公开(公告)号：EP3749973B1

公开(公告)日：2024-09-25

申请号：EP19750909.4

申请日：2019-02-07

IPC分类号： G01R33/24 ,  G01R33/16 ,  G01R33/56 ,  G06T11/00 ,  G01R33/565 ,  G06N3/02 ,  G06N3/08

CPC分类号： G01R33/5608 ,  G01R33/243 ,  G01R33/16 ,  G01R33/56536 ,  G06T7/0012 ,  G06T2207/1008820130101 ,  G06T2207/2008420130101 ,  G06T2207/2008120130101 ,  G06T2207/3001620130101 ,  G06T2207/2001620130101 ,  A61B5/055 ,  G06N3/08 ,  A61B5/245 ,  A61B5/7267 ,  G01R33/56 ,  G06N3/045

公开(公告)号：EP3256871A1

公开(公告)日：2017-12-20

申请号：EP16701816.7

申请日：2016-01-29

申请人： Koninklijke Philips N.V.

发明人： HEY, Silke

IPC分类号： G01R33/565 ,  G01R33/483 ,  G01R33/561

CPC分类号： G01R33/56536 ,  G01R33/4835 ,  G01R33/561

摘要： The invention provides for a magnetic resonance imaging system. Instructions cause a processor (136) controlling the magnetic resonance imaging system to modify (200) pulse sequence data by omitting at least some of the phase encodings (408) that encode for volumes outside of the field of view. The pulse sequence data specifies the acquisition of a stack (128) of two dimensional slices of a field of view (126). The pulse sequence data further specifies phase encoding in a direction (130) perpendicular to the two dimensional slices. The pulse sequence data specifies a maximum SEMAC factor (400). The maximum SEMAC factor specifies a maximum number of phase encoding steps in the perpendicular direction for each of the two dimensional slices. The instructions further cause the processor to determine (202) a slice SEMAC factor for each of the stack of two dimensional slices. The slice SEMAC factor is determined by counting the phase encoding steps that encode for regions within the field of view. The instructions further cause the processor to modify (204) the pulse sequence data by dividing the stack of two dimensional slices into multiple packages (502, 504). Slices within each of the multiple packages are ordered using an outer linear profile in the perpendicular direction. The stack of two dimensional slices are divided into the multiple packages by grouping slices which have a slice SEMAC factor within a predetermined range. Each of the multiple packages is acquired as a series of pulse sequence repetitions. The instructions further cause the processor to modify (206) the pulse sequence data by reordering the profile order of a package to remove at least some of the phase encodings outside of the field of view.

公开(公告)号：EP2689262B1

公开(公告)日：2016-04-13

申请号：EP12703423.9

申请日：2012-01-05

申请人： Medizinische Universität Wien

发明人： ROBINSON, Simon

IPC分类号： G01R33/565

CPC分类号： G01R33/565 ,  G01R33/56536 ,  G01R33/56563

公开(公告)号：EP2708909A2

公开(公告)日：2014-03-19

申请号：EP13183095.2

申请日：2013-09-05

申请人： Samsung Electronics Co., Ltd. ,  Korea Advanced Institute of Science and Technology

发明人： Jo, Jae-moon ,  Park, Hyun-wook ,  Lee, Yoo-jin ,  Han, Ye-Ji

IPC分类号： G01R33/56 ,  G01R33/565

CPC分类号： G01R33/56 ,  G01R33/5608 ,  G01R33/56536 ,  G01R33/56545

摘要： A method of generating a susceptibility weighted image of an object in a magnetic resonance imaging (MRI) apparatus includes: acquiring at least one first complex data piece corresponding to a radio frequency (RF) signal received from the object by using the RF signal; applying a predetermined filter to the at least one first complex data piece to acquire at least one second complex data piece; generating a susceptibility weighted mask by using the at least one second complex data piece; and applying the susceptibility weighted mask to an MRI image of the object to generate the susceptibility weighted image.

摘要翻译： 一种在磁共振成像（MRI）装置中产生物体的敏感度加权图像的方法包括：通过使用RF信号获取与从对象接收的射频（RF）信号相对应的至少一个第一复数数据片; 对所述至少一个第一复数数据块应用预定的滤波器以获取至少一个第二复数数据块; 通过使用所述至少一个第二复数数据块来产生磁敏度加权掩码; 以及将所述敏感度加权掩模应用于所述对象的MRI图像以生成所述敏感性加权图像。

公开(公告)号：EP2686696A1

公开(公告)日：2014-01-22

申请号：EP12705452.6

申请日：2012-02-14

申请人： Koninklijke Philips N.V.

发明人： DEN HARDER, Johan Michiel ,  BOS, Clemens ,  BLUME, Ulrike Andrea

IPC分类号： G01R33/48 ,  G01R33/565 ,  G01R33/44

CPC分类号： G01R33/543 ,  G01R33/445 ,  G01R33/56536 ,  G01R33/56563

摘要： The invention relates to magnetic resonance imaging in the vicinity of a metallic object (like, for instance, a metal implant) where severe spatial perturbations of the static magnetic field occur. In order to suppress the back-folding of distant off-resonant signals into the region of interest, the imaging volume is spatially restricted by means of selection gradients applied concurrently with the excitation and the refocusing RF pulses in a spin echo sequence. The selection gradient applied during the excitation pulse has an amplitude and/or a polarity different from that of the selection gradient applied during the refocusing pulse so that the respectively selected slices in an off-resonance frequency versus spatial coordinate diagram become tilted with respect to one another. The applied imaging technique may of the SEMAC or MAVRIC type and may incorporate compressed sensing, parallel imaging, fat suppression and/or SVD-based noise reduction.

公开(公告)号：EP2369987A1

公开(公告)日：2011-10-05

申请号：EP09829806.0

申请日：2009-11-25

申请人： The U.S.A. As Represented By The Secretary, Department Of Health And Human Services

发明人： SUBRAMANIAN, Sankaran ,  DEVASAHAYAM, Nallathamby ,  MATSUMOTO, Shingo ,  MITCHELL, James, B. ,  CHERUKURI, Murali, Krishna ,  COOK, John, A.

IPC分类号： A61B5/05

CPC分类号： G01R33/60 ,  G01N24/08 ,  G01N24/10 ,  G01R33/4833 ,  G01R33/485 ,  G01R33/50 ,  G01R33/56536 ,  G01R33/56563

摘要： An echo-based single point imaging (ESPI) system (10) providing high-resolution oxygen images of a sample is disclosed. The ESPI system (10) employs spin echo detection of the resonance from a spin probe and concurrent Single Point Imaging (SPI) for spatial encoding of the oxygen concentration within the sample. Images are derived by comparing spin echo intensities of two images reconstructed at two time points selected at identical time intervals on either side of a refocusing pulse, eliminating artifacts associated with sample magnetic susceptibility and field inhomogeneity effects.

公开(公告)号：EP1898228A3

公开(公告)日：2010-09-08

申请号：EP07015695.5

申请日：2007-08-09

申请人： Hitachi, Ltd.

发明人： Takahashi, Masaya ,  Tanaka, Kazuhide ,  Kawasaki, Kenji ,  Shiino, Toshiyuki ,  Okada, Michiya

IPC分类号： G01R33/34

CPC分类号： G01R33/34046 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34053 ,  G01R33/34092 ,  G01R33/56536

摘要： The invention relates to an antenna coil for an NMR probe, wherein the coil is made of a wire rod (1; 11) obtained by combining and integrating two or more kinds of materials (2, 3; 10, 7) having different magnetisms such as diamagnetism and paramagnetism. The wire rod (1; 11) has a circular, rectangular or polygonal cross-sectional shape. The two or more kinds of materials having different magnetisms are combined so that the magnetisms of the combined materials are set off. The wire rod (1; 11) is wound around a bobbin so as to have a solenoid shape. The low-magnetic wire rod (11) preferably comprises superconductive filaments (14) in its outer peripheral portion. The wire rod or the antenna coil is preferably placed in an atmosphere whose temperature has been reduced to 10 K or less. Preferably, a part of the superconductive filaments (14) are exposed on the wire rod surface.

公开(公告)号：EP1779130A1

公开(公告)日：2007-05-02

申请号：EP05781606.8

申请日：2005-08-08

申请人： Philips Intellectual Property & Standards GmbH ,  Koninklijke Philips Electronics N.V.

发明人： DAHNKE, H., c/o Philips I.P. & Standards GmbH ,  SCHAEFFTER, T., c/o Philips I.P. & Standards GmbH

IPC分类号： G01R33/50 ,  G01R33/565

CPC分类号： G01R33/50 ,  G01R33/281 ,  G01R33/56536 ,  G01R33/56563

摘要： The invention relates to an MR method for the quantitative determination of local relaxation time values in an examination volume. Firstly, a plurality of echo signals (1, 2, 3) with different echo time values (t1, t2, t3) are recorded in a phase-sensitive manner. From these echo signals (1, 2, 3), complex MR images (4, 5, 6) are then reconstructed for the different echo time values (t1, t2, t3). Next, local resonant frequency values (7) are calculated for each image point from the echo-time-dependent change in the phases of the complex image values, and then preliminary local magnetic field inhomogeneity values (8) are calculated from the local resonant frequency values (7). The invention proposes that the local relaxation time values (10) be determined from the echo-time-dependent change in the amplitudes of the image values and correction of the local relaxation time values (10) be carried out taking account of final local magnetic field inhomogeneity values. The preliminary magnetic field inhomogeneity values (8) are used as start values for an iterative optimization procedure (19) for determining the final local magnetic field inhomogeneity values.

摘要翻译： 本发明涉及用于定量确定检查体积中的局部弛豫时间值的MR方法。 首先，以相敏方式记录具有不同回波时间值（t1，t2，t3）的多个回波信号（1,2,3）。 从这些回波信号（1,2,3）中，针对不同的回波时间值（t1，t2，t3）重建复杂的MR图像（4,5,6）。 接着，根据复图像值的相位中的与回波时间相关的变化针对每个像点计算局部共振频率值（7），然后根据局部共振频率计算初始局部磁场不均匀性值（8） 值（7）。 本发明提出，局部弛豫时间值（10）由图像值的幅度中与回波时间相关的变化确定，局部弛豫时间值（10）的校正可以考虑最终局部磁场 不均匀性值。 初始磁场不均匀性值（8）被用作用于确定最终局部磁场不均匀性值的迭代优化过程（19）的起始值。

公开(公告)号：EP0975987A1

公开(公告)日：2000-02-02

申请号：EP98957649.1

申请日：1998-11-05

申请人： VARIAN ASSOCIATES, INC.

发明人： ANDERSON, Weston ,  WITHERS, Richard, S.

IPC分类号： G01R33/34

CPC分类号： G01R33/34053 ,  G01R33/34023 ,  G01R33/34061 ,  G01R33/34092 ,  G01R33/56536

摘要： A method and apparatus which utilizes the hysteritic behavior of type II superconductors is provided for reducing the effective magnetic susceptibility of such high temperature superconducting materials being used close to the sample region in nuclear magnetic resonance system probes by providing decaying AC changes in the magnetic field parallel to said superconductive material. The method is particularly applicable to receiver coils reducing the effective magnetic susceptibility of superconducting receiver coils enables the improved sensitivity they inherently provide to be realized without loss of resolution resulting from line broadening caused by susceptibility discontinuities of materials near the sample region of the probe.

公开(公告)号：EP0738897A1

公开(公告)日：1996-10-23

申请号：EP95104449.4

申请日：1995-03-25

申请人： Spectrospin AG

发明人： Marek, Daniel, Dr. ,  Laukien, Frank, Dr. ,  Schett, Oskar, Hr.

IPC分类号： G01R33/34

CPC分类号： G01R33/34069 ,  G01R33/34 ,  G01R33/34023 ,  G01R33/3403 ,  G01R33/34092 ,  G01R33/3635 ,  G01R33/365 ,  G01R33/56536

摘要： Bei einer HF-Empfangsspulenanordnung für NMR-Spektrometer sind mindestens zwei i.w. zueinander orthogonale HF-Empfangsspulensysteme (3a, 3b, 4a, 4b) vorgesehen, von denen mindestens eines aus supraleitendem Material aufgebaut und zumindest teilweise auf eine weit unter Zimmertemperatur liegende kryogene Temperatur gekühlt ist, wobei jedes HF-Empfangsspulensystem aus mindestens einer symmetrisch um eine ungefähr auf Zimmertemperatur oder höherer Temperatur in einem homogenen Magnetfeld befindliche Probe (1) angeordneten Einzelspule besteht, und wobei die HF-Empfangsspulensysteme unterschiedliche radiale Abstände von der Probe (1) aufweisen. Das innere HF-Empfangsspulensystem (3a, 3b) besteht aus einem Material, das andere, von der jeweiligen Betriebstemperatur abhängige physikalische Eigenschaften aufweist als das Material des äußeren HF-Empfangsspulensystems (4a, 4b), wobei die Materialien und die Geometrien der HF-Empfangsspulensysteme so gewählt sind, daß der von sämtlichen HF-Empfangsspulen der Anordnung resultierende Einfluß der Suszeptibilität der HF-Empfangsspulenanordnung bei der kryogenen Betriebstemperatur des supraleitenden HF-Empfangsspulensystems auf die Homogenität des Magnetfeldes im Bereich der Probe (1) minimal ist. Damit kann einerseits die hohe erreichbare Güte der Resonatoranordnung aufgrund des Einsatzes von supraleitendem Material mit hoher elektrischer HF-Leitfähigkeit ausgenutzt werden kann, wobei aber die erheblichen Störeinflüsse der hohen Suszeptibilität des supraleitenden Materials auf die Homogenität des statischen Magnetfelds im Bereich der Meßprobe und damit auf die Linienbreite der empfangenen NMR-Signale vermieden wird.

摘要翻译： 接收线圈包括线圈，其以与室温样品（1）不同的径向距离布置成两个正交组（3a，3b; 4a，4b），有利地在真空（6）中，使得仅一个热去耦壁（ 7）是必需的。 内部线圈（3a，3b）可以由敏感性补偿的Pt型芯线Cu线制成，但是外部线圈（4a，4b）至少是超导的。 敏感性补偿使样品附近的磁场均匀性在低温下最小化系统的变异性。