion panel 7 except that the surface area of the vapor deposition source was made uniform.
- X-ray images were prepared at a tube voltage of the radiation generator of 30 kV, and the image densities at the chest wall and non-chest wall were compared.
- the radiation image conversion panels 1, 3, 5, 6 and 7 within the scope of the present invention have a uniform luminance with respect to the non-image part, and a luminance difference from the lowest luminance when the highest luminance is 1. Was within 0.2.
- the radiation image conversion panels 2, 4 and 8 outside the scope of the present invention have non-uniform light emission luminance in the non-image area, and when the maximum light emission luminance is 1, the luminance difference from the minimum light emission luminance is 0. Greater than 2. For this reason, the outline of the breast on the non-chest wall was able to obtain only a ray X-ray image that could be clearly distinguished from the non-image area.
- a high-density image suitable for diagnosis can be obtained, especially in the peripheral part of the breast area necessary for diagnosis.
- a radiographic imaging system for mammography and a radiation image conversion panel suitable for use in the system can be provided.
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- High Energy & Nuclear Physics (AREA)
- Medical Informatics (AREA)
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- Molecular Biology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Dentistry (AREA)
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- Veterinary Medicine (AREA)
- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2007500463A JPWO2006080206A1 (ja) | 2005-01-26 | 2006-01-17 | マンモグラフィー用放射線画像撮影システム及び放射線画像変換パネル |
Applications Claiming Priority (2)
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JP2005-017887 | 2005-01-26 | ||
JP2005017887 | 2005-01-26 |
Publications (1)
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WO2006080206A1 true WO2006080206A1 (ja) | 2006-08-03 |
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PCT/JP2006/300522 WO2006080206A1 (ja) | 2005-01-26 | 2006-01-17 | マンモグラフィー用放射線画像撮影システム及び放射線画像変換パネル |
Country Status (4)
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US (1) | US20080130830A1 (ja) |
JP (1) | JPWO2006080206A1 (ja) |
CN (1) | CN101106943A (ja) |
WO (1) | WO2006080206A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008086383A (ja) * | 2006-09-29 | 2008-04-17 | Fujifilm Corp | 乳房放射線画像撮影装置および乳房放射線画像撮影方法 |
JP2012107960A (ja) * | 2010-11-16 | 2012-06-07 | Canon Inc | シンチレータ、放射線検出装置および放射線撮影装置 |
Citations (2)
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JP2000163562A (ja) * | 1998-11-30 | 2000-06-16 | Canon Inc | 特徴量抽出装置、方法及びコンピュータ読み取り可能な記憶媒体 |
JP2002250797A (ja) * | 2001-02-26 | 2002-09-06 | Konica Corp | 放射線画像変換パネル及びその製造方法 |
Family Cites Families (1)
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JPS60174999A (ja) * | 1984-02-22 | 1985-09-09 | 化成オプトニクス株式会社 | 感度補償増感紙及びその製法 |
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2006
- 2006-01-17 CN CNA2006800029253A patent/CN101106943A/zh active Pending
- 2006-01-17 WO PCT/JP2006/300522 patent/WO2006080206A1/ja not_active Application Discontinuation
- 2006-01-17 JP JP2007500463A patent/JPWO2006080206A1/ja active Pending
- 2006-01-17 US US11/795,481 patent/US20080130830A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000163562A (ja) * | 1998-11-30 | 2000-06-16 | Canon Inc | 特徴量抽出装置、方法及びコンピュータ読み取り可能な記憶媒体 |
JP2002250797A (ja) * | 2001-02-26 | 2002-09-06 | Konica Corp | 放射線画像変換パネル及びその製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008086383A (ja) * | 2006-09-29 | 2008-04-17 | Fujifilm Corp | 乳房放射線画像撮影装置および乳房放射線画像撮影方法 |
JP2012107960A (ja) * | 2010-11-16 | 2012-06-07 | Canon Inc | シンチレータ、放射線検出装置および放射線撮影装置 |
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CN101106943A (zh) | 2008-01-16 |
US20080130830A1 (en) | 2008-06-05 |
JPWO2006080206A1 (ja) | 2008-06-19 |
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