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11.发明申请公开(公告)号：US20220082642A1
公开(公告)日：2022-03-17
申请号：US17476459
申请日：2021-09-15
发明人： Stephan Biber , Jürgen Nistler , Markus Vester
摘要： A magnetic resonance tomography unit and a method for operating the magnetic resonance tomography unit are provided. The magnetic resonance tomography unit has a transmission interference suppression device with a transmission interference suppression control system, a sensor, and a transmission interference suppression antenna. The transmission interference suppression device is configured to acquire, with the sensor, an excitation signal of the transmitter, and determine, with the transmission interference suppression control system, a transmission interference suppression signal dependent upon the acquired excitation signal of the transmitter. The transmission interference suppression device is configured to transmit, via the transmission interference suppression antenna, the transmission interference suppression signal, so that at a predetermined location outside the magnetic resonance tomography unit, the excitation signal emitted by the transmitter via the transmitter antenna is attenuated.
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公开(公告)号：US20210325494A1
公开(公告)日：2021-10-21
申请号：US17223333
申请日：2021-04-06
发明人： Stephan Biber , Jürgen Nistler , Rainer Schneider , Markus Vester
IPC分类号： G01R33/3875 , G01R33/56
摘要： A magnetic resonance tomography system has an interference suppression transmitter and an interference suppression antenna. The interference suppression transmitter is configured to output an interference suppression signal via the interference suppression antenna as a function of a transmission interference suppression parameter determined from a patient property. In a predetermined region of an environment of the magnetic resonance tomography system, a field strength of the excitation pulse is reduced by destructive interference.
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公开(公告)号：US10718843B2
公开(公告)日：2020-07-21
申请号：US16293118
申请日：2019-03-05
发明人： Jürgen Nistler
IPC分类号： G01R33/565 , G01R33/341 , G01R33/58
摘要： A device and a method for detecting a spike during a magnetic resonance scan are provided. The device has a first receiver with a first signal connection for connecting a local coil and a second receiver with a second signal connection for connecting a reference antenna. The device is configured to compare a first signal received by the first receiver via the first signal connection with a second signal received by the second receiver via the second signal connection and, in the event of a predetermined deviation, to emit a warning signal.
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公开(公告)号：US10534051B2
公开(公告)日：2020-01-14
申请号：US16007886
申请日：2018-06-13
发明人： Ludwig Eberler , Jürgen Nistler , Markus Vester
IPC分类号： G01V3/00 , G01R33/422 , H01Q7/00 , G01R33/34 , H01Q1/52
摘要： A radio-frequency shielding unit for shielding a radio-frequency antenna unit of a magnetic resonance apparatus and a magnetic resonance apparatus are provided. The radio-frequency shielding unit includes a support layer, a first conducting layer, an insulating layer, and a second conducting layer. The first conducting layer is arranged between the support layer and the insulating layer, and the insulating layer is arranged between the first conducting layer and the second conducting layer.
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公开(公告)号：US10345401B2
公开(公告)日：2019-07-09
申请号：US15977207
申请日：2018-05-11
发明人： Jürgen Nistler , Markus Vester , Christian Wünsch
摘要： An apparatus and a method for detecting an antenna coil with a non-active detuning apparatus are provided. The apparatus has a transmitter, an antenna, an amplitude meter, and a controller. The controller actuates the transmitter such that the transmitter emits radio-frequency signals with different predetermined amplitudes via the antenna. The controller acquires testing amplitudes with the amplitude meter as a function of the emitted signal and determines a testing relationship between the predetermined amplitudes and the acquired testing amplitudes. If the determined testing relationship deviates from a predetermined reference relationship, a signal is output.
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公开(公告)号：US20220291310A1
公开(公告)日：2022-09-15
申请号：US17690125
申请日：2022-03-09
IPC分类号： G01R33/36 , G01R33/58 , G01R33/421
摘要： A magnetic resonance tomography (MRT) unit includes a field magnet, a transmitter, and a transmitting antenna. The MRT unit also has a transmission interference suppression facility with a transmission interference suppression controller, a plurality of sensors, and a transmission interference suppression antenna. The transmission interference suppression facility is configured to pick up, with the sensors, an excitation signal of the transmitter, determine, with the transmission interference suppression controller, a transmission interference suppression signal as a function of the excitation signal of the transmitter, and emit the signal via the transmission interference suppression antenna, so that at a predetermined location outside of the MRT unit, an electromagnetic alternating field of an excitation signal emitted by the transmitter via the transmitting antenna is attenuated. The sensors are arranged in a near field of the transmitting antenna, and the predetermined location of the attenuation is in a far field of the transmitting antenna.
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公开(公告)号：US20210356540A1
公开(公告)日：2021-11-18
申请号：US17386533
申请日：2021-07-27
发明人： Stephan Biber , Adrian Bampton , Markus Vester , Andre de Oliveira , Volker Model , Jürgen Nistler , Andreas Potthast , Adam Paul Johnstone
IPC分类号： G01R33/3815 , A61B5/055 , G01R33/44
摘要： A method of operating a magnetic resonance imaging (MRI) apparatus includes exciting a body coil of the MRI apparatus to emit a radio-frequency signal, determining a center frequency of a resonance curve of the body coil, and calculating a magnet target frequency based on the determined center frequency. A magnet is ramped to the magnet target frequency.
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公开(公告)号：US10930428B2
公开(公告)日：2021-02-23
申请号：US16027685
申请日：2018-07-05
发明人： Ludwig Eberler , Razvan Lazar , Volker Matschl , Jürgen Nistler , Martin Schramm
摘要： The disclosure relates to a compensation capacitor for an antenna of a magnetic resonance scanner and a corresponding antenna with a compensation capacitor. The compensation capacitor has a first electrode and a second electrode arranged in parallel. An insulation material configured to resist high voltages and a dielectric with low dielectric losses are arranged between the first and the second electrode. The second electrode and/or the dielectric may be moved relative to the first electrode such that a surface area of a projection of the surface of the first electrode along the surface normal of the first electrode to the surface of the second electrode and/or the dielectric is variable.
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公开(公告)号：US10830846B2
公开(公告)日：2020-11-10
申请号：US16277154
申请日：2019-02-15
发明人： Jürgen Nistler
IPC分类号： G01R33/34 , G01R33/36 , H01Q21/24 , G01R33/422
摘要： A transmitting antenna for a magnetic resonance device includes a plurality of antenna conductors arranged spaced from one another circumferentially around a center line and extending parallel to the center line, and a screening element extending parallel to the center line and circumferentially encompassing the antenna conductors. For at least one pair of the antenna conductors, a radial distance between a first antenna conductor of the pair and the screening element is smaller than a radial distance between a second antenna conductor of the pair and the screening element, a width of the first antenna conductor is smaller in the circumferential direction than a width of the second antenna conductor in the circumferential direction, axial ends of the first antenna conductor are coupled together via a higher capacitance capacitor than axial ends of the second antenna conductor.
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公开(公告)号：US11500051B2
公开(公告)日：2022-11-15
申请号：US17223333
申请日：2021-04-06
发明人： Stephan Biber , Jürgen Nistler , Rainer Schneider , Markus Vester
IPC分类号： G01R33/3875 , G01R33/56 , G01R33/54 , G01R33/422
摘要： A magnetic resonance tomography system has an interference suppression transmitter and an interference suppression antenna. The interference suppression transmitter is configured to output an interference suppression signal via the interference suppression antenna as a function of a transmission interference suppression parameter determined from a patient property. In a predetermined region of an environment of the magnetic resonance tomography system, a field strength of the excitation pulse is reduced by destructive interference.
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