公开(公告)号：US20150002149A1

公开(公告)日：2015-01-01

申请号：US14371887

申请日：2013-01-04

Applicant: KONINKLIJKE PHILIPS N.V.

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

IPC: G01R33/50 ,  G01R33/54

CPC classification number: G01R33/50 ,  G01R33/243 ,  G01R33/246 ,  G01R33/54

Abstract: 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.

Abstract translation: 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。