公开(公告)号：US20190219654A1

公开(公告)日：2019-07-18

申请号：US16246598

申请日：2019-01-14

申请人： KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

发明人： Sung-Hong PARK ,  Ki-Hwan KIM

IPC分类号： G01R33/561 ,  G06N20/00 ,  G06N3/08 ,  G01R33/565

CPC分类号： G01R33/5614 ,  G01R33/56545 ,  G01R33/56554 ,  G06N3/08 ,  G06N20/00

摘要： Provided is an MRI image generation method including: acquiring first phase encoding lines obtained by undersampling along a first direction using an MRI device; acquiring second phase encoding lines obtained by undersampling in a second direction different from the first direction using the MRI device; generating a first MRI image based on the first phase encoding lines and the second phase encoding lines; and generating a second MRI image different from the first MRI image based on the first phase encoding lines and the second phase encoding lines.

公开(公告)号：US20180356487A1

公开(公告)日：2018-12-13

申请号：US16007332

申请日：2018-06-13

申请人： Siemens Healthcare GmbH

发明人： Wei Liu ,  Kun Zhou ,  Fang Dong

IPC分类号： G01R33/565 ,  G01R33/54 ,  G01R33/56 ,  G01R33/483

CPC分类号： G01R33/56554 ,  G01R33/4616 ,  G01R33/4833 ,  G01R33/543 ,  G01R33/5602 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/56341 ,  G01R33/56545

摘要： In a magnetic resonance readout-segmented diffusion-weighted imaging method, apparatus, and storage medium, a non-linear phase RF excitation pulse is applied to nuclear spins that exhibit a magnetization intensity vector, and applying, in a slice selection direction, a slice selection gradient pulse of duration corresponding to the non-linear phase RF excitation pulse, so as to flip the magnetization intensity vector into the X-Y plane. Diffusion weighting is performed on the magnetization intensity vector flipped into the X-Y plane. A readout-segmented sampling sequence is executed to read out raw data in a segmented manner from the magnetization intensity vector resulting from diffusion weighting. A view angle tilting gradient pulse is applied in the slice selection direction.

公开(公告)号：US20170196475A1

公开(公告)日：2017-07-13

申请号：US15326263

申请日：2015-07-28

申请人： HITACHI, LTD.

发明人： Nobuyuki YOSHIZAWA

IPC分类号： A61B5/055 ,  A61B5/00 ,  G01R33/563 ,  A61B5/026

CPC分类号： A61B5/055 ,  A61B5/026 ,  A61B5/0263 ,  A61B5/742 ,  G01R33/56366 ,  G01R33/56554

摘要： In order to reduce inaccuracy of a hemodynamic visualization image acquired when a blood flow is labeled before blood flow visualization imaging, an MRI apparatus uses a blood flow velocity to control pulse sequences including a sequence of applying a high-frequency pulse for labeling the blood flow and imaging the subsequent blood flow or display of the hemodynamic visualization image. For example, the blood flow velocity is used for controlling application positions of one or more high-frequency pulses from among a plurality of the high-frequency pulses for labeling. The MRI apparatus controls time between labeling the blood flow and starting imaging and/or the application positions of high-frequency pulses for labeling the blood flow. A threshold value for color display of a blood flow visualization image is controlled.

公开(公告)号：US20170108571A1

公开(公告)日：2017-04-20

申请号：US15128131

申请日：2015-03-20

申请人： KONINKLIJKE PHILIPS N.V.

发明人： MICHEL PAUL JURRIAAN JURRISSEN ,  JOHANNES PETRUS GROEN ,  MIHA FUDERER

IPC分类号： G01R33/565 ,  G01R33/48 ,  G01R33/58 ,  G01R33/561

CPC分类号： G01R33/56554 ,  A61B2217/00 ,  A61K6/00 ,  G01R1/00 ,  G01R33/4818 ,  G01R33/5611 ,  G01R33/5616 ,  G01R33/56545 ,  G01R33/583

摘要： In an EPI acquisition sequence for magnetic resonance signals k-space is scanned along sets of lines in k-space along opposite propagation directions, e.g. odd and even lines in k-space. Phase errors that occur due to the opposite propagation directions are corrected for in a SENSE-type parallel imaging reconstruction. The phase error distribution in image space may be initially estimated, calculated form the phase difference between images reconstructed from magnetic resonance signals acquired from the respective sets of k-space lines, or from an earlier dynamic.

公开(公告)号：US09612307B2

公开(公告)日：2017-04-04

申请号：US14113044

申请日：2012-04-23

申请人： Xiaohong Joe Zhou

发明人： Xiaohong Joe Zhou

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

CPC分类号： G01R33/565 ,  G01R33/4824 ,  G01R33/5616 ,  G01R33/56518 ,  G01R33/56554 ,  G01R33/56572

摘要： In PROPELLER utilizing EPI k-space sampling, phase errors arising primarily from eddy currents can considerably degrade image quality. The phase errors include spatially constant phase errors, spatially linear phase errors, and oblique phase errors. Methods to measure and correct for these phase errors are disclosed. Two or three reference scans are acquired, each reference scan being mutually orthogonal along the orthogonal physical gradient axes in a MRI system. A spatially constant phase error and a spatially linear phase error are determined from each of the reference scans for each relevant physical gradient axis. These phase errors can be used to predict the constant, linear, and oblique phase errors in each blade of an EPI PROPELLER k-space data set. With the known phase errors for each blade, constant, linear, and/or oblique phase correction is applied prior to or during PROPELLER image reconstruction, producing an image with substantially reduced artifacts.

公开(公告)号：US09448297B2

公开(公告)日：2016-09-20

申请号：US14240520

申请日：2012-08-27

申请人： George Randall Duensing

发明人： George Randall Duensing

IPC分类号： A61B5/05 ,  G01R33/565 ,  G01R33/36 ,  H01Q3/26

CPC分类号： G01R33/56554 ,  G01R33/36 ,  G01R33/365 ,  H01Q3/26

摘要： A magnetic resonance (MR) system (10) minimizes noise for modes of an array of coils (261, 262, . . . , 26n). The system (10) includes an array of coils (261, 262, . . . , 26n) in which the coils of the array (261, 262, . . . 26n) share impedances. A splitter/combiner (30) receives a plurality of signals (S1; S2, . . . , Sn) from each of the coils (261, 262, . . . , 26n) and converts the plurality of signals (S1; S2, . . . , Sn) to a plurality of signals (S1; S2, . . . , Sn) which are compensated for the shared impedance. The splitter/combiner (30) splits the received signals (S1; S2, . . . , Sn) into components and combines components of like frequency and/or phase to create the impedance compensated signals (S1; S2, . . . , Sn). Each impedance compensated signal is amplified by a corresponding preamplifier (381, 382, . . . , 38n).

摘要翻译： 磁共振（MR）系统（10）使线圈阵列（261,262 ...，26n）的模式的噪声最小化。 系统（10）包括阵列阵列（261,262 ...，26n），其中阵列（261,262 ... ... 26n）的线圈共享阻抗。 分路器/组合器（30）从每个线圈（261,262 ...，26n）接收多个信号（S1; S2，...，Sn）并将多个信号（S1; S2， ...，Sn）到补偿了共享阻抗的多个信号（S1; S2，...，Sn）。 分路器/组合器（30）将接收的信号（S1; S2，...，Sn）分成分量并组合类似频率和/或相位的分量以产生阻抗补偿信号（S1; S2，...，Sn ）。 每个阻抗补偿信号被相应的前置放大器（381,382，...，38n）放大。

公开(公告)号：US20150285891A1

公开(公告)日：2015-10-08

申请号：US14747401

申请日：2015-06-23

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

发明人： Wayne R. DANNELS

IPC分类号： G01R33/565 ,  G01R33/48 ,  G01R33/385 ,  G01R33/561

CPC分类号： G01R33/56554 ,  G01R33/482 ,  G01R33/5611 ,  G01R33/5616

摘要： A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and image generating circuitry. The sequence controlling circuitry executes a pulse sequence which applies a excitation pulse and then continuously applies a readout gradient magnetic field with alternating polarity thereof and acquires echo signals continuously generated by the pulse sequence from a plurality of receive channels. The image generating circuitry corrects the echo signals so as to generate an image, correcting the echo signals for all of the receive channels collectively on the basis of phase differences between echo signals corresponding to even lines of k-space and echo signals corresponding to odd lines of k-space, and corrects the echo signals for each of the receive channels individually on the basis of magnitude differences between echo signals corresponding to the even lines of k-space and echo signals corresponding to the odd lines of k-space.

摘要翻译： 根据实施例的磁共振成像装置包括顺序控制电路和图像产生电路。 序列控制电路执行施加激励脉冲的脉冲序列，然后连续施加具有交替极性的读出梯度磁场，并从多个接收通道获取由脉冲序列连续产生的回波信号。 图像产生电路校正回波信号以产生图像，基于对应于偶数行k空间的回波信号和对应于奇数行的回波信号之间的相位差共同地校正所有接收信道的回波信号 并且基于对应于k空间的偶数行的回波信号和对应于k空间的奇数行的回波信号之间的幅度差来单独校正每个接收信道的回波信号。

公开(公告)号：US09046590B2

公开(公告)日：2015-06-02

申请号：US13434935

申请日：2012-03-30

申请人： Masaaki Umeda

发明人： Masaaki Umeda

IPC分类号： G01R33/565 ,  G01R33/561

CPC分类号： G01R33/56518 ,  G01R33/5617 ,  G01R33/56554

摘要： In a magnetic resonance imaging apparatus according to one embodiment, an executing unit executes a first pre-scan and a second pre-scan, each being a pre-scan in which readout gradient magnetic fields and slice direction gradient magnetic fields are applied in an identical manner to a pulse sequence for main-scanning and in which phase encode gradient magnetic fields are applied in an identical manner to the pulse sequence for main-scanning up to just before echoes used in calculating a correction amount, and each having different predetermined imaging parameters; a calculating unit calculates, as a correction amount, an amount of phase shifting by referring to phase differences present in a plurality of echo signals that are collected during the first pre-scan and the second pre-scan; and a correcting unit corrects the pulse sequence for main-scanning based on the correction amount calculated by the calculating unit.

摘要翻译： 在根据一个实施例的磁共振成像装置中，执行单元执行第一预扫描和第二预扫描，每个是预扫描，其中读出梯度磁场和切片方向梯度磁场以相同的 方式到用于主扫描的脉冲序列，并且其中以与用于主扫描的脉冲序列相同的方式施加相位编码梯度磁场，直到用于计算校正量的回波之前，并且每个具有不同的预定成像参数 ; 计算单元通过参考在第一预扫描和第二预扫描期间收集的多个回波信号中存在的相位差来计算相移量作为校正量，作为校正量; 并且校正单元基于由计算单元计算的校正量校正用于主扫描的脉冲序列。

公开(公告)号：US20150061668A1

公开(公告)日：2015-03-05

申请号：US14017894

申请日：2013-09-04

申请人： TOSHIBA MEDICAL SYSTEMS CORPORATION ,  KABUSHIKI KAISHA TOSHIBA

发明人： WAYNE R. DANNELS

IPC分类号： G01R33/56

CPC分类号： G01R33/56554

摘要： A magnetic resonance imaging (MRI) system, method and/or computer readable medium is configured to effect MR imaging with reduced ghosting artifacts by operations including determining spatially varying signal magnitude differences associated with first and second parts of a reference MR data, and reconstructing a diagnostic image based upon a first and a second parts of main scan data and the determined spatially varying signal magnitude differences. The first parts of the reference data and main scan data is acquired using a first readout gradient, and the second parts of the reference data and main scan data is acquired using a second readout gradient that is different from the first readout gradient.

摘要翻译： 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包括确定与参考MR数据的第一和第二部分相关联的空间上变化的信号幅度差异的操作来减少重影伪像来实现MR成像，并且重构 基于主扫描数据的第一和第二部分以及所确定的空间变化信号幅度差的诊断图像。 使用第一读出梯度获取参考数据和主扫描数据的第一部分，并且使用与第一读出梯度不同的第二读出梯度来获取参考数据和主扫描数据的第二部分。

公开(公告)号：US20150048826A1

公开(公告)日：2015-02-19

申请号：US14530944

申请日：2014-11-03

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

发明人： Masashi HORI, I ,  Motohiro MIURA ,  Hiroshi KUSAHARA ,  Yutaka MACHII ,  Yoshimori KASSAI

IPC分类号： G01R33/54 ,  G01R33/48

CPC分类号： G01R33/54 ,  G01R33/3852 ,  G01R33/4818 ,  G01R33/56545 ,  G01R33/56554 ,  G01R33/56572

摘要： A control device of a magnetic resonance (MRI) imaging apparatus includes a condition setting unit and a judging unit. The condition setting unit sets an imaging sequence to be performed by the magnetic resonance imaging apparatus based on set conditions of the set imaging sequence. The judging unit then (a) calculates a value of electric current supplied to a gradient magnetic field coil of the MRI apparatus to perform that set imaging sequence based on the set conditions of the set imaging sequence, (b) calculates a value of voltage that would need to be applied to the gradient magnetic field coil based on a mutual inductance of the gradient magnetic field to cause electric current flowing to the gradient magnetic field coil to become equal to the value of the calculated electric current, and (c) judges whether the set imaging sequence is practicable or not based on the calculated value of voltage.

摘要翻译： 磁共振（MRI）成像设备的控制装置包括条件设置单元和判断单元。 条件设定部基于设定的成像序列的设定条件来设定由磁共振成像装置进行的拍摄顺序。 判断单元然后（a）计算提供给MRI设备的梯度磁场线圈的电流值，以根据所设置的成像序列的设定条件执行该设定的成像序列，（b）计算电压值 将需要根据梯度磁场的互感力将梯度磁场线圈施加到梯度磁场线圈上，使流过梯度磁场线圈的电流变得等于计算出的电流值，（c）判断是否 基于计算的电压值，设定的成像序列是可行的或不可行的。