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1.发明公开公开(公告)号：US20230280425A1
公开(公告)日：2023-09-07
申请号：US18110506
申请日：2023-02-16
发明人： Rainer Schneider , Jürgen Nistler , Razvan Lazar , Stephan Biber
IPC分类号： G01R33/385 , G01R33/36 , G01R33/565
CPC分类号： G01R33/3852 , G01R33/3621 , G01R33/56518
摘要： A magnetic resonance tomography system with a sensor for detecting spikes and with a gradient coil. Nuclear spins of an object under observation are excited by a magnetic alternating field of the magnetic resonance tomography system. A gradient field is generated by the magnetic resonance tomography system using the gradient coil. A magnetic resonance signal is acquired using a receiving antenna of the magnetic resonance tomography system and an interference signal using the sensor. From the magnetic resonance signal an image is reconstructed as a function of the acquired interference signal of the sensor.
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公开(公告)号：US11550009B2
公开(公告)日：2023-01-10
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 , G01R33/54 , G01R33/36
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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3.发明申请公开(公告)号：US20190257899A1
公开(公告)日：2019-08-22
申请号：US16281080
申请日：2019-02-20
发明人： Jürgen Nistler , Razvan Lazar
摘要： A method for adjusting a field distribution of an antenna arrangement of a magnetic resonance system is provided. The symmetry of the field distribution may be impaired by positional inaccuracy of the antenna arrangement in the magnetic resonance system. The antenna arrangement comprises oscillating circuit antenna elements and switching elements. Each of the oscillating circuit antenna elements is assigned a respective switching element of the switching elements. A respective switching element is configured to couple the assigned oscillating circuit antenna element operatively to the antenna arrangement in dependence on a status of the respective switching element. During the method, symmetry information on the field distribution in the antenna arrangement is measured, and the switching elements are automatically adjusted using the measured symmetry information, such that the symmetry of the field distribution in the interior of the antenna arrangement is increased.
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公开(公告)号：US20190257896A1
公开(公告)日：2019-08-22
申请号：US16277154
申请日：2019-02-15
发明人： Jürgen Nistler
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：US20190019620A1
公开(公告)日：2019-01-17
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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6.发明授权公开(公告)号：US11940513B2
公开(公告)日：2024-03-26
申请号：US17476459
申请日：2021-09-15
发明人： Stephan Biber , Jürgen Nistler , Markus Vester
CPC分类号： G01R33/3692 , G01R33/34038 , G01R33/3614
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：US20220137168A1
公开(公告)日：2022-05-05
申请号：US17519563
申请日：2021-11-04
发明人： Jürgen Nistler , Markus Vester
IPC分类号： G01R33/422
摘要： A magnetic resonance tomography system that includes a transmitter for generating an excitation signal and a body coil for emitting the excitation signal, and a method for operation of the magnetic resonance tomography system are provided. The magnetic resonance tomography system has a patient tunnel, in which the body coil is arranged. The magnetic resonance tomography system also has a first transmission interference suppression antenna that is arranged between the body coil and an opening in the patient tunnel. The first transmission interference suppression antenna is configured to provide a spatial transmission characteristic that may be compared with the body coil.
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公开(公告)号：US11193997B2
公开(公告)日：2021-12-07
申请号：US16546296
申请日：2019-08-20
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 , G01R33/54 , G01R33/36
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：US11131730B2
公开(公告)日：2021-09-28
申请号：US16130967
申请日：2018-09-13
发明人： Ludwig Eberler , Razvan Lazar , Volker Matschl , Jürgen Nistler , Martin Schramm
摘要： A magnetic resonance coil having at least one tuning device for tuning the magnetic resonance coil, a magnetic resonance device, and a method for tuning a magnetic resonance coil are provided. The at least one tuning device includes a plurality of capacitors that are mechanically interlinked.
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公开(公告)号：US20200064425A1
公开(公告)日：2020-02-27
申请号：US16546296
申请日：2019-08-20
发明人： Stephan Biber , Adrian Bampton , Markus Vester , Andre de Oliveira , Volker Model , Jürgen Nistler , Andreas Potthast , Paul Adam 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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