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公开(公告)号：US11693074B2
公开(公告)日：2023-07-04
申请号：US17527304
申请日：2021-11-16
发明人： Volker Model
IPC分类号： G01R33/54 , H01F7/06 , G01R33/42 , G01R33/3815
CPC分类号： G01R33/543 , G01R33/3815 , G01R33/42 , H01F7/064
摘要： An electric circuit arrangement for energizing a magnet of a magnetic resonance imaging facility includes a first circuit part, a second circuit part and a control facility. In an embodiment, the first circuit part is designed to generate a direct voltage as an DC link voltage from an alternating voltage and the second circuit part is designed as a current source fed by the DC link voltage. The second circuit part includes a down converter controllable by the control facility, a transformer switchable by the control facility and a rectifier. A primary current is generatable from the DC link voltage via the down converter. The primary current is feedable by a switching facility, switched by the control facility into a primary side of the transformer, and a secondary current for energizing the magnet is generatable via the rectifier connected to a secondary side of the transformer.
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公开(公告)号：US09684051B2
公开(公告)日：2017-06-20
申请号：US14112039
申请日：2011-04-21
IPC分类号： G01R33/58 , G01R33/42 , G01R33/421 , G01R33/44
CPC分类号： G01R33/583 , G01R33/42 , G01R33/421 , G01R33/445
摘要： The invention relates to a prepolarizing magnetic resonance- or relaxation-based measurement system, comprising a prepolarizing coil for producing a prepolarizing field at the target zone, means for pulsing the prepolarizing field according to a first pulsing scheme, and means for measuring magnetization of a target placed in the target zone. According to the invention, the system further comprises a shielding coil for producing a shielding field and means for pulsing the shielding field according to a second pulsing scheme, whereby the shielding coil and the second pulsing scheme are arranged to reduce the formation of unwanted transient fields caused by the coupling of the prepolarizing coil to conducting or magnetic structures in the surroundings of the system. The invention also relates to a corresponding method of measurement and a process of designing the pulsing schemes for the system or process. By means of the invention, the formation of unwanted eddy currents, for example, in the surroundings of the measurement system, can be reduced.
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公开(公告)号：US09612305B2
公开(公告)日：2017-04-04
申请号：US13866795
申请日：2013-04-19
IPC分类号： G01V3/00 , G01R33/42 , H05K9/00 , G01R33/422
CPC分类号： G01R33/42 , G01R33/422 , H05K9/0086
摘要： Shielding for an electronic circuit includes at least one substrate. A metal structure is disposed on at least one side of the at least one substrate. The metal structure includes a number of non-contiguous part areas. Adjacent part areas that are disposed on a same side of the substrate are spaced apart from one another by a boundary line running in a serpentine shape.
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4.发明申请MAGNETIC RESONANCE-COMPATIBLE ELECTRICAL DEVICE WITH RADIO FREQUENCY SHIELDING OR AN ENCLOSURE 有权具有无线电频率屏蔽或外壳的磁兼容兼容电气设备公开(公告)号：US20120242339A1
公开(公告)日：2012-09-27
申请号：US13509799
申请日：2010-11-18
申请人： Eduardo M. Rey , Robert A. Harwell
发明人： Eduardo M. Rey , Robert A. Harwell
IPC分类号： G01R33/422
CPC分类号： G01R33/28 , A61N1/3718 , G01R33/42
摘要： An apparatus comprises an electrical device or component (40) and a radio frequency shield arranged to shield the electrical device or component. The apparatus is disposed in a radio frequency (Bi) field generated by a magnetic resonance scanner and in time varying magnetic field gradients generated by the magnetic resonance scanner (10). The radio frequency shield includes an electrically conductive sheet or layer having openings suppressing time varying magnetic field gradient induced vibration of the radio frequency shield.
摘要翻译： 一种装置包括电气装置或部件（40）和布置成屏蔽电气装置或部件的射频屏蔽。 该装置设置在由磁共振扫描仪产生的射频（Bi）场中，并且由磁共振扫描器（10）产生的随时间变化的磁场梯度。 射频屏蔽包括具有抑制射频屏蔽的时变磁场梯度引起的振动的开口的导电片或层。
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公开(公告)号：US5262727A
公开(公告)日：1993-11-16
申请号：US839193
申请日：1992-02-20
申请人： Ali Behbin , Michael D. Cummings
发明人： Ali Behbin , Michael D. Cummings
IPC分类号： G01R33/32 , G01R33/30 , G01R33/42 , G01R33/422 , G01R33/20
CPC分类号： G01R33/422 , G01R33/30 , G01R33/42
摘要： An NMR probe having RF shield means to confine the RF magnetic field to an axial region having a length less than the length of the coil form.
摘要翻译： 具有RF屏蔽装置的NMR探针用于将RF磁场限制在具有小于线圈形式的长度的长度的轴向区域上。
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公开(公告)号：US4613820A
公开(公告)日：1986-09-23
申请号：US597803
申请日：1984-04-06
IPC分类号： A61B5/055 , A61B10/00 , E04H5/02 , E04H5/06 , G01D11/24 , G01R33/32 , G01R33/42 , G01R33/422 , G12B17/02 , H05K9/00 , G01R33/20
CPC分类号： H05K9/00 , G01D11/24 , G01R33/42 , G01R33/422 , Y10S505/844 , Y10S505/872
摘要： A radio-frequency shielded room for a nuclear magnetic resonance imaging system has at least one electrically-conductive shield wall substantially enclosing a predetermined volume adjacent to one end of the bore formed through an imaging magnet within which bore the imaging process is carried out. The at least one wall has an aperture therethrough substantially at and in registration with the one bore end. A hollow shield member, of an electrically-conductive material, extends through the magnet bore and has a first end region periphery aligned with and substantially electrically connected to the entire periphery of the aperture in the at least one wall. A second end of hollow shield member extends at least to the remaining end of the magnet bore, where it is enclosed with an electrically-conductive cap substantially electrically connected about the entire periphery of the hollow shield member second end. The at least one wall, the hollow shield member and the second end cap form a shielded room substantially completely enclosing the volume extending through the magnet bore and adjacent to one end thereof, which volume is effectively shielded from radio frequency signals emanating from outside the enclosed volume.
摘要翻译： 用于核磁共振成像系统的射频屏蔽室具有至少一个导电屏蔽壁，其基本上围绕通过成像磁体形成的孔的一端附近的预定体积，在该孔内进行成像处理。 所述至少一个壁具有基本上与所述一个孔端部对准并与其一致的孔。 导电材料的中空屏蔽构件延伸穿过磁体孔，并且具有与至少一个壁中的孔的整个周边对准并基本上电连接的第一端区周边。 中空屏蔽构件的第二端至少延伸到磁体孔的剩余端部，在那里其被围绕中空屏蔽构件第二端的整个周边基本上电连接的导电盖封闭。 所述至少一个壁，所述中空屏蔽构件和所述第二端盖形成屏蔽室，其基本上完全包围延伸通过所述磁体孔并且邻近所述磁体孔的体积，所述体积被有效地屏蔽在从封闭的外部发出的射频信号 卷。
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公开(公告)号：US11802923B2
公开(公告)日：2023-10-31
申请号：US17819690
申请日：2022-08-15
IPC分类号： G01V3/175 , G01R33/28 , G01R33/385 , G01R33/42
CPC分类号： G01R33/288 , G01R33/385 , G01R33/42 , G01V3/175
摘要： Systems and methods for imaging a subject with a magnetic resonance imaging system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings, such as gradient amplitudes and gradient slew rates, above a threshold at which peripheral nerve stimulation is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.
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公开(公告)号：US11644519B2
公开(公告)日：2023-05-09
申请号：US17213153
申请日：2021-03-25
发明人： Bo Li , Xiangyu Ma
摘要： The present disclosure relates to systems and methods for shielding electromagnetic waves. The system may include an imaging device, a shielding layer assembly disposed on at least a first portion of the imaging device, and a shielding cover assembly disposed on at least a second portion of the imaging device. When the shielding cover assembly is coupled to the shielding layer assembly, the shielding cover assembly and the shielding layer assembly may be combined to form a shielding space that is shielded against electromagnetic waves from an outside of the shielding space.
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公开(公告)号：US20180074139A1
公开(公告)日：2018-03-15
申请号：US15807450
申请日：2017-11-08
发明人： Mokhtar Ziarati
CPC分类号： G01R33/283 , G01N21/35 , G01R33/42 , G01R33/4806 , G06F3/013
摘要： A head-up display and eye-tracker system, suitable for use with a patient in an MRI tube during an MRI procedure. An electronic display assembly includes an outer display tube housing for housing an electronic display device for generating images, the outer tube housing fabricated of an electrically conductive, non-ferrous material. An eye-tracker camera assembly includes an outer camera tube housing for housing an electronic camera sensor, the outer tube camera housing fabricated of an electrically conductive, non-ferrous material. An eyepiece assembly includes an outer housing. A beam splitter assembly includes a beam splitter block having a receptacle holding a beam splitter, the block formed of an electrically conductive, non-ferrous material. The beam splitter reflects light from the display onto the patient's eye, and allows light reflected from the patient's eye to pass to the camera sensor. In another embodiment as a display system, the eye-tracker camera assembly is omitted.
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公开(公告)号：US20160054399A1
公开(公告)日：2016-02-25
申请号：US14931344
申请日：2015-11-03
发明人： Akio MORI
CPC分类号： G01R33/0052 , A61B5/0046 , A61B5/055 , G01R33/28 , G01R33/42 , G01R33/421 , G01R33/422
摘要： A magnetic resonance imaging apparatus according to an embodiment includes an installer provided on a gantry and configured to be capable of installing thereon an electronic apparatus. The magnetic resonance imaging apparatus according to the embodiment includes a drawing structure configured to draw out the electronic apparatus installed on the installer to a position that is away from the gantry by a certain distance in excitation of a static magnetic field magnet.
摘要翻译： 根据实施例的磁共振成像装置包括设置在台架上并被构造成能够在其上安装电子设备的安装件。 根据实施例的磁共振成像装置包括：绘图结构，其构造成将安装在安装件上的电子设备从激活静磁场磁体的距离远离机架移动一定距离。
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