公开(公告)号：US10156625B2

公开(公告)日：2018-12-18

申请号：US14455165

申请日：2014-08-08

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Kay Nehrke ,  Peter Boernert

IPC分类号： G01R33/565 ,  G01R33/24 ,  G01R33/561 ,  A61B5/055 ,  A61B5/026

摘要： A method of MR imaging, wherein a portion of a body placed in the examination volume of a MR device is subjected to an imaging sequence of RF pulses and switched magnetic field gradients. The imaging sequence is a stimulated echo sequence including i) at least two preparation RF pulses (α) radiated toward the portion of the body during a preparation period, and ii) one or more reading RF pulses (β) radiated toward the portion of the body during an acquisition period temporally subsequent to the preparation period. One or more FID signals and one or more stimulated echo signals are acquired during the acquisition period. A B1 map indicating the spatial distribution of the RF field of the RF pulses within the portion of the body is derived from the acquired FID and stimulated echo signals.

公开(公告)号：US10107884B2

公开(公告)日：2018-10-23

申请号：US14774187

申请日：2014-03-12

申请人： KONINKLIJKE PHILIPS N.V. ,  PHILIPS GMBH

发明人： Peter Boernert ,  Michel Paul Jurriaan Jurrissen ,  Mariya Ivanova Doneva ,  Adrianus Joseph Willibrordus Duijndam ,  Kay Nehrke

IPC分类号： G01V3/00 ,  G01R33/561 ,  G01R33/34 ,  G01R33/56

摘要： A parallel magnetic resonance imaging system (1) includes at least one radio frequency (RF) coil (10, 12) with a plurality of coil elements, a smart select unit (24), a parallel imaging parameter unit (28), and a sequence control (16). The smart select unit (24), from a pre-scan or prior scan of a subject with the at least one RF coil, constructs (60) a signal map and a plurality of noise maps based on different sets of reduction factors. The parallel imaging parameter unit (28) selects a set of reduction factors corresponding to a noise map which includes a highest signal-to-noise ratio (SNR). The sequence control (16) performs a magnetic resonance imaging scan of the subject based on the selected reduction factors.

公开(公告)号：US09977106B2

公开(公告)日：2018-05-22

申请号：US14371887

申请日：2013-01-04

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Kay Nehrke ,  Peter Boernert ,  Ingmar Graesslin ,  Ulrich Katscher ,  Christoph Leussler ,  Holger Eggers

IPC分类号： G01R33/50 ,  G01R33/24 ,  G01R33/54

CPC分类号： G01R33/50 ,  G01R33/243 ,  G01R33/246 ,  G01R33/54

摘要： In an MR imaging method and apparatus, a portion of a body placed in an examination volume of an MR device is subjected to an imaging sequence of RF pulses and switched magnetic field gradients. The imaging sequence is a stimulated echo sequence including i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period (21), and ii) reading RF pulses (β) radiated toward the portion of the body during an acquisition period (22) temporally subsequent to the preparation period (21). FID signals (I1) and stimulated echo signals (I2) are acquired during the acquisition period (22) with equal T2*-weighting. A B1 map indicating a spatial distribution of the RF field of the preparation RF pulses within the portion of the body is derived from the acquired FID (I1) and stimulated echo (I2) signals.

公开(公告)号：US20150042335A1

公开(公告)日：2015-02-12

申请号：US14455165

申请日：2014-08-08

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Kay Nehrke ,  Peter Boernert

IPC分类号： G01R33/565 ,  A61B5/026 ,  A61B5/055 ,  G01R33/24 ,  G01R33/561

CPC分类号： G01R33/5659 ,  A61B5/0263 ,  A61B5/055 ,  G01R33/246 ,  G01R33/5612 ,  G01R33/56509

摘要： The invention relates to a method of MR imaging, wherein a portion of a body (10) placed in the examination volume of a MR device (1) is subjected to an imaging sequence (IMG) of RF pulses and switched magnetic field gradients. The imaging sequence (IMG) is a stimulated echo sequence including i) at least two preparation RF pulses (α) radiated toward the portion of the 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). A B1 map indicating the spatial distribution of the RF field of the RF pulses within the portion of the body (10) is derived from the acquired FID (I1) and stimulated echo (I2) signals. It is an object of the invention to provide an improved B1 mapping method which can be applied in magnetic resonance angiography (MRA) and, in particular, in cardiac imaging, where the acquisition of a complete B1 map needs to be performed within the diastolic phase of the heartbeat. The invention proposes that the portion of the body (10) is subjected to a suppression sequence (BB) for suppression of MR signals emanating from blood prior to the imaging sequence (IMG). Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

摘要翻译： 本发明涉及一种MR成像方法，其中放置在MR装置（1）的检查体积中的身体（10）的一部分经受RF脉冲和切换磁场梯度的成像序列（IMG）。 成像序列（IMG）是受激回波序列，包括i）在制备周期（21）期间朝向身体（10）的部分辐射的至少两个准备RF脉冲（α），以及ii）一个或多个读取RF脉冲 （21）中的临时采集期间（22）朝向身体（10）的部分辐射。 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）。 从所获取的FID（I1）和受激回波（I2）信号中导出表示身体（10）部分内的RF脉冲的RF场的空间分布的B1图。 本发明的目的是提供一种改进的B1映射方法，该方法可应用于磁共振血管造影（MRA），特别是在心脏成像中，其中需要在舒张期内进行完整的B1图的获取 的心跳。 本发明提出，身体（10）的部分经受抑制序列（BB），用于抑制在成像序列（IMG）之前从血液发出的MR信号。 此外，本发明涉及MR设备（1）和用于MR设备（1）的计算机程序。

公开(公告)号：US20150002149A1

公开(公告)日：2015-01-01

申请号：US14371887

申请日：2013-01-04

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Kay Nehrke ,  Peter Boernert ,  Ingmar Graesslin ,  Ulrich Katscher ,  Christoph Leussler ,  Holger Eggers

IPC分类号： G01R33/50 ,  G01R33/54

CPC分类号： G01R33/50 ,  G01R33/243 ,  G01R33/246 ,  G01R33/54

摘要： The invention relates to a method of MR imaging, wherein a portion of a body placed in the examination volume of an MR device is subjected to an imaging sequence of RF pulses and switched magnetic field gradients. The imaging sequence is a stimulated echo sequence including i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period (21), and ii) reading RF pulses (β) radiated toward the portion of the body during an acquisition period (22) temporally subsequent to the preparation period (21). FID signals (I1) and stimulated echo signals I2) are acquired during the acquisition period (22) with equal T2*-weighting. A B1 map indicating the spatial distribution of the RF field of the preparation RF pulses within the portion of the body is derived from the acquired FID (I1) and stimulated echo (I2) signals.

摘要翻译： 本发明涉及一种MR成像方法，其中放置在MR装置的检查体积中的身体的一部分经受RF脉冲和切换磁场梯度的成像序列。 成像序列是受刺激的回波序列，包括i）在制备周期（21）期间向身体部分辐射的两个准备RF脉冲（α），以及ii）读取朝向身体部分辐射的RF脉冲（＆bgr） 在准备期间（21）之后的收购期间（22）。 FID信号（I1）和受激回波信号I2）在采集周期（22）期间采用相等的T2 *加权。 从获取的FID（I1）和受激回波（I2）信号中导出指示身体部分内准备RF脉冲的RF场的空间分布的B1图。