公开(公告)号：EP3264126A1

公开(公告)日：2018-01-03

申请号：EP17179363.1

申请日：2017-07-03

申请人： Commissariat à l'Energie Atomique et aux Energies Alternatives

发明人： LUONG, Michel ,  GIACOMINI, Eric

IPC分类号： G01R33/34 ,  G01R33/345 ,  G01R33/36

CPC分类号： G01R33/34046 ,  G01R33/3453 ,  G01R33/3628 ,  G01R33/3635 ,  G01R33/3642 ,  G01R33/3685

摘要： La présente invention concerne une antenne volumique radiofréquence (100), comportant une pluralité de conducteurs longitudinaux (2) et un circuit de désaccord pour modifier la fréquence de résonance du mode propre de ladite antenne (100) apte à désaccorder ladite antenne sans contact avec lesdits conducteurs longitudinaux (2), ledit circuit de désaccord étant composé par une pluralité de circuits résonants (8) présentant un dispositif de commutation (11) et résonant : à une première fréquence de résonance proche de la fréquence de résonance du mode propre de ladite antenne lorsque le moyen de commutation (11) est en position fermée de manière à induire par effet inductif une réactance sur chaque conducteur longitudinal (2) et à modifier la fréquence de résonance du mode propre de ladite antenne (100) ; à une deuxième fréquence de résonance supérieure ou inférieure à la fréquence de résonance du mode propre de ladite antenne de manière à minimiser le couplage entre le circuit de désaccord et les conducteurs longitudinaux (2) lorsque ledit moyen de commutation (11) est en position ouverte, ladite antenne volumique étant caractérisée en ce que l'antenne est une antenne quart-d'onde et en ce que les circuits résonants (8) sont positionnés longitudinalement dans l'antenne (100) à une position où le champ magnétique B1 est maximal.

摘要翻译： 本发明涉及一种具有多个纵向导体（2）的RF天线体积（100）和用于改变所述适于调谐天线（100），所述天线，而不接触所述的本征模的谐振频率失谐电路 长导体（2），所述失谐电路由多个（8），其具有开关元件（11）和谐振的谐振电路的部分由：所述天线的本征模的谐振频率附近的第一谐振频率 当切换装置（11）被设置成通过感应作用，以诱导在每个纵向导体（2）的闭合位置和电抗修改的本征模的谐振频率，所述天线（100）; 在第二谐振频率比的本征模的谐振频率更高或更低的所述天线，以便最小化失谐电路和纵向导体（2）当所述开关装置（11）处于打开位置之间的耦合 所述体积天线的特征在于，所述天线是四分之一波长天线，并且所述谐振电路（8）在所述天线（100）中纵向地定位在所述磁场B1处于最大值的位置 。

公开(公告)号：EP3136119A1

公开(公告)日：2017-03-01

申请号：EP16183941.0

申请日：2016-08-12

申请人： Samsung Electronics Co., Ltd.

发明人： KOH, Dong Yaen ,  LEE, Han Lim

IPC分类号： G01R33/36 ,  H03K17/00

CPC分类号： G01R33/3642 ,  G01R33/3664 ,  G01R33/543 ,  H03K17/002

摘要： A magnetic resonance imaging (MRI) device includes at least one switching cell that uses a first switcher (310) to switch paths for two of four radio frequency (RF) signals is used to output the two RF signals. The MRI device includes RF coils including a plurality of coils for receiving RF signals from an object to which magnetic fields are applied; an image processor for creating a magnetic resonance image based on the received RF signals; and a switching unit for switching connections between a plurality of input ports (341, 342, 343, 344) connectable to the plurality of coils and a plurality of output ports (323, 333) connectable to the image processor, wherein the switching unit includes at least one switching cell including four input ports, two output ports connected to two of the four input ports, and a first switcher (310) for switching between paths extended from second and third input ports among the four input ports.

摘要翻译： 一种磁共振成像（MRI）装置，包括至少一个开关单元做了使用第一切换器（310）切换为两个四个射频（RF）信号的路径被用于输出所述两个RF信号。 MRI装置包括RF线圈包括线圈，用于从在到哪个磁场施加对象接收RF信号的多个; 用于基于所接收的RF信号的磁共振图像的图像处理器; 和用于切换输入端口（341，342，343，344），可连接到线圈的多个A多元性和输出端口（323，333）连接到所述图像处理器的之间的多个连接，worin切换单元的切换单元包括 至少一个开关单元，其包括四个输入端口，两个输出端口连接到两个的四个输入端口，和用于从第二和第三输入端口的四个输入端口之间延伸的路径之间进行切换的第1开关器（310）。

公开(公告)号：EP3112889A1

公开(公告)日：2017-01-04

申请号：EP15174571.8

申请日：2015-06-30

申请人： Voxalytic GmbH ,  Albert-Ludwigs-Universität Freiburg

发明人： Funk, Jörg Michael ,  While, Peter Thomas ,  Spengler, Nils ,  Korvink, Jan Gerrit

IPC分类号： G01R33/36 ,  H01Q1/00

CPC分类号： G01R33/36 ,  G01R33/34 ,  G01R33/3642

摘要： A passive magnetic flux focusing element comprising electrically conductive wires (1) or faces (2) containing an outer area defined by an outer (3), an inner (4) and connecting edges (5) forming a closed current loop enclosing a surface area penetrated by a time varying magnetic field flux and through induction sets up a time varying electrical current in the conducting loop thereby achieving a counter magnetic field to the penetrating field completely canceling the penetrating field in the interior of the loop, the inner edge being shaped so as to guide the induced current in the opposite sense to the outer edge, thereby setting up a field flux in the same sense as the penetrating flux but of an increased intensity, whereby the resulting field flux is focused to an area enclosed by the inner edge, is characterized in that the element is part of an RF volume- or surface-coil arrangement adapted for receiving and/or transmitting RF signals. Such elements increase the sensitivity and the SNR in MRI and MR spectroscopy experiments due to an increased magnetic flux density by means of Lenz lenses, in combination with a conventional probe.

摘要翻译： 一种无源磁通聚焦元件，包括导电线（1）或包含由外部（3），内部（4）和连接边缘（5）限定的外部区域的面（2），所述外部区域形成闭合电流环，所述闭合电流环包围表面积 穿过时变磁场通量并且通过感应设置导通环路中的时变电流，从而实现对穿透场的反磁场，完全抵消环内部的穿透场，内边缘成形为 为了引导与外边缘相反意义的感应电流，从而设置与穿透通量相同的感应强度但具有增加的强度的场通量，由此所得的场通量聚焦到由内边缘包围的区域 的特征在于该元件是适于接收和/或发送RF信号的RF体积或表面线圈装置的一部分。 与常规探针组合，由于通过Lenz透镜增加的磁通密度，这些元件增加了MRI和MR光谱实验中的灵敏度和SNR。

公开(公告)号：EP3084457A2

公开(公告)日：2016-10-26

申请号：EP14812737.6

申请日：2014-12-16

申请人： Koninklijke Philips N.V.

发明人： VERNICKEL, Peter ,  LIPS, Oliver ,  FINDEKLEE, Christian

IPC分类号： G01R33/28 ,  G01R33/36 ,  G01R33/561 ,  G01R33/565

CPC分类号： G01R33/36 ,  G01R33/288 ,  G01R33/3642 ,  G01R33/5612 ,  G01R33/5659

摘要： A radio frequency antenna device (30) for use in a magnetic resonance imaging system (10), the magnetic resonance imaging system (10) being configured for acquiring magnetic resonance images of at least a portion of a subject of interest (20); the radio frequency antenna device (30) comprising - at least one radio frequency antennae (32) that is configured for being fed with radio frequency power from at least one radio frequency channel and for applying a radio frequency field B to nuclei of or within the portion of the subject of interest (20) for magnetic resonance excitation, - at least one pickup circuit (46), including an electric or electronic device having a non-linear current-voltage characteristic, - wherein the at least one pickup circuit (46) is configured to provide a trigger signal (56) upon a transfer of the electric or electronic device between a state of high impedance and a state of low impedance, the trigger signal (56) being exploitable for shutting down a supply of radio frequency power to the at least one radio frequency antenna (32) that is magnetically coupled to the at least one inductor (48); a method of operating a magnetic resonance imaging system (10) in a safe manner with regard to effects of emitted radio frequency power; and a method of operating a magnetic resonance imaging system (10) with regard to calibration of a magnitude of an emitted radio frequency magnetic field B
1 .

公开(公告)号：EP2992350A1

公开(公告)日：2016-03-09

申请号：EP14726201.8

申请日：2014-04-22

申请人： Koninklijke Philips N.V.

发明人： DUENSING, George Randall ,  FRIMAN, Olli

IPC分类号： G01R33/34 ,  G01R33/36 ,  G01R33/3415

CPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/34007 ,  G01R33/34084 ,  G01R33/3415 ,  G01R33/36 ,  G01R33/3642

摘要： A local magnetic resonance (MR) radio frequency (RF) coil includes a plurality of housing sections that are separable and configured with mating surfaces that meet and engage each other to form an opening which receives a portion of subject anatomy for magnetic resonance imaging, a detachable connector, and a cable. Each housing section includes coil elements enclosed within each housing section which receive MR signals from the received portion of the subject anatomy, and external connectors connected to the coil elements co-located on an outside surface of each housing section and adjacent to the mating surfaces. The detachable connector connects to the external connectors of the housing sections. The cable conveys at least the received MR signals received by the coil elements..

公开(公告)号：EP2734855A2

公开(公告)日：2014-05-28

申请号：EP12750814.1

申请日：2012-07-05

申请人： Koninklijke Philips N.V.

发明人： REYKOWSKI, Arne

IPC分类号： G01R33/36 ,  G01R33/561 ,  G01R33/565

CPC分类号： G01R33/36 ,  G01R33/3628 ,  G01R33/3642 ,  G01R33/3692 ,  G01R33/5612 ,  G01R33/5659

摘要： A local radio frequency (RF) transmitting coil (26) of a magnetic resonance imaging system (5) has a plurality of coil elements (100). Each coil element (100) has an adjustable load (62) which is adjusted by a control unit (60) to adjust a transmitted B
1 field distribution. The load can be adjusted to shim for a uniform B
1 field distribution. Non-uniform B
1 field distributions can be selected to perform magnetic resonance sequences that use such B
1 field distributions, such as parallel imaging. The B
1 field distribution can be changed during the magnetic resonance sequence to track a moving region of interest, time division multiplex parallel imaging, and the like.

公开(公告)号：EP2733500A1

公开(公告)日：2014-05-21

申请号：EP13004911.7

申请日：2013-10-14

申请人： Krohne AG

发明人： Hofstede, Jan Johannes Jacobus ,  Bergkamp, Erwin Johannes Gerardus

IPC分类号： G01R33/36 ,  G01F1/716 ,  G01F1/74 ,  G01N24/08

CPC分类号： G01R33/56 ,  G01N24/08 ,  G01R33/3621 ,  G01R33/3642

摘要： Dargestellt und beschrieben ist ein Messsystem (1) für kemmagnetische Messgeräte mit einer Steuerung (2), einem Signalgenerator (3) zum Erzeugen und Ausgeben von elektrischen Anregungssignalen und einer Signalverarbeitung (4) mit einer Eingangsstufe (5) und einer auf die Eingangsstufe (5) im Signalpfad der Signalverarbeitung (4) folgenden Signalkonditionierung (6) zur Verarbeitung der von den Anregungssignalen hervorgerufenen und am Eingang der Eingangsstufe (5) eingehenden elektrischen Messsignale, wobei auch von den Anregungssignalen hervorgerufene und nicht zeitgleich mit den Messsignalen auftretende Störsignale am Eingang der Eingangsstufe (5) eingehen, der Signalhub der Messsignale kleiner ist als der Signalhub der Störsignale und die Steuerung (2) die Zeitpunkte des Ausgebens der Anregungssignale bestimmt.
Ein Messsystem (1), das eine Anpassung des von der Signalverarbeitung (4) verarbeitbaren maximalen Signalhubs an den maximalen Signalhub der von den Anregungssignalen hervorgerufenen Messsignale ermöglicht, wird dadurch realisiert, dass im Signalpfad der Signalverarbeitung (4) zwischen dem Ausgang der Eingangsstufe (5) und dem Eingang der Signalkonditionierung (6) ein Schalter (7) angeordnet ist, der Schalter (7) durch die Steuerung (2) in einen ersten Schaltzustand I und einen zweiten Schaltzustand II schaltbar ist, im ersten Schaltzustand I das Signal am Ausgang der Eingangsstufe (5) an den Eingang der Signalkonditionierung (6) geleitet ist und im zweiten Schaltzustand II das Signal am Ausgang der Eingangsstufe (5) nicht an den Eingang der Signalkonditionierung (6) geleitet ist, dass die Steuerung (2) ausgebildet ist, den Schalter (7) nur in den Zeiträumen in den ersten Schaltzustand I zu schalten, in denen keine Störsignale am Eingang der Eingangsstufe (5) anliegen, und dass der Aussteuerbereich des Eingangs der Signalkonditionierung (6) an den Spannungshub der Messsignale angepasst ist.

摘要翻译： 系统（1）具有用于产生电激励信号的信号发生器（3）和用于处理测量信号的信号处理器（4）。 开关（7）布置在输入级（5）的输出端和信号调节器（6）的输入端之间。 控制器（2）将开关切换到将输入级的输出端的信号传递到信号调理器的输入端的状态，以及信号不被传递给信号调节器的输入端的状态。 调节器输入的动态范围适用于测量信号的电压偏差。

公开(公告)号：EP1877835A4

公开(公告)日：2012-04-11

申请号：EP06750335

申请日：2006-04-14

申请人： CORNELL RES FOUNDATION INC

发明人： BALLON DOUGLAS J ,  VOSS HENNING U

IPC分类号： G01V3/00 ,  G01R33/34 ,  G06K19/07 ,  G06K19/077

CPC分类号： G01R33/34046 ,  G01R33/34007 ,  G01R33/34053 ,  G01R33/3415 ,  G01R33/3642 ,  G01R33/3678 ,  G06K19/0672

摘要： A high-pass two-dimensional ladder network has been described for high-field MRI and credential applications. The next-to-highest eigenvalue of the network corresponds to a normal mode giving rise to B1 fields with good spatial homogeneity above the resonator plane. Other eigenvalues may also be used for specific imaging applications. In its most basic form, the ladder network is a collection of inductively coupled resonators where each element of the array is represented by at least one conducting strip having a self-inductance L, joined by a capacitor C at one or more points along each resonator. In the strong coupling limit of the inductively coupled high-pass two-dimensional ladder network resonator array, the array produces a high-frequency resonant mode that can be used to generate the traditional quadrature B1 field used in magnetic resonance imaging, and in the limit of weak or zero coupling reduces to a phased array suitable for parallel imaging applications.

摘要翻译： 已经描述了高通二维梯形网络用于高场MRI和证书应用。 网络的下一个最高特征值对应于正常模式，产生具有高于谐振器平面的良好空间均匀性的B1场。 其他特征值也可用于特定成像应用。 在其最基本的形式中，梯形网络是电感耦合谐振器的集合，其中阵列的每个元件由至少一个具有自感L的导电带表示，其中电感器L沿着每个谐振器在一个或多个点处由电容器C连接 。 在电感耦合高通二维梯形网络谐振器阵列的强耦合极限中，该阵列产生高频谐振模式，可用于产生磁共振成像中使用的传统正交B1场，并在极限 弱耦合或零耦合减少到适用于并行成像应用的相控阵列。

公开(公告)号：EP1811898A4

公开(公告)日：2009-11-11

申请号：EP05856978

申请日：2005-11-15

申请人： MEDRAD INC

发明人： MISIC GEORGE J

IPC分类号： A61B5/05 ,  G01V3/00

CPC分类号： A61B5/055 ,  A61B5/6856 ,  G01R33/34 ,  G01R33/34084 ,  G01R33/34092 ,  G01R33/3415 ,  G01R33/3628 ,  G01R33/3642

摘要： An interface device (300) for interfacing an intracavity probe comprises a magnetic resonance system (10) having a receive cycle and a transmit cycle of operation, said intracavity probe having a coil loop and a pair of output cables terminating in a connector therefor for connecting said coil loop to said interface device (300), said interface device (300) comprising: (a) a connector (303) to which said intracavity probe is connectable via said connector thereof; (b) a phase shifting network (310) linked to said connector (303), said phase shifting network (310) having first and second sub-networks (320,330) to which a first and a second of said output cables are joined, respectively, when said connectors (303) of said intracavity probe and said interface device (300) are connected, each of said output cables connected at the other end thereof across a drive capacitor in said coil loop and having an electrical length of S L + n(»/4) wherein S L is a supplemental length whose reactance is of a same magnitude as a reactance of said drive capacitor corresponding thereto, n is an odd integer and » is a wavelength of the operating frequency of said magnetic resonance system (10); and (c) a pair of PIN diodes (33) of which a first PIN diode is connected across an output of said first sub-network (320) and a second PIN diode is connected across an output of said second sub-network (330) such that an electrical length of each of said first and said second sub-networks (320,330) from said connector of said interface device (300) to said PIN diode corresponding thereto is »/4; wherein when said connectors (303) of said intracavity probe and said interface device (300) are connected, said phase shifting network (310) enables said coil loop (i) during said receive cycle when said PIN diodes (33) are reversed biased to be coupled through said output cables to a probe input port of said magnetic resonance system (10) thus allowing magnetic resonance signals received from each of said output cables to be constructively combined and routed to said probe input port and (ii) during said transmit cycle when said PIN diodes (33) are forward biased to be decoupled from a transmit field of said magnetic resonance system (10) via a combined electrical length of S L + n(»/2) of each of said output cables and said sub-network (320,330) corresponding thereto ( Fig. 16 ).

摘要翻译： 的接口设备（300），用于连接到腔内探测头包括具有接收周期的磁共振系统（10）和操作的发射周期中，具有在连接器为此用于连接线圈回路和一对输出电缆端接的。所述腔内探头 所述线圈回路到所述接口设备（300），所述接口装置（300）包括：（A）的连接器（303）有所述腔内探针是经由所述连接器可连接其; 连接到所述连接器（303）（B）一个移相网络（310），所述移相网络（310）具有第一和第二子网络（320.330）到其上第一和所述输出电缆的第二分别接合， 当所述腔内探测头和所述接口装置（300）的所述连接器（303）相连接，每一个在其两端在所述线圈回路的驱动电容器的另一端连接，并且具有到SL的电长度与所述输出电缆的+ N（ »/ 4）worin SL是补充长度谁的电抗是一个相同的大小，所述驱动电容器的与其对应的电抗，n是一个奇整数并且”是所述磁共振系统的工作频率（10）的波长; 和（c）一对PIN二极管（33）的第一PIN二极管跨在所述第一子网络（320）和第二PIN二极管的输出端连接跨在所述第二子网络的输出（330连接 （）搜索做到每个第一和所述的的电气长度从所述接口设备（300）向所述PIN二极管的所述连接器的第二子网络320.330）与其对应的为“/ 4; 的说腔内探测头和所述接口装置（300）相连接，当所述PIN二极管（33）反向偏置到所述相期间所述移网络（310）使所述线圈回路（i）接收周期worin当所述连接器（303） 通过所述输出电缆被耦合到所述的磁共振系统的样品输入端口（10），从而允许从每个所述输出电缆被建设性地组合并选择路由至所述探头输入端口和（ii）期间，所述发射周期接收的磁共振信号 当所述PIN二极管（33）被正向偏置被从所述磁共振系统（10）的发射字段解耦经由SL的每个所述输出线和所述子网络中的一个组合的电长度+ N（“/ 2） （320.330）与其对应的（图16）。

公开(公告)号：EP1882191A1

公开(公告)日：2008-01-30

申请号：EP06727663.4

申请日：2006-03-13

申请人： Koninklijke Philips Electronics N.V. ,  Weiss, Steffen

发明人： WEISS, Steffen

IPC分类号： G01R33/34

CPC分类号： G01R33/3692 ,  G01R33/34046 ,  G01R33/3628 ,  G01R33/3642

摘要： A magnetic resonance imaging system (10) includes a transmit coil (22) and one or more receive coils (32). The transmit coil includes one or more circuit segments (44, 44, 80, 90) including a light-sensitive metal-insulator-semiconductor capacitor (50) which is connected by an optic fiber to one of a plurality of variable light sources (68). In the set-up mode, the transmit coil transmits RF pulses into an examination region (14). A plurality of the receive coils are disposed around the imaging region. The tuning processor (60) analyzes the received RF fields from around the imaging region and determines adjustments to the amount of light transmitted to each light-sensitive capacitor to shim or tune the transmit coil to optimize RF field homogeneity. Further, the receive coils (32') include a light-sensitive capacitor whose illumination is changed during RF transmission to detune the receive coil.