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公开(公告)号：US20220183630A1
公开(公告)日：2022-06-16
申请号：US17643047
申请日：2021-12-07
发明人： Ryuichi Nanaumi , Kazuya Okamoto , Takafumi Ohishi
IPC分类号： A61B5/00 , A61B5/055 , G01R33/567
摘要： A subject information acquisition apparatus, comprises: a signal generation unit configured to generate a high-frequency signal corresponding to each of the frequencies; an acquisition unit configured to acquire a plurality of detection signals based on at least one of a reflection signal and a transmission signal; a signal selection unit configured to select at least one detection signal from the plurality of detection signals based on an index value of the plurality of detection signals; a coupling amount detecting unit configured to detect a coupling amount of near-field coupling due to an electric field between the antenna and the subject based on a detection signal; and a displacement detecting unit configured to generate a displacement signal indicating a displacement of the subject based on the coupling amount.
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公开(公告)号：US11372062B2
公开(公告)日：2022-06-28
申请号：US17070078
申请日：2020-10-14
发明人： Sadanori Tomiha , Takafumi Ohishi , Sho Kawajiri , Satoshi Imai
IPC分类号： G01R33/34
摘要： According to one embodiment, a coil element includes an extendable and contractible coil and a capacitor. The capacitor is connected to the coil and has an electrostatic capacity which changes due to a physical change in response to extension or contraction of the coil.
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公开(公告)号：US11327129B2
公开(公告)日：2022-05-10
申请号：US16854060
申请日：2020-04-21
发明人： Takafumi Ohishi , Sadanori Tomiha
IPC分类号： G01R33/341 , A61B5/055 , G01R33/36
摘要： In one embodiment, an MRI apparatus includes: an RF coil configured to receive a magnetic resonance signal from an object and include a first wireless antenna with horizontal polarization; a main body provided with a bore and configured to apply an RF pulse to an object, the bore being a space in which the object is placed during imaging; and at least one second wireless antenna configured to perform wireless communication between the RF coil and the main body via the first wireless antenna, one of the at least one second wireless antenna being disposed at an uppermost portion in an outer periphery of an opening edge of the bore.
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公开(公告)号：US20200341083A1
公开(公告)日：2020-10-29
申请号：US16854060
申请日：2020-04-21
发明人： Takafumi Ohishi , Sadanori Tomiha
IPC分类号： G01R33/341 , G01R33/36 , A61B5/055
摘要： In one embodiment, an MRI apparatus includes: an RF coil configured to receive a magnetic resonance signal from an object and include a first wireless antenna with horizontal polarization; a main body provided with a bore and configured to apply an RF pulse to an object, the bore being a space in which the object is placed during imaging; and at least one second wireless antenna configured to perform wireless communication between the RF coil and the main body via the first wireless antenna, one of the at least one second wireless antenna being disposed at an uppermost portion in an outer periphery of an opening edge of the bore.
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公开(公告)号：US11467236B2
公开(公告)日：2022-10-11
申请号：US16813865
申请日：2020-03-10
发明人： Takafumi Ohishi , Sadanori Tomiha
IPC分类号： G01R33/34 , A61B5/055 , G01R33/561 , G16H30/20 , G16H40/63
摘要： In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being configured to be disposed close to an abject; a signal generator configured to generate a high-frequency signal; a coupling-amount detection circuit configured to detect coupling amount of near-field coupling due to an electric field between the object and the at least one antenna by using the high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on change in the coupling amount of near-field coupling.
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公开(公告)号：US11022668B2
公开(公告)日：2021-06-01
申请号：US16132850
申请日：2018-09-17
发明人： Takafumi Ohishi
IPC分类号： G01R33/561 , G01R33/385 , G01R33/28
摘要： A magnetic resonance imaging apparatus according to the present embodiment includes processing circuitry and imaging control circuitry. The processing circuitry selects a human body model corresponding to a subject from human body models. The processing circuitry estimates local specific absorption rates (SARs) at evaluation points determined using the selected human body model, based on the selected human body model and an amplitude and/or phase of the RF pulse in an imaging protocol for magnetic resonance imaging scheduled to be performed on the subject. The processing circuitry determines whether or not the estimated local SARs fall below a local reference value. The imaging control circuitry executes the imaging protocol by using an amplitude and phase of the RF pulse which make the local SARs fall below the local reference value.
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公开(公告)号：US11519985B2
公开(公告)日：2022-12-06
申请号：US16813850
申请日：2020-03-10
发明人： Takafumi Ohishi , Sadanori Tomiha
IPC分类号： G01R33/36 , G01R33/565 , A61B5/00 , A61B5/055
摘要： In one embodiment, a Magnetic Resonance Imaging (MRI) apparatus includes: an RF coil configured to perform A/D conversion on a magnetic resonance (MR) signal received from an object and wirelessly transmit the MR signal; a main body configured to wirelessly receive the MR signal and generate a system clock; first communication circuitry configured to transmit the system clock by surface electric field communication using electric field propagation along a body surface of the object; and second communication circuitry provided in the RF coil and configured to receive the system clock transmitted by the surface electric field communication, wherein the RF coil is configured to operate based on the received system clock.
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