公开(公告)号：US09977108B2

公开(公告)日：2018-05-22

申请号：US14432931

申请日：2013-09-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Kay Nehrke ,  Peter Boernert ,  Johan Michiel Den Harder ,  Thomas Hendrik Rozijn

IPC: G01R33/20 ,  G01R33/561 ,  G01R33/24 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

CPC classification number: G01R33/5611 ,  A61B5/055 ,  G01R33/246 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

Abstract: The invention relates to a method of parallel MR imaging, wherein a reference scan is performed by means of a stimulated echo sequence including i) at least two preparation RF pulses (α) radiated toward a portion of a body (10) during a preparation period (21), and ii) one or more reading RF pulses (β) radiated toward the portion of the body (10) during an acquisition period (22) temporally subsequent to the preparation period (21). One or more FID signals (I1) and one or more stimulated echo signals (I2) are acquired during the acquisition period (22). The spatial receive and/or—if applicable—transmit4 sensitivity profiles of at least two RF coils (11, 12, 13) are derived from the acquired FID signals (I1) and/or from the acquired stimulated echo signals (I2). The parameters of the stimulated echo sequence are selected such that it is robust against susceptibility-induced artifacts. Moreover, 10 the invention relates to a MR device (1) and to a computer program for a MR device (1).

公开(公告)号：US20150253406A1

公开(公告)日：2015-09-10

申请号：US14432931

申请日：2013-09-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Kay Nehrke ,  Peter Boernert ,  Johan Michiel Den Harder ,  Thomas Hendrik Rozijn

IPC: G01R33/561 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

CPC classification number: G01R33/5611 ,  A61B5/055 ,  G01R33/246 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

Abstract: The invention relates to a method of parallel MR imaging, wherein a reference scan is performed by means of a stimulated echo sequence including i) at least two preparation RF pulses (a) radiated toward a portion of a body (10) during a preparation period (21), and ii) one or more reading RF pulses 03) radiated toward the portion of the body (10) during an acquisition period (22) temporally subsequent to the preparation period (21). One or more FID signals (I1) and one or more stimulated echo signals (I2) are acquired during the acquisition period (22). The spatial receive and/or—if applicable—transmit4 sensitivity profiles of at least two RF coils (11, 12, 13) are derived from the acquired FID signals (I1) and/or from the acquired stimulated echo signals (I2). The parameters of the stimulated echo sequence are selected such that it is robust against susceptibility-induced artefacts. Moreover, 10 the invention relates to a MR device (1) and to a computer program for a MR device (1).

Abstract translation: 本发明涉及一种并行MR成像的方法，其中通过受激回波序列执行参考扫描，所述回波序列包括i）在准备期间向身体（10）的一部分辐射的至少两个准备RF脉冲（a） （21），以及ii）在所述准备期间（21）之后的采集周期（22）期间朝向所述身体（10）的所述部分辐射的一个或多个读取RF脉冲03）。 在采集周期（22）期间获取一个或多个FID信号（I1）和一个或多个受激回波信号（I2）。 至少两个RF线圈（11,12,13）的空间接收和/或 - 如果可应用的传输4灵敏度分布是从所获取的FID信号（I1）和/或从获取的受激回波信号（I2）导出的。 选择刺激回波序列的参数，使其对抗敏感性诱导的伪像是鲁棒的。 此外，本发明涉及MR装置（1）和用于MR装置（1）的计算机程序。

公开(公告)号：US10120054B2

公开(公告)日：2018-11-06

申请号：US14917594

申请日：2014-09-05

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Johan Michiel Den Harder ,  Marius Johannes Van Meel

IPC: G01R33/24 ,  G01R33/565 ,  G01R33/561 ,  G01R33/385

Abstract: A method and apparatus for parallel MR imaging include the steps of: —subjecting a portion of a body (10) to a first imaging sequence (21,22) of RF pulses and switched magnetic field gradients, wherein first MR signals (11,12) are acquired via at least two RF coils having different spatial sensitivity profiles within the examination volume, —deriving the spatial sensitivity profiles of the at least two RF coils from the acquired first MR signals, —subjecting the portion of the body to a second imaging sequence of RF pulses and switched magnetic field gradients, wherein second MR signals are acquired by parallel acquisition via the at least two RF coils with sub-sampling of k-space, and—reconstructing a MR image from the acquired second MR signals and from the spatial sensitivity profiles of the at least two RF coils. A type and/or parameters of the first imaging sequence are selected automatically depending on the presence of a metal implant in the body. The selection of the type of the first imaging sequence is made between a gradient echo sequence, if no metal implants are present, and a spin echo sequence or a stimulated echo sequence, if a metal implant is present.