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公开(公告)号：US20190209870A1
公开(公告)日：2019-07-11
申请号：US16304701
申请日：2017-03-03
Applicant: Hitachi, Ltd.
Inventor： Yuichiro UENO , Takahiro TADOKORO , Yasushi NAGUMO , Katsunori UENO , Kouichi OKADA , Shuichi HATAKEYAMA
Abstract: A radiation therapy apparatus capable of improving the accuracy of a dose distribution includes an X-ray generation device that is provided at an arm portion of a rotation gantry, a radiation detector that is insertable into the body of a patient, a dose calculation device, and a feedback control device. An X-ray generated due to collision of an electron beam with a target in the X-ray generation device is applied to an affected part (cancer) of a patient on a bed. The radiation detector which is insertable into the body detects the X-ray applied to the affected part so as to output a photon to obtain a dose rate and a dose based thereon. The feedback control device either controls the X-ray generation device such that the obtained dose becomes a set dose or controls the radiation generation device such that the obtained dose rate becomes a set dose rate.
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公开(公告)号：US20220035055A1
公开(公告)日：2022-02-03
申请号：US17276957
申请日：2019-08-02
Applicant: HITACHI, LTD.
Inventor： Takahiro TADOKORO , Yuichiro UENO , Katsunori UENO , Kouichi OKADA , Shuichi HATAKEYAMA , Yasushi NAGUMO , Tooru SHIBUTANI , Keisuke SASAKI , Akira OOZONE
Abstract: A radiation monitor includes a radiation detection unit detecting radiation, and an optical fiber transmitting photons emitted from a light emitting element of the radiation detection unit, wherein the radiation detection unit includes a first light emitting element generating a photon in response to incident radiation, a chemical compound part having chemical compounds which generate charged particles by nuclear reactions with incident neutrons, and a second light emitting element being located between the first light emitting element and the chemical compound part and generating a photon in response to radiation.
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公开(公告)号：US20190353804A1
公开(公告)日：2019-11-21
申请号：US16474111
申请日：2018-01-30
Applicant: HITACHI, LTD.
Inventor： Shuichi HATAKEYAMA , Takahiro TADOKORO , Yuichiro UENO , Yasushi NAGUMO , Katsunori UENO , Kouichi OKADA
IPC: G01T1/20
Abstract: The present invention includes: a radiation detecting unit including a fluorescent body expressed by the formula ATaO4: B, C (in the formula, A is selected from at least one kind of element from among rare-earth elements involving 4f-4f transitions, B is selected from at least one kind of element, different from A, from among rare-earth elements involving 4f-4f transitions, and C is selected from at least one kind of element from among rare-earth elements involving 5d-4f transitions); an optical fiber that transmits photons generated by the fluorescent body; a light detector that converts the photons transmitted via the optical fiber 3 one by one into electrical pulse signals; a counter that counts the number of electrical pulse signals converted by the light detector; an analysis and display device 6 that obtains a radiation dose rate on the basis of the number of electrical pulse signals counted by the counter.
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公开(公告)号：US20220236430A1
公开(公告)日：2022-07-28
申请号：US17614410
申请日：2020-05-18
Applicant: HITACHI, LTD.
Inventor： Shuichi HATAKEYAMA , Kouichi OKADA , Katsunori UENO , Takahiro TADOKORO , Yuichiro UENO , Tooru SHIBUTANI , Keisuke SASAKI
Abstract: A radiation monitoring device realizes a high measurement function. Therefore, a radiation monitoring device includes: a radiation detection unit including a phosphor that emits light by incident radiation; a photodetector that converts a single photon or a photon group having a plurality of the single photons generated by the radiation detection unit into an electric pulse signal; and an analysis unit that analyzes the electric pulse signal. The phosphor emits light based on a plurality of light emission phenomena having different decay time constants. The analysis unit includes: a signal discrimination circuit that discriminates the electric pulse signal output from the photodetector; a dose rate calculation circuit that calculates a dose rate of the radiation based on a count rate of the discriminated electric pulse signal; and an application energy calculation circuit that calculates application energy of the radiation based on a peak value of the discriminated electric pulse signal.
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公开(公告)号：US20190204457A1
公开(公告)日：2019-07-04
申请号：US16325735
申请日：2017-08-08
Applicant: HITACHI, LTD.
Inventor： Takahiro TADOKORO , Katsunori UENO , Yuichiro UENO , Kouichi OKADA , Shuichi HATAKEYAMA , Yasushi NAGUMO , Yoshinobu SAKAKIBARA , Toru SHIBUTANI , Takahiro ITOU
CPC classification number: G01T1/208 , G01T1/20 , G01T1/2002
Abstract: Provided is a radiation monitor, including: a radiation detection unit which includes a radiation detection element, the radiation detection element emitting light of a predetermined light emission wavelength; a light emission unit which emits light of a wavelength different from the light emission wavelength; a wavelength selection unit which passes the light of the light emission wavelength, and is set to a first mode to block the light from the light emission unit; an optical transmission line which transmits the light; a light detection unit which converts the light passing through the wavelength selection unit into an electric pulse; and a control unit which measures a count rate of the electric pulse, and determines whether at least the light emission unit is degraded on the basis of the count rate and a light intensity of the light emission unit.
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Patent Agency Ranking
公开(公告)号：US20200064495A1
公开(公告)日：2020-02-27
申请号：US16415052
申请日：2019-05-17
Applicant: HITACHI, LTD.
Inventor： Shuichi HATAKEYAMA , Takahiro TADOKORO , Yuichiro UENO , Yasushi NAGUMO , Katsunori UENO , Kouichi OKADA
IPC: G01T1/20
Abstract: A radiation monitor according to the present invention includes: a radiation sensing unit which includes phosphors emitting a photon with respect to an incident radiation; and a photon sending unit which sends the photon emitted from the phosphors of the radiation sensing unit, wherein the phosphors form a multilayer structure including a first phosphor and a second phosphor, and a photon absorbing layer absorbing a photon emitted from a phosphor is provided between the first phosphor and the second phosphor.
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公开(公告)号：US20190175950A1
公开(公告)日：2019-06-13
申请号：US16307500
申请日：2016-06-28
Applicant: Hitachi, Ltd.
Inventor： Yasushi NAGUMO , Takahiro TADOKORO , Yuichiro UENO , Katsunori UENO , Kouichi OKADA , Shuichi HATAKEYAMA
Abstract: The radiation detection device includes a plurality of radiation detectors arranged in a row and is inserted into the body of patient subjected to the X-ray therapy. An X-ray detection signal (photon) is output from each of the radiation detectors that detects the X-ray applied to the patient. The dose rate measurement device separately connected to each of the radiation detectors obtains the dos rate at the position of each radiation detector based on the signals. The irradiation direction determination device determines whether the row of radiation detectors matches the irradiation direction of the X-ray using the dos rate obtained by each of the dose rate measurement devices. When the row of radiation detectors matches the irradiation direction, the energy distribution analysis device obtains an energy distribution using the dose rate at the positions of the radiation detectors by applying, for example, an inverse problem analysis called an unfolding method.
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公开(公告)号：US20190018148A1
公开(公告)日：2019-01-17
申请号：US16063707
申请日：2016-03-16
Applicant: HITACHI, LTD.
Inventor： Yuichiro UENO , Takahiro TADOKORO , Yasushi NAGUMO , Shuichi HATAKEYAMA , Kouichi OKADA
Abstract: The dose measurement device includes: a radiation sensor constituted by a light emitting portion that is made of a polycrystalline scintillator and emits light of intensity dependent on an amount of incident radiation and a cover covering the light emitting portion; an optical fiber that is connected to the radiation sensor and transmits the photons emitted by the polycrystalline scintillator; a photoelectric converter for converting the photons transmitted by the optical fiber into electrical signals; a calculation device for measuring each of the electrical signals through the conversion by the photoelectric converter of each photon, calculating a count rate, and specifying a dose rate; and a display device for displaying measurement results calculated by the calculation device.
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公开(公告)号：US20210208287A1
公开(公告)日：2021-07-08
申请号：US17059535
申请日：2019-05-16
Applicant: HITACHI, LTD.
Inventor： Shuichi HATAKEYAMA , Takahiro TADOKORO , Yuichiro UENO , Yasushi NAGUMO , Katsunori UENO , Kouichi OKADA
Abstract: A screw compressor includes a screw rotor, a casing, and a fluid supply portion to supply fluid in a membrane form into a compression chamber in the casing. The screw rotor has a male and female rotors. A male bore covering the male rotor and a female bore covering the female rotor are formed on the inner surface of the casing. An intersection line, on a higher pressure side, of the male and female bores is defined as a compression cusp. In a bore development view, a trajectory made by the first intersection of an extension line of a female lobe ridge and a male lobe ridge being moved, along with the rotation of the male and female rotors, is defined as a trajectory line. An opening of the fluid supply section to the compression chamber is positioned between the compression cusp and the trajectory line.
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公开(公告)号：US20200278458A1
公开(公告)日：2020-09-03
申请号：US16645513
申请日：2018-08-30
Applicant: HITACHI, LTD.
Inventor： Takahiro TADOKORO , Yuichiro UENO , Katsunori UENO , Kouichi OKADA , Shuichi HATAKEYAMA , Yasushi NAGUMO , Takahiro ITOU , Yoshinobu SAKAKIBARA
Abstract: Provided is a radiation monitor and the like capable of appropriately measuring radiation. A radiation monitor (100) includes: radiation detection units (11, 12); optical fibers (13p, 13q) that transmit light generated by a plurality of radiation detection elements (11a, 12a) to merge; a light detection unit (14) that converts the light after merging guided to the light detection unit into an electric pulse; a measurement device (15) that calculates a dose rate of radiation based on a count rate of the electric pulses; and an analysis/display device (16). Housings (11b, 12b) include a housing (11b) made of a first material and another housing (12b) made of a second material.
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