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公开(公告)号：US20220301705A1
公开(公告)日：2022-09-22
申请号：US17654674
申请日：2022-03-14
发明人： Takafumi OHISHI , Sadanori TOMIHA
摘要： In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being disposed close to an object; a signal generator configured to generate a radio-frequency (RF) signal; and a displacement detection circuit configured to detect a physical displacement of the object based on the RF signal, wherein the at least one antenna includes: a dipole antenna having a feeding point to be supplied with the RF signal, the feeding point being positioned in a center of the dipole antenna; a coaxial line configured to supply the RF signal to the feeding point; and a conductor element that has a ¼ wavelength and is short-circuited on one end to an outer conductor of the coaxial line.
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公开(公告)号：US20200292650A1
公开(公告)日：2020-09-17
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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公开(公告)号：US20220349967A1
公开(公告)日：2022-11-03
申请号：US17658467
申请日：2022-04-08
发明人： Takafumi OHISHI , Sadanori TOMIHA
IPC分类号： G01R33/36 , G01R33/385
摘要： According to one embodiment, an arrayed structure includes a cylindrical-shaped conductor layer and a cylindrical-shaped layer stack. The cylindrical-shaped layer stack is arranged on an inner periphery of the conductor layer and a plurality of frequency selective surfaces are arranged in layers and stacked. Each of the frequency selective surfaces has a plurality of elements which are periodically arranged. Each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a first element that faces an adjacent element in the same layer is closer to a center of the first element than another portion of edge.
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公开(公告)号：US20210298629A1
公开(公告)日：2021-09-30
申请号：US17212067
申请日：2021-03-25
发明人： Takafumi OHISHI , Sadanori TOMIHA
IPC分类号： A61B5/055 , A61B5/0205 , G01R33/561 , G01R33/34
摘要： In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being disposed close to an object; a signal generator configured to generate a high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on the high-frequency signal, wherein the at least one antenna includes: a main antenna to be supplied with the high frequency signal; and a parasitic element to which the high frequency signal is not supplied.
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公开(公告)号：US20190086499A1
公开(公告)日：2019-03-21
申请号：US16132850
申请日：2018-09-17
发明人： Takafumi OHISHI
IPC分类号： G01R33/561 , G01R33/28 , G01R33/385
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：US20200294658A1
公开(公告)日：2020-09-17
申请号：US16813865
申请日：2020-03-10
发明人： Takafumi OHISHI , Sadanori Tomiha
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：US20210132165A1
公开(公告)日：2021-05-06
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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