Patents by Inventor Go KAWATA

Go KAWATA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160349382
    Abstract: A method of manufacturing a radiation detector according to an embodiment includes: forming a plurality of scintillator array columns, each of the scintillator array columns being formed by preparing a scintillator member that a thickness being smaller than a length and a width, the scintillator member having a first face, a second face, a third face, and a fourth face, and being cut from the third face along the second direction to form at least a groove that penetrates from the first face to the second face but does not reach the fourth face to have an uncut portion near the fourth face; stacking the scintillator array columns in the first direction with a space between each of adjacent two scintillator array columns, and filling a spacer material into the space; inserting a reflector into each space and each groove; and cutting the uncut portion.
    Type: Application
    Filed: May 17, 2016
    Publication date: December 1, 2016
    Inventors: Yasuharu HOSONO, Kazunori MIYAZAKI, Go KAWATA, Mitsuyoshi KOBAYASHI, Rei HASEGAWA
  • Publication number: 20160349380
    Abstract: A pulse detection circuit according to an embodiment includes a conversion circuit, a delay circuit, first and second comparators, a latch, and a generation circuit. The conversion circuit converts an input signal into a thermometer code signal. The delay circuit outputs a delay signal being the thermometer code signal delayed by a predetermined delay time. The first comparator (The second comparator) compares the thermometer code signal with the delay signal and outputs an increase signal (a decrease signal) indicating whether the input signal is larger (smaller) than the input signal before the delay time. Based on the increase signal and the decrease signal, the latch outputs an increase-decrease signal indicating whether the input signal is increasing or decreasing. Based on the thermometer code signal and the increase-decrease signal, the generation circuit generates a pulse detection signal and a pileup detection signal.
    Type: Application
    Filed: May 26, 2016
    Publication date: December 1, 2016
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hirokatsu SHIRAHAMA, Tetsuro Itakura, Masanori Furuta, Shunsuke Kimura, Go Kawata, Hideyuki Funaki
  • Publication number: 20160282487
    Abstract: According to an embodiment, an apparatus includes a first detector, a second detector, and a controller. The first detector is configured to detect first radiation at a first frequency within a first time by at least a first radiation detecting element and a second radiation detecting element that are positioned near to each other, and output a first signal. The second detector is configured to detect second radiation at a second frequency less than the first frequency within a second time by at least the first radiation detecting element and the second radiation detecting element, and output a second signal. The controller is configured to generate a third signal representing a difference between the first signal and the second signal, and calculate energy using the third signal.
    Type: Application
    Filed: October 30, 2015
    Publication date: September 29, 2016
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Go KAWATA, Shunsuke Kimura, Yasuharu Hosono, Rei Hasegawa, Toshiyuki Ono
  • Publication number: 20160274246
    Abstract: According to an embodiment, a circuit includes a shunt and a controller. The shunt shunts input current into a plurality of current paths. The controller controls a gain of current inputted to the shunt by combining the current that is shunted into the current paths by the shunt in combination corresponding to a first signal from the outside or changing a shunt ratio with which the shunt shunts the current into the current paths corresponding to the first signal.
    Type: Application
    Filed: November 20, 2015
    Publication date: September 22, 2016
    Inventors: Shunsuke KIMURA, Hirokatsu SHIRAHAMA, Go Kawata, Masanori FURUTA, Hideyuki FUNAKI, Tetsuro ITAKURA
  • Publication number: 20160269006
    Abstract: A waveform shaping filter according to an embodiment includes at least one filter stage and a control circuit. The filter stage includes a differentiation signal generation circuit, a proportional signal generation circuit, and an adder circuit. The differentiation signal generation circuit generates a differentiation signal obtained by amplifying a differentiation component of an input signal. The proportional signal generation circuit generates a proportional signal obtained by amplifying the input signal. The adder circuit outputs an output signal obtained by adding the proportional signal and the differentiation signal. The control circuit compares the output signal and a first detection level, detects at least one of an overshoot and an undershoot of the output signal, and controls a time constant of the filter stage, based on a detection result.
    Type: Application
    Filed: February 25, 2016
    Publication date: September 15, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsuro ITAKURA, Masanori FURUTA, Shunsuke KIMURA, Hideyuki FUNAKI, Go KAWATA, Hirokatsu SHIRAHAMA
  • Publication number: 20160231441
    Abstract: According to an embodiment, a radiation detection device includes a scintillator layer, a plurality of detectors, a setting unit, an identifier, and a corrector. The scintillator layer is configured to convert radiation into scintillation light. The detectors are arranged along a first surface facing the scintillator layer to detect light. The setting unit is configured to set one of the detectors as a first detector to be corrected. The identifier is configured to identify, out of the detectors, a second detector that detects a synchronization signal synchronizing with a first signal detected by the first detector. The corrector is configured to correct an energy spectrum of light detected by the first detector on the basis of a second signal serving as the synchronization signal in signals detected by the second detector, the first signal, and characteristic X-ray energy of a scintillator raw material constituting the scintillator layer.
    Type: Application
    Filed: December 9, 2015
    Publication date: August 11, 2016
    Inventors: Keiko FUJII, Go KAWATA, Yasuharu HOSONO, Kazunori MIYAZAKI, Rei HASEGAWA
  • Patent number: 9407221
    Abstract: In one embodiment, a differential amplifier circuit includes a first input terminal, a second input terminal, a first transistor, a second transistor, a third transistor, a current source, a first output terminal, a second output terminal, a first passive element, and a second passive element. The first (second) transistor has a control terminal connected to the first (second) input terminal. The third transistor has a control terminal. The control terminal is applied predetermined bias voltage. The current source is connected to a first terminal in each of the first transistor, second transistor, and third transistor. The first (second) output terminal is connected to a second terminal of the first (second) transistor. The first (second) passive element is connected between the first (second) input terminal and the first (second) output terminal.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: August 2, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsuro Itakura, Masanori Furuta, Shunsuke Kimura, Go Kawata, Hideyuki Funaki
  • Publication number: 20160211830
    Abstract: A waveform shaping filter according to one embodiment includes a first resistor, a first transistor, a first capacitor, and a first amplifier. The first resistor includes one end to which a signal current is input and the other end. The first transistor includes a first terminal connected to the other end of the first resistor, a second terminal, and a control terminal. The first capacitor includes one end connected to the other end of the first resistor and the other end. The first amplifier includes an input terminal connected to the one end of the first resistor and an output terminal connected to the control terminal of the first transistor.
    Type: Application
    Filed: January 19, 2016
    Publication date: July 21, 2016
    Inventors: Tetsuro ITAKURA, Masanori FURUTA, Shunsuke KIMURA, Hideyuki FUNAKI, Go KAWATA, Hirokatsu SHIRAHAMA
  • Patent number: 9377540
    Abstract: A radiation detection apparatus according to an embodiment includes: a scintillator; a photon detection device array including a plurality of cells each being a photon detection device with an avalanche photodiode configured to detect visible radiation photons emitted from the scintillator and a resistor disposed along a part of a periphery of an active region of the avalanche photodiode; and a reflector configured to reflect a visible radiation photon and disposed in a region that does not include the active regions and the resistors of the cells, on a face including the active regions.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: June 28, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Go Kawata, Hideyuki Funaki, Honam Kwon, Risako Ueno, Kazuhiro Suzuki
  • Patent number: 9355283
    Abstract: An integration circuit according to one embodiment includes a first capacitance element, a capacitance circuit, a comparison circuit, a memory circuit and an operation circuit. The first capacitance element receives a current signal. The capacitance circuit includes a first switch and a second capacitance element, and is connected in parallel to the first capacitance element. The second capacitance element receives a current signal via the first switch. The comparison circuit compares a voltage of the first capacitance element with a reference voltage to obtain a comparison result. The memory circuit stores the comparison result, and opens or closes the first switch based on the comparison result. The operation circuit outputs a residual signal based on a difference between the integrated value obtained by the first capacitance element and the second capacitance element and a value based on the comparison result.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: May 31, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsuro Itakura, Masanori Furuta, Shunsuke Kimura, Hideyuki Funaki, Go Kawata
  • Patent number: 9344661
    Abstract: According to an embodiment, a photodetector includes a plurality of photoelectric transducers, a plurality of resistors, and a plurality of resetting sections. Each of the photoelectric transducers is configured to output a detection signal resulting from conversion of received light into an electric charge. Each of the resistors is connected in series with an output end of a corresponding photoelectric transducer at one end of the resistor. Each of the resetting sections is connected in parallel with a corresponding resistor and configured to bring the output end of the corresponding photoelectric transducer to a reset level in response to the detection signal.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: May 17, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuyoshi Saito, Hideyuki Funaki, Shunsuke Kimura, Shintaro Nakano, Go Kawata, Rei Hasegawa
  • Publication number: 20160084964
    Abstract: According to an embodiment, a photon detecting element includes one or more avalanche photodiodes and a circuit. The circuit is connected between cathodes of the one or more avalanche photodiodes and an external power source. The circuit is configured in which a first temperature coefficient representing variation of a setting potential with respect to temperature variation when constant-current driving is performed so that electrical potential of the cathodes becomes equal to the setting potential is substantially the same as a second temperature coefficient representing variation of breakdown voltage of the one or more avalanche photodiodes with respect to temperature variation.
    Type: Application
    Filed: September 9, 2015
    Publication date: March 24, 2016
    Inventors: Shunsuke KIMURA, Hiroshi OTA, Go KAWATA, Hideyuki FUNAKI, Rei HASEGAWA
  • Publication number: 20160045176
    Abstract: According to an embodiment, a photon counting CT apparatus includes a scintillator, a photodiode array, a holder, a divider, and an image generator. The scintillator is configured to convert X-rays into light. The array includes first and second pixels. The first pixel includes a photodiode in a first range receiving the light emitted from the scintillator. The photodiode outputs an electrical signal based on the light. The second pixel includes a photodiode in a second range different from the first range. The holder is circuitry configured to hold a value of an electrical signal output by the second pixel. The divider circuitry is configured to count the number of photons of light incident on the first pixel by dividing an integrated value of electrical signals output by the first pixel by the held value. The image generator is circuitry configured to reconstruct an image based on the counted number.
    Type: Application
    Filed: October 26, 2015
    Publication date: February 18, 2016
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Shunsuke KIMURA, Hideyuki Funaki, Go Kawata
  • Publication number: 20150349753
    Abstract: An integration circuit according to one embodiment includes a first capacitance element, a capacitance circuit, a comparison circuit, a memory circuit and an operation circuit. The first capacitance element receives a current signal. The capacitance circuit includes a first switch and a second capacitance element, and is connected in parallel to the first capacitance element. The second capacitance element receives a current signal via the first switch. The comparison circuit compares a voltage of the first capacitance element with a reference voltage to obtain a comparison result. The memory circuit stores the comparison result, and opens or closes the first switch based on the comparison result. The operation circuit outputs a residual signal based on a difference between the integrated value obtained by the first capacitance element and the second capacitance element and a value based on the comparison result.
    Type: Application
    Filed: May 22, 2015
    Publication date: December 3, 2015
    Inventors: Tetsuro ITAKURA, Masanori FURUTA, Shunsuke KIMURA, Hideyuki FUNAKI, Go KAWATA
  • Publication number: 20150296161
    Abstract: According to an embodiment, a photodetector includes a plurality of photoelectric transducers, a plurality of resistors, and a plurality of resetting sections. Each of the photoelectric transducers is configured to output a detection signal resulting from, conversion of received light into an electric charge. Each of the resistors is connected in series with an output end of a corresponding photoelectric transducer at one end of the resistor. Each of the resetting sections is connected in parallel with a corresponding resistor and configured to bring the output end of the corresponding photoelectric transducer to a reset level in response to the detection signal.
    Type: Application
    Filed: April 9, 2015
    Publication date: October 15, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuyoshi SAITO, Hideyuki FUNAKI, Shunsuke KIMURA, Shintaro NAKANO, Go KAWATA, Rei HASEGAWA
  • Patent number: 9160939
    Abstract: According to an embodiment, a signal processing device includes an integrator, a first analog-to-digital converter, and a histogram creator. The integrator is configured to integrate an electrical charge corresponding to electromagnetic waves. The first analog-to-digital converter is configured to perform an analog-to-digital conversion operation that generates digital data of the electrical charge using an integration output from the integrator, on a parallel with an integration operation performed by the integrator. The histogram creator is configured to create a histogram that represents an energy distribution of the electromagnetic waves, from the digital data generated by the first analog-to-digital converter.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: October 13, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideyuki Funaki, Shunsuke Kimura, Go Kawata, Tetsuro Itakura, Masanori Furuta
  • Publication number: 20150270840
    Abstract: A current detection circuit according to one embodiment includes a low-pass filter, a voltage-to-current converter circuit, and a comparator. The low-pass filter has a first terminal connected to a signal input terminal to which a signal current is input. The voltage-to-current converter circuit has a first terminal connected to a second terminal of the low-pass filter and has a second terminal connected to the signal input terminal. The comparator has a first input terminal and a second input terminal and outputs a signal according to a difference between a signal input through the first input terminal and a signal input through the second input terminal, the first input terminal being connected to the second terminal of the low-pass filter, and the second input terminal being connected to the second terminal of the voltage-to-current converter circuit.
    Type: Application
    Filed: March 3, 2015
    Publication date: September 24, 2015
    Inventors: Tetsuro ITAKURA, Masanori Furuta, Shunsuke Kimura, Hideyuki Funaki, Go Kawata
  • Publication number: 20150226863
    Abstract: A radiation detection apparatus according to an embodiment includes: a scintillator; a photon detection device array including a plurality of cells each being a photon detection device with an avalanche photodiode configured to detect visible radiation photons emitted from the scintillator and a resistor disposed along a part of a periphery of an active region of the avalanche photodiode; and a reflector configured to reflect a visible radiation photon and disposed in a region that does not include the active regions and the resistors of the cells, on a face including the active regions.
    Type: Application
    Filed: April 23, 2015
    Publication date: August 13, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Go KAWATA, Hideyuki Funaki, Honam Kwon, Risako Ueno, Kazuhiro Suzuki
  • Publication number: 20150160677
    Abstract: There is provided a single to differential conversion circuit including: a divider circuit, first and second bias current generators, first and second output terminals and a current generating circuit. The divider circuit receives an input current including a DC component and an AC component and divides the input current to generate a first current and a second current. The first bias current generator generates a first bias current. The first output terminal outputs a first output current depending on a difference between the first current and the first bias current. The current generating circuit generates a third current which has a sign opposite to the second current on the basis of the second current. The second bias current generator generates a second bias current. The second output terminal outputs a second output current depending on a difference between the third current and the second bias current.
    Type: Application
    Filed: December 5, 2014
    Publication date: June 11, 2015
    Inventors: Masanori FURUTA, Tetsuro Itakura, Hideyuki Funaki, Shunsuke Kimura, Go Kawata
  • Patent number: 9040927
    Abstract: A radiation detection apparatus according to an embodiment includes: a scintillator including a fluorescent material to convert radiation to visible radiation photon; a photon detection device array having a plurality of cells each of which includes a photon detection device to detect visible radiation photon emitted from a fluorescent material in the scintillator and convert the visible radiation photon to an electric signal; and a plurality of lenses provided on cells respectively in association with the cells to cause the visible radiation photon to be incident on the photon detection device in an associated cell.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: May 26, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Go Kawata, Hideyuki Funaki, Honam Kwon, Risako Ueno, Kazuhiro Suzuki