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公开(公告)号：US11550006B2
公开(公告)日：2023-01-10
申请号：US16676504
申请日：2019-11-07
发明人： Sadanori Tomiha
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires an ambient temperature relating to a magnetic resonance imaging examination and determines an interlock value of a specific absorption rate (SAR) in accordance with the ambient temperature.
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公开(公告)号：US11460524B2
公开(公告)日：2022-10-04
申请号：US17210625
申请日：2021-03-24
IPC分类号： G01R33/34
摘要： A radio frequency coil according to an embodiment is configured to receive a magnetic resonance signal from an examined subject. The radio frequency coil includes an expandable and contractible first element and an expandable and contractible second element. The radio frequency coil has an overlap region where a first loop formed by the first element overlaps with a second loop formed by the second element. The ratio of the area of the overlap region to the area of the region enclosed by the first loop changes in accordance with expansion/contraction of the first element forming the first loop. The first element and the second element include liquid metal in at least a part thereof.
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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：US11061090B2
公开(公告)日：2021-07-13
申请号：US16181772
申请日：2018-11-06
IPC分类号： G01R33/34 , G01R33/422 , G01R33/385
摘要： A magnetic resonance imaging apparatus according to an embodiment includes a Radio Frequency (RF) coil configured to apply an RF magnetic field to a subject. The RF coil includes: a supporting member formed to have a circular cylindrical shape; and an electrically-conductive member which is arranged to extend along an axial direction of the supporting member and through which a radio frequency current flows when the RF magnetic field is generated. The electrically-conductive member includes: a first part provided on an outer circumferential surface of the supporting member; and a second part positioned farther away from an RF shield provided on an outer circumferential side of the RF coil than the first part is, in terms of a radial direction of the supporting member.
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公开(公告)号：US10718832B2
公开(公告)日：2020-07-21
申请号：US15961943
申请日：2018-04-25
发明人： Haruki Nakamura , Sadanori Tomiha
摘要： An adjustment method according to an embodiment of a magnetic resonance imaging apparatus, including a transmission coil configured to transmit a radio frequency (RF) pulse and an RF amplifier configured to transmit an RF pulse signal to the transmission coil, includes steps of detecting and adjusting. The detecting step detects an output power level of the RF amplifier. The adjusting step adjusts a line length of a transmission line to be provided between the RF amplifier and the transmission coil such that the output power level of the RF amplifier exceeds a predetermined value in a state where there is a load on the transmission coil, or such that the output power level of the RF amplifier falls below a predetermined value in a state where there is no load on the transmission coil.
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公开(公告)号：US20190137579A1
公开(公告)日：2019-05-09
申请号：US16181772
申请日：2018-11-06
IPC分类号： G01R33/34
摘要： A magnetic resonance imaging apparatus according to an embodiment includes a Radio Frequency (RE) coil configured to apply an RF magnetic field to a subject. The RF coil includes: a supporting member formed to have a circular cylindrical shape; and an electrically-conductive member which is arranged to extend along an axial direction of the supporting member and through which a radio frequency current flows when the RF magnetic field is generated. The electrically-conductive member includes: a first part provided on an outer circumferential surface of the supporting member; and a second part positioned farther away from an RF shield provided on an outer circumferential side of the RF coil than the first part is, in terms of a radial direction of the supporting member.
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