公开(公告)号：US20240337718A1

公开(公告)日：2024-10-10

申请号：US18745232

申请日：2024-06-17

申请人： Washington University ,  Oregon Health and Science University

发明人： Nico Dosenbach ,  Jonathan Koller ,  Andrew Van ,  Abraham Snyder ,  Amy Mirro ,  Damien Fair ,  Eric Earl ,  Rachel Klein ,  Oscar Miranda Dominguez ,  Anders Perrone

IPC分类号： G01R33/565 ,  A61B5/055 ,  G01R33/00 ,  G01R33/483 ,  G01R33/56

CPC分类号： G01R33/56509 ,  A61B5/055 ,  G01R33/0041 ,  G01R33/4831 ,  G01R33/5608

摘要： Methods, computer-readable storage devices, and systems are described for reducing movement of a patient undergoing a magnetic resonance imaging (MRI) scan. One method includes receiving a data frame from the MRI system performing the MRI scan of the patient, comparing the data frame to a reference image to assess motion of a body part of the patient during the MRI scan, generating stimulus to be communicated to the patient during the MRI scan based on a task of the MRI scan and the motion of the body part of the patient during the MRI scan, adjusting the stimulus during the MRI scan to adjust the task and as the motion of the body part of the patient changes, and communicating the stimulus to the patient during the MRI scan, wherein the sensory feedback includes at least one of a game, a movie, a cartoon, a shape, or an auditory signal.

公开(公告)号：US09575204B2

公开(公告)日：2017-02-21

申请号：US14377813

申请日：2012-02-08

申请人： Songhua Chen ,  Ron Charles Balliet

发明人： Songhua Chen ,  Ron Charles Balliet

IPC分类号： G01V3/00 ,  G01V3/32 ,  E21B17/10 ,  G01R33/483 ,  G01R33/26

CPC分类号： G01V3/32 ,  E21B17/1021 ,  G01R33/26 ,  G01R33/4831

摘要： Various disclosed nuclear magnetic resonance (NMR) logging systems and methods employ a plurality of NMR sensors, including atomic magnetometers, mounted on pads. Certain method embodiments include: utilizing the Earth magnetic field to pre-polarize the protons in a formation; utilizing a plurality of atomic magnetometers to obtain NMR measurements; and determining at least one characteristic relaxation time of the formation. The NMR sensor may optionally include a permanent magnet assembly.

摘要翻译： 各种公开的核磁共振（NMR）测井系统和方法使用安装在焊盘上的多个NMR传感器，包括原子磁强计。 某些方法实施例包括：利用地球磁场对地层中的质子进行预极化; 利用多个原子磁强计获得NMR测量; 以及确定所述地层的至少一个特征弛豫时间。 NMR传感器可以可选地包括永磁体组件。

公开(公告)号：US20160313424A1

公开(公告)日：2016-10-27

申请号：US15101166

申请日：2013-12-02

申请人： Northwestern University

发明人： Todd Parrish

IPC分类号： G01R33/50 ,  G01R33/563

CPC分类号： G01R33/50 ,  A61B5/055 ,  G01R33/4816 ,  G01R33/4818 ,  G01R33/482 ,  G01R33/4822 ,  G01R33/4824 ,  G01R33/4826 ,  G01R33/4828 ,  G01R33/483 ,  G01R33/4831 ,  G01R33/4833 ,  G01R33/4835 ,  G01R33/4836 ,  G01R33/4838 ,  G01R33/543 ,  G01R33/5601 ,  G01R33/5602 ,  G01R33/56366 ,  G01R33/5676

摘要： Described here are systems and methods for obtaining measurements of both tissue perfusion and permeability with a magnetic resonance imaging (“MRI”) system after the administration of a single dose of contrast agent. To this end, the MRI system is directed to acquire T2*-weighted data, during which the acquired signal values are monitored for a trigger event. When the trigger event occurs, the MRI system is directed to switch from acquiring the T2*-weighted data to acquiring T1-weighted data. The systems and methods of the present invention can thus be used for a fully automated, single acquisition of perfusion and permeability measurements using only a single dose of contrast agent.

摘要翻译： 这里描述了在施用单剂量的造影剂之后用磁共振成像（“MRI”）系统获得组织灌注和渗透性测量的系统和方法。 为此，MRI系统旨在获取T2 *加权数据，在此期间监视所获取的信号值以获得触发事件。 当触发事件发生时，MRI系统被指示从获取T2加权数据到获取T1加权数据。 因此，本发明的系统和方法可以用于仅使用单剂量造影剂的全自动单次采集灌注和渗透性测量。

公开(公告)号：US20150241532A1

公开(公告)日：2015-08-27

申请号：US14630973

申请日：2015-02-25

申请人： Siemens Aktiengesellschaft

发明人： Radhouene Neji ,  Christian Schuster

IPC分类号： G01R33/46 ,  G01R33/48 ,  G01R33/483 ,  G01R33/385

CPC分类号： G01R33/4616 ,  G01R33/385 ,  G01R33/4828 ,  G01R33/4831 ,  G01R33/485 ,  G01R33/565

摘要： In a method and magnetic resonance (MR) apparatus for acquiring an MR signal from an examination subject according to a pulse sequence, a first radio-frequency pulse is applied with a first phase and a gradient field is simultaneously applied in a first direction. Second and third radio-frequency pulses, with second and third phases, respectively, are applied simultaneously with a gradient field in a second direction. A fourth and a fifth radio-frequency pulse, with a fourth and a fifth phase, respectively, are applied and simultaneously with a gradient field in a third direction. A signal with a receiver phase is acquired =. The pulse sequence is repeated a number of times under phase rotation, wherein the third and fourth radio-frequency pulses in each repetition have the same phase, and the signals acquired in the repetition are added.

摘要翻译： 在用于根据脉冲序列从检查对象获取MR信号的方法和磁共振（MR）装置中，以第一相位施加第一射频脉冲，并且沿第一方向同时施加梯度场。 分别具有第二和第三相的第二和第三射频脉冲与第二方向上的梯度场同时施加。 分别施加第四和第五相的第四和第五射频脉冲，并与第三方向上的梯度场同时施加。 获取具有接收器相位的信号=。 脉冲序列在相位旋转下重复多次，其中每个重复中的第三和第四射频脉冲具有相同的相位，并且添加在重复中获取的信号。

公开(公告)号：US09086446B2

公开(公告)日：2015-07-21

申请号：US13306577

申请日：2011-11-29

申请人： Rolf Feodor Schulte ,  Laura Irene Sacolick ,  William Allyn Grissom ,  Pekka Tapani Sipilä

发明人： Rolf Feodor Schulte ,  Laura Irene Sacolick ,  William Allyn Grissom ,  Pekka Tapani Sipilä

IPC分类号： G01R33/24 ,  G01R33/48 ,  G01R33/483

CPC分类号： G01R33/246 ,  G01R33/4824 ,  G01R33/4831

摘要： A method of B1 field mapping relating to Magnetic resonance imaging (MRI) is given. In the method, RF and gradients are applied to excite and select a linear projection through a volume of interest; a radio frequency pulse sequence is transmitted to impart B1 dependent phase to the linear projection, following which a one dimensional spatial encoding signal is acquired along the linear projection; Subsequently a B1 field map based on the one dimensional spatial encoding signal is reconstructed.

摘要翻译： 给出了与磁共振成像（MRI）相关的B1场映射的方法。 在该方法中，应用RF和梯度来激发并选择通过感兴趣的体积的线性投影; 发送射频脉冲序列以将B1相关相位提供给线性投影，随后沿着线性投影获取一维空间编码信号; 随后重建基于一维空间编码信号的B1场地图。

公开(公告)号：US20150102810A1

公开(公告)日：2015-04-16

申请号：US14511609

申请日：2014-10-10

申请人： Siemens Aktiengesellschaft

发明人： David Grodzki ,  Bjorn Heismann

IPC分类号： G01R33/56 ,  A61B5/145 ,  G01R33/385

CPC分类号： G01R33/5601 ,  A61B5/004 ,  A61B5/055 ,  A61B5/145 ,  G01R33/3415 ,  G01R33/385 ,  G01R33/4831 ,  G01R33/5635

摘要： In a method and apparatus to create at least one magnetic resonance image data set in particular angiographic image data sets, first magnetic resonance image data are acquired using a first projection acquisition sequence, second magnetic resonance image data are acquired after administration of contrast agent, using a second projection acquisition sequence, and at least one magnetic resonance image data set is created using the first magnetic resonance image data and the second magnetic resonance image data.

摘要翻译： 在特别是血管造影图像数据集中创建至少一个磁共振图像数据集的方法和装置中，使用第一投影获取序列获取第一磁共振图像数据，在施用造影剂之后获取第二磁共振图像数据，使用 使用第一磁共振图像数据和第二磁共振图像数据来创建第二投影获取序列和至少一个磁共振图像数据集。

公开(公告)号：US20100026299A1

公开(公告)日：2010-02-04

申请号：US12449822

申请日：2008-05-02

申请人： Scott King ,  Jonathan Sharp

发明人： Scott King ,  Jonathan Sharp

IPC分类号： G01R33/44 ,  G01R33/28

CPC分类号： G01R33/3415 ,  G01R33/34061 ,  G01R33/482 ,  G01R33/4831 ,  G01R33/5612 ,  G01R33/5617

摘要： Accumulated spin magnetization phase within a RF MRI procedure can be used for providing an orderly k-space traversal. By operating a transmit array adapted to produce two B1 fields in alternation, where the B1 fields are substantially uniform in amplitude over a sample volume of the MRI setup, and the B1 fields have respective spatial phase distributions such that selection of a difference in spatial derivatives of the spatial phase distributions permits control over a size of a step in k-space applied by successive refocusing pulses for generating the B1 fields in alternation. Each alternating refocusing pulse issued within a T2 time causes a step through k-space in an encoding direction determined by the difference in spatial derivatives.

摘要翻译： RF MRI程序内的累积自旋磁化相可用于提供有序的k空间遍历。 通过操作适于产生交替的两个B1场的发射阵列，其中B1场在MRI设置的采样体积上幅度基本上均匀，并且B1场具有相应的空间相位分布，使得选择空间导数的差异 的空间相位分布允许通过连续重聚焦脉冲施加的k空间中的步长的尺寸​​的控制，以便交替地生成B1场。 在T2时间内发出的每个交替重聚焦脉冲在由空间导数的差异确定的编码方向上产生通过k空间的步长。

公开(公告)号：US20100016708A1

公开(公告)日：2010-01-21

申请号：US12446661

申请日：2007-10-31

申请人： Ulrich Katscher ,  Peter Vernikel ,  Peter Boernert

发明人： Ulrich Katscher ,  Peter Vernikel ,  Peter Boernert

IPC分类号： A61B5/055

CPC分类号： G01R33/4831 ,  G01R33/3415

摘要： A common method of RF encoding assumes that the Bi field generated by the RF coils is linear, which is likely not the case in many situations. It is therefore desirable to have a method of operating an MR system to reconstruct an image of a subject, wherein the method is capable of also handling arbitrary Bi fields used for RF encoding. Accordingly, such an MR system employing one or more RF coils is disclosed herein. The method comprises obtaining transmit sensitivities and weighting factors for individual RF coils. Each RF coil is activated based on its respective weighting factor to apply RF excitation to a subject under examination in the MR system. MR signals—such as free induction decays (FID) signals or echo signals—generated from the subject in response to the RF excitation are received and processed based on the transmit sensitivities to generate an MR image or spectrum representative of the subject.

摘要翻译： RF编码的常见方法假设由RF线圈产生的Bi场线是线性的，这在许多情况下可能不是这种情况。 因此，期望具有操作MR系统以重建对象的图像的方法，其中该方法还能够处理用于RF编码的任意Bi字段。 因此，本文公开了采用一个或多个RF线圈的这种MR系统。 该方法包括获得单个RF线圈的发射灵敏度和加权因子。 每个RF线圈基于其相应的加权因子被激活，以将RF激励施加到在MR系统中被检查的受试者。 基于发射灵敏度接收和处理MR信号，例如响应于RF激励从受试者产生的自由感应衰减（FID）信号或回波信号，以产生代表对象的MR图像或频谱。

公开(公告)号：US12050257B2

公开(公告)日：2024-07-30

申请号：US18061254

申请日：2022-12-02

申请人： Washington University ,  Oregon Health and Science University

发明人： Nico Dosenbach ,  Jonathan Koller ,  Andrew Van ,  Abraham Snyder ,  Amy Mirro ,  Damien Fair ,  Eric Earl ,  Rachel Klein ,  Oscar Miranda Dominguez ,  Anders Perrone

IPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/00 ,  G01R33/483 ,  G01R33/565

CPC分类号： G01R33/56509 ,  A61B5/055 ,  G01R33/0041 ,  G01R33/4831 ,  G01R33/5608

摘要： Methods, computer-readable storage devices, and systems are described for reducing movement of a patient undergoing a magnetic resonance imaging (MRI) scan by aligning MRI data, the method implemented on a Framewise Integrated Real-time MRI Monitoring (“FIRMM”) computing device including at least one processor in communication with at least one memory device. Aspects of the method comprise receiving a data frame from the MRI system, aligning the received data frame to a preceding data frame, calculating motion of a body part between the received data frame and the preceding data frame, calculating total frame displacement, and excluding data frames with a cutoff above a pre-identified threshold of the total frame displacement.

公开(公告)号：US09733325B2

公开(公告)日：2017-08-15

申请号：US13991886

申请日：2011-12-06

申请人： Denis Grenier ,  Herve Saint-Jalmes

发明人： Denis Grenier ,  Herve Saint-Jalmes

IPC分类号： G01R33/48 ,  G01R33/483

CPC分类号： G01R33/483 ,  G01R33/4831

摘要： A method and apparatus for characterizing a sample using a nuclear magnetic resonance spectrameter in which an effective field is generated. The field has an effective vector and results from a static magnetic field and a radiofrequency magnetic field. The effective vector rotates relative to a terrestrial reference frame.