公开(公告)号：US12007460B2

公开(公告)日：2024-06-11

申请号：US17902081

申请日：2022-09-02

Applicant: Siemens Healthcare GmbH

Inventor： Mario Zeller ,  Kun Zhou ,  Dominik Paul

IPC: G01R33/565 ,  G01R33/54 ,  G01R33/561

CPC classification number: G01R33/56581 ,  G01R33/543 ,  G01R33/5618

Abstract: A method for actuating a magnetic resonance device according to an MR control sequence, wherein the MR control sequence includes a bipolar gradient pulse between an excitation pulse and a first refocusing pulse, and the bipolar gradient pulse induces a defined Maxwell phase and generates a dephasing gradient moment for a readout gradient.

公开(公告)号：US11874355B2

公开(公告)日：2024-01-16

申请号：US17610374

申请日：2020-05-06

Applicant: Siemens Healthcare GmbH

Inventor： Stephan Kannengiesser ,  Thomas Kluge ,  Gregor Körzdörfer ,  Mathias Nittka ,  Josef Pfeuffer ,  Peter Speier

IPC: G01R33/50 ,  G01R33/48 ,  G01R33/56 ,  G01R33/561 ,  G01R33/565

CPC classification number: G01R33/50 ,  G01R33/4806 ,  G01R33/4818 ,  G01R33/5608 ,  G01R33/5618 ,  G01R33/56581

Abstract: Determining parameter values in image points of an examination object in an MR system by an MRF technique. Comparison signal waveforms, established using predetermined recording parameters, and each assigned to predetermined values of the parameters to be determined, are loaded. An image point time series of the examination object is acquired with an MRF recording method such that the acquired image point time series are comparable with the loaded comparison signal waveforms. A signal comparison of a section of the respective signal waveform of the acquired one image point time series is carried out with a corresponding section of loaded comparison signal waveforms to establish similarity values. The values of the parameters to be determined on the basis of the most similar comparison signal waveforms determined are determined, and then stored or output.

公开(公告)号：US20170123029A1

公开(公告)日：2017-05-04

申请号：US15337578

申请日：2016-10-28

Applicant: Siemens Healthcare GmbH

Inventor： Himanshu Bhat ,  Uvo Hoelscher ,  Mario Zeller

IPC: G01R33/483 ,  G01R33/563 ,  G01R33/561

CPC classification number: G01R33/4835 ,  G01R33/5611 ,  G01R33/56341 ,  G01R33/56581

Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data, MR signals are acquired simultaneously from N slices of a subject with an SMS factor of S, the N slices respectively being at different positions from an isocenter of the data acquisition scanner, thereby causing said MR signals to be affected differently by Maxwell terms of magnetic fields that give said MR signals respective signal dephasings that are dependent on the distance of a respective slice from the isocenter. The SMS MR data acquisition sequence is executed with a spacing between each pair of adjacent slices being less than or equal to N/2S. A Maxwell correction algorithm is applied to the acquired k-space data by calculating Maxwell correction gradient moments at an average position between each pair of adjacent slices, thereby generating corrected k-space data wherein the signal dephasing of the MR signals from the N slices is reduced.

公开(公告)号：US20160274207A1

公开(公告)日：2016-09-22

申请号：US15065397

申请日：2016-03-09

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

Inventor： Hiroki KONDO ,  Shinya OZAWA ,  Masaaki UMEDA ,  Yoshimori KASSAI ,  Naoyuki TAKABAYASHI

IPC: G01R33/561 ,  G01R33/34 ,  G01R33/30 ,  G01R33/385

CPC classification number: G01R33/56581 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/56518

Abstract: In one embodiment, an MRI apparatus, includes a static magnetic field magnet configured to generate a static magnetic field, a gradient coil configured to generate a gradient magnetic field, a transmission and reception coil configured to transmit an RF signal and receive a magnetic resonance signal, and processing circuitry. The processing circuitry determines whether or not a prescan for calculating a correction value that corrects a phase error is skippable or reducible based on an imaging condition of a main scan, and executes a scan including at least the main scan in accordance with a result of the determination.

Abstract translation: 在一个实施例中，MRI装置包括被配置为产生静态磁场的静磁场磁体，被配置为产生梯度磁场的梯度线圈，被配置为发射RF信号并接收磁共振信号的发射和接收线圈 ，和处理电路。 处理电路基于主扫描的成像条件来确定用于计算校正相位误差的校正值的预扫描是否可跳过或可缩减，并且根据主扫描的结果执行至少包括主扫描的扫描 决心。

公开(公告)号：US08633693B2

公开(公告)日：2014-01-21

申请号：US12594341

申请日：2008-04-02

Applicant: Louis-Serge Bouchard ,  Alexander Pines ,  Vasiliki Demas

Inventor： Louis-Serge Bouchard ,  Alexander Pines ,  Vasiliki Demas

IPC: G01V3/00

CPC classification number: G01R33/48 ,  G01R33/445 ,  G01R33/483 ,  G01R33/4833 ,  G01R33/56341 ,  G01R33/56581

Abstract: A system and method for Fourier encoding a nuclear magnetic resonance (NMR) signal is disclosed. A static magnetic field B0 is provided along a first direction. An NMR signal from the sample is Fourier encoded by applying a rotating-frame gradient field BG superimposed on the B0, where the BG comprises a vector component rotating in a plane perpendicular to the first direction at an angular frequency ω in a laboratory frame. The Fourier-encoded NMR signal is detected.

Abstract translation: 公开了一种用于傅里叶编码核磁共振（NMR）信号的系统和方法。 沿着第一方向设置静磁场B0。 来自样本的NMR信号通过施加叠加在B0上的旋转帧梯度场BG进行傅里叶编码，其中BG包括在实验室框架中以角频率ω在垂直于第一方向的平面中旋转的矢量分量。 检测傅里叶编码的NMR信号。

公开(公告)号：US07327141B2

公开(公告)日：2008-02-05

申请号：US11551850

申请日：2006-10-23

Applicant: Youngkyoo Jung ,  Yogesh Arvind Jashnani ,  Walter F. Block

Inventor： Youngkyoo Jung ,  Yogesh Arvind Jashnani ,  Walter F. Block

IPC: G01V3/00

CPC classification number: G01R33/58 ,  G01R33/4833 ,  G01R33/565 ,  G01R33/56518 ,  G01R33/56563 ,  G01R33/56581

Abstract: A calibration procedure is performed prior to an off-axis MR scan to measure the MRI system timing errors in applying a frequency modulation waveform to the system receiver. Phase errors which otherwise occur when performing non-Cartesian scans are either prospectively reduced by offsetting the timing error or retrospectively offset by applying phase corrections to the acquired image data.

Abstract translation: 在离轴MR扫描之前执行校准程序，以测量向系统接收机施加频率调制波形时的MRI系统定时误差。 通过对所获取的图像数据应用相位校正，通过偏移定时误差或回溯偏移来预先执行非笛卡尔扫描时出现的相位误差。

公开(公告)号：US20050033156A1

公开(公告)日：2005-02-10

申请号：US10887413

申请日：2004-07-08

Applicant: Gunnar Kruger ,  Stefan Thesen

Inventor： Gunnar Kruger ,  Stefan Thesen

IPC: G01R33/565 ,  A61B5/05

CPC classification number: G01R33/56563 ,  G01R33/243 ,  G01R33/56581

Abstract: In a method for calculating a one-dimensional map of the base magnetic field B0 and subsequent correction, based on this map, of image artifacts due to B0 field changes, in the examination of a subject with a magnetic resonance tomography apparatus, data for a slice of the subject to be examined are obtained with a sequence of a fast MRT imaging method that includes at least three phase correction scans and measurement signals of the respective phase correction scans as well as of the slice are obtained, the phase difference of the data points (respectively pertaining to one another) of two phase correction scans, in the form of the acquired measurement signals of the respective phase correction scans, are calculated point-by-point, the average phase difference between the phase correction scans is evaluated, and the frequency offset between the actual resonance frequency relative to the adjusted resonance frequency is calculated based on the average phase difference and the echo time difference between the phase correction scans used, a B0 field map is calculated dependent on the frequency offset and, the measurement data for the slice are corrected using the calculated B0 field map.

Abstract translation: 在用于计算基本磁场B0的一维图和随后的校正的方法中，基于该图，由于B0场变化引起的图像伪像，在用磁共振断层摄影装置检查对象的情况下， 通过快速MRT成像方法的序列获得待检查对象的切片，该序列包括至少三个相位校正扫描，并且获得各个相位校正扫描以及切片的测量信号，数据的相位差 逐点计算以相应的相位校正扫描获取的测量信号的形式进行两个相位校正扫描的点（分别彼此相关），评估相位校正扫描之间的平均相位差，并且 基于平均相位差和回波时间计算实际谐振频率相对于调整后的谐振频率之间的频率偏移 使用的相位校正扫描之间的差异，根据频率偏移计算B0场映射，并且使用计算的B0场映射来校正切片的测量数据。

公开(公告)号：US06259940B1

公开(公告)日：2001-07-10

申请号：US09301246

申请日：1999-04-28

Applicant: Matthew A. Bernstein ,  John Huston, III

Inventor： Matthew A. Bernstein ,  John Huston, III

IPC: A61B5055

CPC classification number: G01R33/5635 ,  G01R33/56308 ,  G01R33/56518 ,  G01R33/56581

Abstract: In an MRI system using high-performance gradient hardware, a method includes de-rating selected lobes in a 2DTOF imaging pulse sequence; employing images from the two-dimensional imagery to detect the presence of disease; and performing three-dimensional contrast-enhanced MRA if disease was detected at a sufficiently high level to make three-dimensional imaging useful. By de-rating selected lobes of the 2DTOF imaging pulse sequence, sensitivity to carotid stenosis at or above the clinically important range of 60-70% is achieved.

Abstract translation: 在使用高性能梯度硬件的MRI系统中，一种方法包括以2DTOF成像脉冲序列降低所选择的瓣; 使用二维图像的图像来检测疾病的存在; 并且如果在足够高的水平检测到疾病以使三维成像有用，则执行三维造影增强MRA。 通过降低2DTOF成像脉冲序列的选定的瓣膜，实现了临床上重要范围为60-70％之间的颈动脉狭窄的敏感性。

公开(公告)号：US20150241537A1

公开(公告)日：2015-08-27

申请号：US14191921

申请日：2014-02-27

Applicant: TOSHIBA MEDICAL SYSTEMS CORPORATION ,  KABUSHIKI KAISHA TOSHIBA

Inventor： Wayne R. DANNELS

IPC: G01R33/561 ,  G01R33/48 ,  G01R33/565

CPC classification number: G01R33/56554 ,  G01R33/5611 ,  G01R33/56341 ,  G01R33/56581

Abstract: A magnetic resonance imaging (MRI) system, method and/or computer readable medium is configured to effect MR imaging with reduced artifact by generating one or more image reconstruction maps from one or more prescans, acquiring a main scan dataset from a main MRI scan of an object, warping one or more image reconstruction maps to have geometric distortions substantially corresponding to geometric distortions in the main scan dataset, and forming a diagnostic MR image of the object using the main scan dataset and the warped one or more image reconstruction maps.

Abstract translation: 磁共振成像（MRI）系统，方法和/或计算机可读介质被配置为通过从一个或多个预扫描器生成一个或多个图像重建图来实现具有减少伪像的MR成像，从主扫描数据集获取主扫描数据集 一个对象，使一个或多个图像重建图变形以具有基本对应于主扫描数据集中的几何失真的几何失真，以及使用主扫描数据集和扭曲的一个或多个图像重建图形成对象的诊断MR图像。

公开(公告)号：US09050018B2

公开(公告)日：2015-06-09

申请号：US13143937

申请日：2010-01-13

Applicant: Uri Rapoport

Inventor： Uri Rapoport

IPC: G01V3/00 ,  A61B5/055 ,  G01R33/38 ,  G01R33/381 ,  G01R33/561 ,  G01R33/565 ,  G01R33/567

CPC classification number: A61B5/055 ,  G01R33/38 ,  G01R33/3806 ,  G01R33/381 ,  G01R33/5617 ,  G01R33/56554 ,  G01R33/56563 ,  G01R33/56581 ,  G01R33/5676

Abstract: Means and methods for improving the MRI “image quality in an MRI imaging” apparatus comprising a non-superconducting electromagnet and a plurality of pole pieces are provided. Said means for improving the image quality chosen from the group consisting of (a) means for reducing degradation of MRI image quality due to B0 field instability; (b) means for decreasing or otherwise correcting residual magnetization; (c) means for providing a 3D scout image; and (d) any combination of the above. These means for improving the image quality provides greater resolution of the imaged object relative to an MRI apparatus not containing such means for improving image quality.

Abstract translation: 提供了用于改善包括非超导电磁体和多个极片的MRI“MRI成像”图像质量的装置和方法。 所述用于提高从由以下组成的组中选择的图像质量的装置：（a）用于降低由于B0场不稳定性引起的MRI图像质量降低的装置; （b）用于减少或以其他方式校正残余磁化的装置; （c）提供3D侦察图像的装置; 和（d）上述的任何组合。 用于改善图像质量的这些方法相对于不包含用于提高图像质量的装置的MRI装置，提供了成像对象的更高分辨率。