公开(公告)号：DE59912103D1

公开(公告)日：2005-07-07

申请号：DE59912103

申请日：1999-01-06

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LUEDEKE KAI-MICHAEL ,  RASCHE DR

IPC: G01R33/32 ,  A61B5/055 ,  G01R33/28 ,  G01R33/34 ,  G01R33/563

Abstract: The method involves stimulating nuclear magnetization in investigation object, in the investigation region using at least one high frequency magnetic pulse. The MR signals received from an MR coil is used for at least one MR image. At least one micro coil tuned to the MR frequency and without connecting leads is inserted into the object under investigation, and the MR signals are processed so that the local change caused by the micro coil in the magnetic field arising from the HF pulse can be seen in the MR image. An Independent claim is also included for a magnetic resonance arrangement for implementing the method.

公开(公告)号：DE59810995D1

公开(公告)日：2004-04-22

申请号：DE59810995

申请日：1998-12-08

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： LUEDEKE KAI-MICHAEL ,  RASCHE VOLKER DR

IPC: G01R33/36 ,  A61B1/00 ,  A61B5/055 ,  A61B5/06 ,  G01R33/28

Abstract: The invention relates to a magnetic resonance (MR) device which is provided with a medical instrument (10) which is to be introduced into an object (1) to be examined, and also with a coil system (11) which is arranged in or on the instrument (10) and includes at least one coil for receiving and/or transmitting an RF signal, to a medical instrument (10) of this kind and also to a method of determining the position of such a medical instrument (10) that can be introduced into an object (1) to be examined. According to the invention the coil system (11) in an MR device of this kind forms a resonant circuit (20) in conjunction with a capacitor (19) and a modulation unit (12) is provided in order to modulate an RF signal coupled into the coil system (11).

公开(公告)号：DE50011850D1

公开(公告)日：2006-01-19

申请号：DE50011850

申请日：2000-11-16

Applicant: PHILIPS INTELLECTUAL PROPERTY

Inventor： WEISS STEFFEN ,  LUEDEKE KAI-MICHAEL

IPC: G01R33/20 ,  A61B5/055 ,  G01R33/28 ,  G01R33/32 ,  G01R33/48 ,  G01R33/483

Abstract: The invention relates to a method of and a device for exciting the nuclear magnetization in a limited volume of an object to be examined, utilizing a microcoil (L) which is present in the volume and is attached, for example, to an interventional instrument during the formation of a magnetic resonance image of the object to be examined. The excitation of the nuclear magnetization is performed by at least one RF pulse whose frequency spectrum does not overlap the range of the spin resonance spectrum, so that no nuclear magnetization is excited outside the close range of the microcoil in the object to be examined. The microcoil, however, is provided with an active or passive circuit (for example, it is wired together with at least one capacitance (C) and a non-linear component (D1, D2) so as to form a non-linear resonant circuit) which locally generates an RF signal from the RF pulse. The RF signal overlaps the spin resonance frequency and causes excitation of the nuclear magnetization exclusively in the close range of the microcoil. After measurement and appropriate signal processing, this nuclear magnetization is used either to determine the position of the microcoil for reproduction in the MR image of the object to be examined or to form an MR image of the close range of the microcoil. The invention also relates to a medical instrument for use in conjunction with the method.

公开(公告)号：WO2009050650A3

公开(公告)日：2009-07-02

申请号：PCT/IB2008054228

申请日：2008-10-15

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS INTELLECTUAL PROPERTY ,  LUEDEKE KAI-MICHAEL

Inventor： LUEDEKE KAI-MICHAEL

IPC: G01R33/34

CPC classification number: G01R33/34076 ,  G01R33/288 ,  G01R33/34007 ,  G01R33/422

Abstract: A birdcage coil (10) for a magnetic resonance imaging device includes a plurality of rungs (12) coupled to a distal edge (15) of each of two endrings (16). The endrings (16) comprise a plurality of ring segments (18) that are separated by sets of capacitors (20, 22, 24). The rungs (12) are coupled to the endrings (16) by connector portions (14), which create a gap between the endrings (16) and the rungs (12). Additionally, the rungs (12) can be positioned over the capacitors (20, 22, 24), and the connector portions (14) can be shaped to offset the position of the rungs (12) relative to the ring segments (16) to which they are coupled to achieve a desire rung position relative to the capacitors (20, 22, 24).

Abstract translation: 用于磁共振成像设备的鸟笼线圈（10）包括耦合到两个端环（16）中的每一个的远端边缘（15）的多个梯级（12）。 端环（16）包括由电容器组（20,22,24）分开的多个环段（18）。 横档（12）通过连接器部分（14）连接到端环（16），连接器部分（14）在端环（16）和横档（12）之间形成间隙。 另外，横档（12）可以位于电容器（20,22,24）之上，并且连接器部分（14）可以被成形为使梯级（12）相对于环形段（16）至 它们被耦合以实现相对于电容器（20,22,24）的期望梯级位置。

公开(公告)号：WO2008078284A3

公开(公告)日：2008-08-21

申请号：PCT/IB2007055198

申请日：2007-12-18

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS INTELLECTUAL PROPERTY ,  LUEDEKE KAI-MICHAEL ,  LEUSSLER CHRISTOPH

Inventor： LUEDEKE KAI-MICHAEL ,  LEUSSLER CHRISTOPH

IPC: G01R33/34 ,  G01R33/422 ,  H01Q15/00

CPC classification number: G01R33/341 ,  G01R33/422 ,  H01Q15/0086 ,  H01Q21/065

Abstract: An RF coil is proposed for use as an RF antenna for a MR imaging system, for transmitting RF excitation signals and for receiving MR relaxation signals. The RF coil of the invention includes an array of patches (1) which are capacitively coupled with each other. The array of patches forms a resonant surface on which surface currents can be resonantly excited for generating at least one field modus.

Abstract translation: RF线圈被提出用作用于MR成像系统的RF天线，用于发射RF激励信号和用于接收MR松弛信号。 本发明的RF线圈包括彼此电容耦合的贴片阵列（1）。 贴片阵列形成谐振表面，表面电流可以共振地激发，以产生至少一个场模。

公开(公告)号：WO2006067703A3

公开(公告)日：2006-09-21

申请号：PCT/IB2005054267

申请日：2005-12-15

Applicant: KONINKL PHILIPS ELECTRONICS NV ,  PHILIPS INTELLECTUAL PROPERTY ,  GLEICH BERNHARD ,  VERNICKEL PETER ,  WEISS STEFFEN ,  LUEDEKE KAI-MICHAEL

Inventor： GLEICH BERNHARD ,  VERNICKEL PETER ,  WEISS STEFFEN ,  LUEDEKE KAI-MICHAEL

IPC: G01R33/36

CPC classification number: G01R33/287 ,  G01R33/3642 ,  G01R33/3685

Abstract: A transmission path (13) for transmitting high frequency (RF) signals is disclosed, which comprises a plurality of lead segments (20, 21, 22) which are coupled to one another on one end by a capacitive coupling element (30) and on the other end by an inductive coupling element (31) and which each have an effective length of approximately ? i /4, wherein ? i is the wavelength of a differential mode signal to be transmitted over the path (13). By providing these element (30, 31) in the form of distributed elements which electrically extend over at least a part of adjacent lead segments (20, 21; 21, 22) a very thin transmission path (13) can be realized, which is especially suitable for use with invasive catheters. Furthermore, this path (13) can be guided through RF fields of a magnetic resonance (MR) imaging system because common mode resonances are effectively suppressed.

Abstract translation: 公开了一种用于传输高频（RF）信号的传输路径（13），其包括多个引线段（20,21,22），其在一端通过电容耦合元件（30）彼此耦合并且接通 另一端由电感耦合元件（31）并且每一个具有大约π/Λ4的有效长度，其中Δλ是差模信号的波长 通过路径（13）传送。 通过将这些元件（30,31）设置成在相邻引线段（20,21; 21,22）的至少一部分上电延伸的分布元件的形式，可以实现非常薄的传输路径（13） 特别适用于侵入性导管。 此外，由于共模谐振被有效地抑制，所以该路径（13）可以被引导到磁共振（MR）成像系统的RF场。