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公开(公告)号：GB2230927A
公开(公告)日：1990-10-31
申请号：GB9001321
申请日：1990-01-19
Applicant: HAMAMATSU PHOTONICS KK
Inventor： YAMASHITA TAKAJI , WANATABE MITSUO , OKADA HIROYUKI , SHIMIZU KEIJI
Abstract: A data correcting device is intended to be used with a CT apparatus for obtaining a tomographic image with a subject holding means being adapted to be slidable into or out of the tunnel in a gantry. The device includes a body movement sensor for detecting a movement of a subject under examination; a body movement data processing unit for converting body movement data from the body movement sensor into address correcting data; a tomographic data processing unit for processing tomographic data obtained in the gantry; an address converting unit for correcting the address of the tomographic data with the address correcting data; and a memory for storing data.
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公开(公告)号：GB2198620A
公开(公告)日：1988-06-15
申请号：GB8721895
申请日：1987-09-17
Applicant: HAMAMATSU PHOTONICS KK , RESEARCH DEV CORP
Inventor： YAMASHITA TAKAJI , UCHIDA HIROSHI , SHIMIZU KEIJI , OMURA TOMOHIDE
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公开(公告)号：AU5882001A
公开(公告)日：2001-12-03
申请号：AU5882001
申请日：2001-05-23
Applicant: HAMAMATSU PHOTONICS KK
Inventor： TANAKA EIICHI , YAMASHITA TAKAJI
Abstract: A PET apparatus is provided, which ensures excellent quantitativeness by properly correcting the influence of scattered radiation while improving the resolution of a reconstructed image and keeping good photon pair detection sensitivity. A determining section 52 determines whether a straight line connecting the light-receiving surfaces 15b of a pair of photon detectors 15a which have simultaneously detected a photon pair crosses any one of slice collimators 21n. When it is determined that the straight line crosses none of the slice collimators 21n, the corresponding coincidence counting information is accumulated by a first coincidence counting information storage section 53 to generate a signal sinogram. When it is determined that the straight line crosses one of the slice collimators 21n, the corresponding coincidence counting information is accumulated by a second coincidence counting information storage section 54 to generate a scatter sinogram. An image reconstructing section 60 corrects the influence of scattered components on the signal sinogram on the basis of the scattered sinogram, and reconstructs an image on the basis of the corrected signal sinogram.
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公开(公告)号：AU5880501A
公开(公告)日：2001-12-03
申请号：AU5880501
申请日：2001-05-22
Applicant: HAMAMATSU PHOTONICS KK
Inventor： YAMASHITA TAKAJI , OKADA HIROYUKI
Abstract: A PET apparatus (1) includes a detecting section (10). Each cylindrical detector (13n) of the detecting section (10) has a plurality of block detectors (141 to 14M) arranged on the same circumference on a place perpendicular to a central axis (CAX) in the form of a ring. Each block detector (14m) is a two-dimensional position detector which detects the two-dimensional incident position of a photon incident on a light-receiving surface 15b. Each slice collimator (21n) extends to a rear portion of a corresponding one of cylindrical detectors (13n) through the space between adjacent cylindrical detectors (13n) and (13n+1) and is integrally fixed by a holding plate (22) at the rear portion.
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公开(公告)号：GB2231474B
公开(公告)日：1992-12-09
申请号：GB8909158
申请日：1989-04-21
Applicant: HAMAMATSU PHOTONICS KK
Inventor： YAMASHITA TAKAJI , SHIMIZU KEIJI
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Patent Agency Ranking
公开(公告)号：GB2230927B
公开(公告)日：1992-10-28
申请号：GB9001321
申请日：1990-01-19
Applicant: HAMAMATSU PHOTONICS KK
Inventor： YAMASHITA TAKAJI , WANATABE MITSUO , OKADA HIROYUKI , SHIMIZU KEIJI
Abstract: A data correcting device is intended to be used with a CT apparatus for obtaining a tomographic image with a subject holding means being adapted to be slidable into or out of the tunnel in a gantry. The device includes a body movement sensor for detecting a movement of a subject under examination; a body movement data processing unit for converting body movement data from the body movement sensor into address correcting data; a tomographic data processing unit for processing tomographic data obtained in the gantry; an address converting unit for correcting the address of the tomographic data with the address correcting data; and a memory for storing data.
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公开(公告)号：AU1307301A
公开(公告)日：2001-05-30
申请号：AU1307301
申请日：2000-11-10
Applicant: HAMAMATSU PHOTONICS KK
Inventor： UCHIDA HIROSHI , YAMASHITA TAKAJI
Abstract: A first detector group 1 and a second detector group 2, disposed opposite to each other and detecting gamma ray pairs resulting from electron-positron pair annihilation, are each constituted by two two-dimensional radiation detectors 101, and 102, 201, and 202, and arranged so that a prescribed arrangement spacing L2 is established between the scintillator arrays 11 and 21. Furthermore, the coincidence counting circuit 50 of the signal processing circuit 5 is constituted so as to carry out coincidence counting for diagonally disposed detectors as well as oppositely disposed detectors. Accordingly, the are a between the ranges of the fields of view resulting from opposite detectors is supplemented by a range of the field of view resulting from diagonally disposed detectors. Consequently, it becomes possible to attain a positron imaging device wherein the range of the field of view is efficiently expanded, and the simplification and cost reduction of the device are realized.
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公开(公告)号：DE69414429T2
公开(公告)日：1999-04-08
申请号：DE69414429
申请日：1994-01-18
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OKADA HIROYUKI , YAMASHITA TAKAJI
Abstract: A scintillation counter (1) that can accurately measure the intensity of beta ray radiation comprises two scintillation fibers (11 and 12) which emit light of different wavelengths and which are provided in series as a probe (10). One of the scintillation fibers (12) is covered with a beta -ray shield (13). The optical signal generated at the probe (10) is transmitted through an optical fiber (20) and separated by a light separating element (31) into components of different wavelength ( lambda 1 and lambda 2). One portion of the separated optical signal ( lambda 1) is incident on a light detector (32) and the intensity of the incident light detected. The other portion of the separated optical signal ( lambda 2) is incident on a light detector (33) and the intensity of the incident light detected. The intensity of the beta radiation is obtained by subtracting the output of detector (33) from that of detector (32) to give an output that is corrected for gamma radiation.
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公开(公告)号：DE69414429D1
公开(公告)日：1998-12-17
申请号：DE69414429
申请日：1994-01-18
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OKADA HIROYUKI , YAMASHITA TAKAJI
Abstract: A scintillation counter (1) that can accurately measure the intensity of beta ray radiation comprises two scintillation fibers (11 and 12) which emit light of different wavelengths and which are provided in series as a probe (10). One of the scintillation fibers (12) is covered with a beta -ray shield (13). The optical signal generated at the probe (10) is transmitted through an optical fiber (20) and separated by a light separating element (31) into components of different wavelength ( lambda 1 and lambda 2). One portion of the separated optical signal ( lambda 1) is incident on a light detector (32) and the intensity of the incident light detected. The other portion of the separated optical signal ( lambda 2) is incident on a light detector (33) and the intensity of the incident light detected. The intensity of the beta radiation is obtained by subtracting the output of detector (33) from that of detector (32) to give an output that is corrected for gamma radiation.
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公开(公告)号：GB2216760B
公开(公告)日：1992-01-08
申请号：GB8905290
申请日：1989-03-08
Applicant: HAMAMATSU PHOTONICS KK , JAPAN RES DEV CORP
Inventor： YAMASHITA TAKAJI , UCHIDA HIROSHI
Abstract: A position-sensitive radiation detector has a multi-layer scintillator assembly coupled to a position-sensitive photo-detector. Individual scintillator blocks of rectangular solid form in each scintillator layer are optically isolated by a reflecting agent such as BaSO4, and the adjacent layers are optically coupled by a coupling agent such as silicon grease. In the case of the scintillator assembly of n layers, the scintillator blocks in one layer are staggered with those in the adjacent layer by one nth of the width of each block. In addition to information on a horizontal position, information on the depth of radiation absorption can be obtained by calculating the centroid or variance of a spatial distribution of light outputted from the scintillator assembly.
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