Hamamatsu-photonics K.k.

Kyoto University

Micromass UK Limited

Other

University of California

Tokyo Electron Limited

Keio University

Motohiro Suyama

Suenori Kimura

Hiroshi Kobayashi

Tetsuo Kobayashi

Yoshihiko Kawai

Takahiro Moriya

Atsuhito Fukasawa

Akinori Saito

Takenori Oida

Tetsuya Morita

Yasuyuki Egawa

Masaharu Muramatsu

Yasuharu Negi

Hiroyuki Kyushima

Norio Asakura

Takayuki Ohmura

Akihiro Kageyama

Shinya Hattori

Atsushi Uchiyama

Masahiro Kotani

Yutaka Hasegawa

Akio Suzuki

Etsuo Iizuka

Ken Hirano

Hideki Shimoi

John Brian Hoyes

Hisanori Suzuki

Koei Yamamoto

Katsuyuki Kinoshita

Anthony James Gilbert

Kentaro Maeta

Tadashi Maruno

Fumio Iwase

Takaaki Nagata

Koichiro Oba

Ryosuke Ota

Akiomi Ujima

Toshimitsu Nagai

Norihisa Kato

Takeo Fujii

Tetsuya Saito

Katsuya Okumura

Masuo Ito

Tsuneyuki Urakami

Kimitsugu Nakamura

Atsushi Ishii

Taku Yamada

Hitoshi Kishita

Yoshitaka Ishikawa

Tomohiro Ishizu

Toshiyuki Uchiyama

Hiroyuki Taketomi

Peter Uhd Jepsen

Hideyuki Maki

Masahiko Iguchi

Simon Lehnskov Lange

Makoto Oishi

Ryoko Yamada

Katsuji Kadosawa

Atsushi Kibune

Shigeru Ichikawa

Kota Iwasaki

Wataru Matsudaira

Tomohiko Hirano

Tomofumi Kiyomoto

Katsushi Arisaka

Hanguo Wang

Yasuhara Negi

Shogo Ema

Naotaka Hakamata

A brain measurement apparatus includes: a static magnetic field forming unit for forming a static magnetic field in a measurement area; a gradient magnetic field coil for forming a gradient magnetic field in the measurement area; a transmission coil for transmitting a transmission pulse toward a subject in the measurement area; a detection coil for detecting a nuclear magnetic resonance signal generated in the subject by transmission of the transmission pulse; and a generator for generating an MR image based on the nuclear magnetic resonance signal detected by the detection coil.

Brain measurement apparatus

A brain measurement apparatus configured to generate an MR image and a brain's magnetic field distribution of a subject includes: an MRI module having a transmission coil configured to transmit a transmission pulse toward the subject and a detection coil configured to detect a nuclear magnetic resonance signal generated in the subject by the transmission pulse; an optically pumped magnetometer configured to detect a brain's magnetic field of the subject; a generator configured to generate the MR image based on the nuclear magnetic resonance signal detected by the detection coil and generating the brain's magnetic field distribution based on the brain's magnetic field detected by the optically pumped magnetometer; a marker displayed on the MR image generated by the generator; and a helmet-type frame to which the detection coil, the optically pumped magnetometer, and the marker are attached and which is attached to a head of the subject.

Brain measurement apparatus and brain measurement method

This invention concerns a photo-cathode for a vacuum system, wherein the photo-cathode is configured for receiving electromagnetic radiation having an incoming wavelength and for emitting electrons in response thereto. The photo-cathode comprises a conducting structure having a geometry, the geometry comprising a tip section. The tip section is adapted to provide field enhancement, β, when the conducting structure is illuminated with the electromagnetic radiation, wherein β is greater than about 10. The photo-cathode further comprising a substrate, the substrate being or comprising a dielectric substrate, the substrate supporting the conducting structure.

Photo-cathode for a vacuum system

A photoelectric-surface electron source includes: a glass substrate that receives laser light from a substrate light-receiving surface including microlenses and that focuses the laser light toward a substrate main surface located on the opposite side from the substrate light-receiving surface; a photoelectric surface that is provided to the substrate main surface, and that receives the focused laser light and emits photoelectrons; and an extraction electrode that is fixed to the substrate main surface and that extracts the photoelectrons from the photoelectric surface. The extraction electrode is disposed away from the photoelectric surface along the normal direction of the substrate main surface and has: an electrode part in which electrode holes for allowing the photoelectrons to pass therethrough are provided; and a frame part that is fixed to a region surrounding the photoelectric surface in the substrate main surface.

Photoelectric-surface electron source

A brain measurement apparatus includes: a magnetoencephalograph including optically pumped magnetometers, magnetic sensors for measuring geomagnetic field at positions of the optically pumped magnetometers, magnetic sensors for measuring a fluctuating magnetic field at the positions of the optically pumped magnetometers, nulling coils for cancelling the geomagnetic field, and an active shield coil for cancelling the fluctuating magnetic field; an MRI apparatus including nulling coils for applying a static magnetic field and a gradient magnetic field, a transmission coil, and a receive coil; and a control device that, when measuring a brain's magnetic field, controls currents supplied to the nulling coils and the active shield coil based on measured values of the magnetic sensors and, when measuring an MR image, controls the static magnetic field and the gradient magnetic field by controlling currents supplied to the nulling coils and generates an MR image from an output of the receive coil.

A brain measurement apparatus includes: a magnetoencephalograph including optically pumped magnetometers, magnetic sensors for measuring a static magnetic field at positions of the optically pumped magnetometers, and a nulling coil for canceling the static magnetic field; an MRI apparatus including a permanent magnet, a gradient magnetic field coil, a transmission coil, and a receive coil for detecting a nuclear magnetic resonance signal; and a control device that, when measuring the brain's magnetic field, controls a current to be supplied to the nulling coil based on measured values of the magnetic sensors and operates so as to cancel a static magnetic field at the position of each of the optically pumped magnetometers and, when measuring an MR image, controls the gradient magnetic field by controlling a current to be supplied to the gradient magnetic field coil and generates an MR image based on an output of the receive coil.

Provided is a brain measurement system including: a geomagnetic correction coil; a geomagnetic gradient correction coil; a transmission coil; a receiving coil; a plurality of resonance adjustment circuits; a plurality of OPM modules provided corresponding to each of the plurality of resonance adjustment circuits for detecting a signal having a resonance frequency output from the resonance adjustment circuit; and a control device for generating an MR image based on the signal detected by the OPM module, wherein, when a direction parallel to a central axis of a head portion of a subject is defined as a Z-axis direction, the resonance frequency related to each of the plurality of resonance adjustment circuits is set according to a magnetic field gradient in the Z-axis direction generated by control of a position of the corresponding receiving coil in the Z-axis direction and a tilted magnetic field.

Brain measurement system

An optically pumped magnetometer includes cells configured to form a first cell region and a second cell region on a measurement target, a pump laser, a probe laser, a first optical system configured to cause pump light to be incident on the first cell region, a second optical system configured to cause the pump light having passed through the first cell region to be incident on the second cell region, a third optical system configured to cause first probe light to be incident on the first cell region, a fourth optical system configured to cause second probe light to be incident on the second cell region, detection portions configured to detect the first probe light having passed through the first cell region and the second probe light having passed through the second cell region, and a deriving portion configured to derive an intensity of a magnetic field.

Optically pumped magnetometer having lasers and optical systems used to derive an intensity of a magnetic field

An optically pumped magnetometerincludes: a cell; a pump laserthat emits pump light; one or more pump light mirrors that cause the pump light guided in a first direction; a probe laserthat emits probe light; a splitting unitthat splits the probe light into multiple light components; one or more probe light mirrors that cause each of the probe light components guided in a second direction, which is a direction perpendicular to the first direction; a detection unit that detects each of the probe light components perpendicular to the pump light inside the cell; and a derivation unit that derives a magnetic field corresponding to a region where each of the probe light components and the pump light are perpendicular to each other based on a detection result of the detection unit.

Optically pumped magnetometer having reduced footprint

A magnetoencephalograph Mincludes: multiple pump-probe type optically pumped magnetometersA; a bias magnetic field forming coilfor applying a bias magnetic field in the same direction as a direction of pump light of each of the multiple pump-probe type optically pumped magnetometersA and in a direction approximately parallel to a scalp; a control devicethat determines a current for the bias magnetic field forming coil and outputs a control signal corresponding to the determined current; and a coil power supplythat outputs a current to the bias magnetic field forming coil in response to the control signal output from the control device.

Magnetoencephalograph

A cell for a optically pumped magnetic sensor measures magnetic field by setting alkali metal atoms to a predetermined excitation state by a pump beam and detecting the excitation state by a probe beam. The cell is provided with a glass substrate which seals the alkali metal atoms and an enclosing gas and transmits the pump beam and the probe beam and a coating layer provided on an inner surface of the glass substrate. The coating layer is made of an inorganic material.

Cell for optically pumped magnetic sensor

A cell module used for a photoexcitation magnetic sensor includes a cell in which an alkali metal is enclosed, a heater which is disposed close to the cell to heat the alkali metal, and a case which forms a decompression region accommodating the cell and the heater.

Cell module for optically pumped magnetic sensor

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.

Gamma ray detector

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 (&#x3b3;-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.

High-energy ray detector and tomographic image acquisition apparatus

A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.

Light-emitting device and light source apparatus

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Hamamatsu, Japan

Motohiro Suyama