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公开(公告)号：US09759790B2
公开(公告)日：2017-09-12
申请号：US14314465
申请日：2014-06-25
发明人： Sho Kawajiri , Motohisa Yokoi , Motohiro Miura , Masashi Hori , Kazuyuki Soejima , Naoki Imamura , Haruki Nakamura
IPC分类号： G01V3/00 , G01R33/385 , A61B5/055 , G01R33/561
CPC分类号： G01R33/3852 , A61B5/055 , G01R33/5616
摘要： A magnetic resonance imaging device according to an embodiment includes a gradient amplifier, a battery, a detector, and a battery controller. The gradient amplifier supplies electric power to the gradient coil. The battery is charged with electric power that is supplied from the power supply. The detector detects a high power output request on the gradient amplifier. The battery controller controls to supply electric power charged in the battery in addition to electric power supplied from the power supply to the gradient amplifier when the high power output request is detected.
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公开(公告)号：US10416255B2
公开(公告)日：2019-09-17
申请号：US15360154
申请日：2016-11-23
发明人： Sho Kawajiri , Naoyuki Furudate , Yutaka Machii
IPC分类号： G01R33/385
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a gradient coil, power supply circuitry, and control circuitry. The gradient coil generates a gradient magnetic field. The power supply circuitry supply power to the gradient coil, the power being required by the gradient. The control circuitry temporarily change an upper limit value of power to be supplied by the power supply circuitry to a second value higher than a first value as a rated value based on the power required by the gradient coil.
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公开(公告)号：US09989602B2
公开(公告)日：2018-06-05
申请号：US14068385
申请日：2013-10-31
发明人： Naoki Imamura , Motohisa Yokoi , Kazuyuki Soejima , Motohiro Miura , Sho Kawajiri , Haruki Nakamura
IPC分类号： G01R33/36
CPC分类号： G01R33/36
摘要： An MRI apparatus includes a data acquisition system, a charge/discharge element and a power control unit. The data acquisition system acquires nuclear magnetic resonance signals from an imaging region by performing a scan. The charge/discharge element is a part of an electric power system of the MRI apparatus, and is charged with external electric power. The power control unit controls the electric power system in such a manner that at least one unit excluding the data acquisition system is supplied with electric power from the charge/discharge element.
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公开(公告)号：US09726734B2
公开(公告)日：2017-08-08
申请号：US13863664
申请日：2013-04-16
发明人： Masashi Hori , Motohiro Miura , Motohisa Yokoi , Sho Kawajiri
IPC分类号： G01V3/00 , G01R33/28 , G01R33/385 , G01R33/54
CPC分类号： G01R33/28 , G01R33/3852 , G01R33/546
摘要： An MRI apparatus includes a charge/discharge controlling unit, a judging unit and a condition restricting unit. The charge/discharge controlling unit includes a charge/discharge element, receives electric power, and charges the charge/discharge element by using the received electric power. The charge/discharge controlling unit also supplies a gradient magnetic field coil with electric power discharged from the charge/discharge element at a time of performance of magnetic resonance imaging. The judging unit judges whether capacitance of the charge/discharge element falls below a threshold value or not. The condition restricting unit restricts electric power amount supplied to the gradient magnetic field coil by restricting conditions of an imaging sequence, when the capacitance of the charge/discharge element falls below the threshold value.
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公开(公告)号：US10459047B2
公开(公告)日：2019-10-29
申请号：US14699125
申请日：2015-04-29
发明人： Sho Kawajiri , Motohiro Miura
IPC分类号： G01V3/00 , G01R33/385 , G01R33/54 , G01R33/34
摘要： A magnetic resonance imaging apparatus according to an embodiment includes a gradient magnetic field power supply configured to supply power to a gradient coil. The gradient magnetic field power supply includes a plurality of switching circuits and a processing circuitry. Each of the switching circuits is configured to output a predetermined pulse voltage. The processing circuitry is configured to change the number of switching circuits to be caused to perform switching operation among the switching circuits, in accordance with an intensity of the voltage to be output to the gradient coil.
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公开(公告)号：US10401449B2
公开(公告)日：2019-09-03
申请号：US15222459
申请日：2016-07-28
发明人： Yutaka Machii , Naoyuki Furudate , Sho Kawajiri , Motohiro Miura
IPC分类号： G01R33/54 , G01R33/385
摘要： A magnetic resonance imaging apparatus according to an embodiment includes a processing circuit and a sequence control circuit. The processing circuit calculates, based on an imaging sequence to be executed in magnetic resonance imaging, a value of a current flowing through a closed circuit by using an equivalent circuit and determines, prior to an execution of the imaging sequence, based on the value of the current, whether it is acceptable to execute the imaging sequence. The sequence control circuit executes the imaging sequence. The equivalent circuit is an equivalent circuit for a circuit that includes a gradient coil and that has a first circuit and a second circuit. The first circuit is connected to a power supply and has self-inductance. The second circuit includes at least one closed circuit having mutual inductance with the first circuit.
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公开(公告)号：US20170176555A1
公开(公告)日：2017-06-22
申请号：US15377249
申请日：2016-12-13
发明人： Sho Kawajiri , Motohiro Miura , Naoyuki Furudate , Yutaka Machii
IPC分类号： G01R33/385 , G01R33/3875
CPC分类号： G01R33/3852 , G01R33/3875
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a gradient magnetic field power supply, a voltmeter, and processing circuitry. The gradient magnetic field power supply includes an amplifier amplifying an input signal based on information of a gradient magnetic field waveform and outputting the amplified input signal to a gradient coil, a power supply device supplying power to the amplifier, and a capacitor bank supplying power, together with the power supply device, to the amplifier. The voltmeter measures a voltage of the capacitor bank. The processing circuitry calculates frequency characteristics of an impedance of the gradient coil, based on a voltage variation of the capacitor bank which was measured by the voltmeter, and controls imaging in accordance with the calculated frequency characteristics.
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公开(公告)号：US10809329B2
公开(公告)日：2020-10-20
申请号：US15366451
申请日：2016-12-01
发明人： Motohiro Miura , Masashi Hori , Sho Kawajiri
IPC分类号： G01R33/385 , G01R33/54
摘要： A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.
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公开(公告)号：US10408899B2
公开(公告)日：2019-09-10
申请号：US15366451
申请日：2016-12-01
发明人： Motohiro Miura , Masashi Hori , Sho Kawajiri
IPC分类号： G01R33/385 , G01R33/54
摘要： A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.
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公开(公告)号：US10048337B2
公开(公告)日：2018-08-14
申请号：US14068361
申请日：2013-10-31
发明人： Motohisa Yokoi , Motohiro Miura , Sho Kawajiri , Kazuyuki Soejima , Haruki Nakamura , Naoki Imamura
摘要： Image diagnosis apparatus (20) generates image data of an object by using external electric power, and includes a charge/discharge element and a charge/discharge control circuit. The charge/discharge element is charged with the external electric power and supplies part of the consumed power of the image diagnosis apparatus by discharging. The charge/discharge control circuit controls charge and discharge of the charge/discharge element in such a manner that the charge/discharge element discharges in a period during which the consumed power is larger than a predetermined power amount and the charge/discharge element is charged in a period during which the consumed power is smaller than the predetermined power amount.
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