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公开(公告)号：US20190324161A1
公开(公告)日：2019-10-24
申请号：US16344458
申请日：2017-10-27
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA
Abstract: A radiation position detector includes a radiator including a medium that generates light in a first wavelength region and light in a second wavelength region by interacting with incident radiation, a first photodetector that includes a plurality of first two-dimensionally arranged pixels and detects the light in the first wavelength region, and a second photodetector that includes a plurality of second two-dimensionally arranged pixels and detects the light in the second wavelength region.
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公开(公告)号：US20210116586A1
公开(公告)日：2021-04-22
申请号：US16623032
申请日：2018-06-19
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA
IPC: G01T1/20 , A61B6/03 , G01T1/208 , H01L27/146
Abstract: A photodetector includes N photodetection pixels arranged one-dimensionally or two-dimensionally and each for generating a detection signal in response to incidence of light, and a single output terminal for outputting the detection signal generated in each of the N photodetection pixels. Each of the N photodetection pixels includes an avalanche photodiode operating in Geiger mode, and a quenching resistor connected in series to the avalanche photodiode, and the N photodetection pixels are configured to output detection signals having time waveforms different from each other.
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公开(公告)号：US20190243010A1
公开(公告)日：2019-08-08
申请号：US16344502
申请日：2017-10-27
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA
Abstract: A charged particle track detector includes a radiator including a medium that generates Cherenkov light by interacting with incident charged particles, a light detection unit in which a plurality of two-dimensionally arrayed pixels are disposed to correspond to a predetermined surface of the radiator, and a control unit configured to acquire position information and time information of the plurality of pixels that have detected the Cherenkov light based on a signal output from the light detection unit, and configured to obtain a track of the charged particles based on the acquired position information and the acquired time information, and a propagation locus of the Cherenkov light in the radiator.
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公开(公告)号：US20220381927A1
公开(公告)日：2022-12-01
申请号：US17747107
申请日：2022-05-18
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA , Soh UENOYAMA
IPC: G01T1/20
Abstract: A radiation detector of one embodiment includes: a scintillator configured to generate first scintillation light having a first peak wavelength and second scintillation light having a second peak wavelength in response to radiation incidence; a photodetection unit configured to detect the scintillation light generated by the scintillator; and a filter layer disposed between the scintillator and the photodetection unit and configured to selectively block the first scintillation light. The filter layer has a metasurface structure.
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公开(公告)号：US20200093448A1
公开(公告)日：2020-03-26
申请号：US16543728
申请日：2019-08-19
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Motohiro SUYAMA , Hideki SHIMOI , Ryosuke OTA , Ryoko YAMADA
Abstract: A high-energy ray detector includes a detection unit in a vacuum container. The detection unit includes a first electron multiplier, a second electron multiplier, and an electron collector. Each of the first electron multiplier and the second electron multiplier has one or more MCPs each configured to emit electrons by interaction with an incident high-energy ray (γ-ray, X-ray (in particular hard X-ray), or neutron ray), and multiply and output the electrons. The electron collector is transmissive for the high-energy ray. The electron collector is configured to collect the electrons multiplied and output from each of the first electron multiplier and the second electron multiplier, and output an electric pulse signal.
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Patent Agency Ranking
公开(公告)号：US20240027637A1
公开(公告)日：2024-01-25
申请号：US18032412
申请日：2021-09-03
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Soh UENOYAMA , Ryosuke OTA
CPC classification number: G01T1/249 , G01T1/248 , G01T1/2985 , A61B6/037
Abstract: A light detector includes a semiconductor light detection element having a plurality of light detection units disposed two-dimensionally and readout wirings and a plurality of metalenses disposed on a surface of the semiconductor light detection element. Each of the plurality of light detection units has an avalanche photodiode including a first semiconductor region and a second semiconductor region forming a PN junction with the first semiconductor region, and a quenching resistor including one end electrically connected to the second semiconductor region and another end electrically connected to the readout wiring. The plurality of metalenses are disposed two-dimensionally to overlap the plurality of light detection units, and converge light such that a convergence spot is located at a position which is within the first semiconductor region and which is separated by a predetermined distance from a boundary between the first semiconductor region and the second semiconductor region.
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公开(公告)号：US20200326438A1
公开(公告)日：2020-10-15
申请号：US16090655
申请日：2017-04-04
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA , Ryoko YAMADA , Takahiro MORIYA
IPC: G01T1/29
Abstract: A radiation position detector includes a radiator including a medium that generates Cherenkov light by interacting with an incident radiation, a photodetector including a plurality of two-dimensionally arrayed pixels, the plurality of pixels being disposed to correspond to a predetermined surface of the radiator, and a control unit that acquires position information and time information of the plurality of pixels which have detected the Cherenkov light on the basis of a signal output from the photodetector, and obtains a position of a generation place of the Cherenkov light in the radiator on the basis of the acquired position information and the acquired time information, and a propagation locus of the Cherenkov light in the radiator.
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公开(公告)号：US20190331617A1
公开(公告)日：2019-10-31
申请号：US16394032
申请日：2019-04-25
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA , Motohiro SUYAMA , Hideki SHIMOI
IPC: G01N23/095 , G01T1/24 , G01T1/22
Abstract: A gamma ray detector is a detector detecting gamma rays and includes a photomultiplier tube having an entrance window and a photoelectric surface. The entrance window is a Cherenkov radiator. The photoelectric surface is formed on a vacuum side of the entrance window via an intermediate layer. The thickness of the intermediate layer is equal to or less than the wavelength of Cherenkov light emitted by an interaction of the gamma rays with the entrance window.
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公开(公告)号：US20240366166A1
公开(公告)日：2024-11-07
申请号：US18683279
申请日：2022-08-18
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Yuya ONISHI , Ryosuke OTA , Fumio HASHIMOTO , Kibo OTE
Abstract: A tomographic image creation apparatus includes a time difference calculation unit, a signal waveform processing unit, an error estimation unit, a γ-ray pair generation position calculation unit, and an image creation unit. The time difference calculation unit calculates, for each of γ-ray pair coincidence events, a time difference of a timing at which a value of each of a first signal and a second signal output from a signal waveform acquisition unit reaches a threshold value. The signal waveform processing unit relatively shifts a waveform of the first signal or a waveform of the second signal by the time difference in a direction approaching each other. The error estimation unit estimates an error of the time difference by a DNN based on the waveform of each of the first signal and the second signal after shifting.
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公开(公告)号：US20210116585A1
公开(公告)日：2021-04-22
申请号：US16623037
申请日：2018-06-19
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Ryosuke OTA
Abstract: A radiation detection device includes a scintillator, a photodetector for detecting scintillation light from the scintillator and outputting a detection signal, a first comparator for comparing the detection signal with a first threshold voltage V1 and outputting a signal having a first time width T1, a first time width measurement device for measuring the first time width T1, a second comparator for comparing the detection signal with a second threshold voltage V2 and outputting a signal having a second time width T2, a second time width measurement device for measuring the second time width T2, and an analysis unit for obtaining a time constant τ indicating a time waveform of the detection signal based on the first and second time widths T1 and T2.
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