磁共振成像中发射和接收B1场的计算。

Computation of transmitted and received B1 fields in magnetic resonance imaging.

作者信息

Milles Julien, Zhu Yue Min, Chen Nan-Kuei, Panych Lawrence P, Gimenez Gérard, Guttmann Charles R G

机构信息

CREATIS, INSA-Bât. Blaise Pascal, 69621 Villeurbanne Cedex, France.

出版信息

IEEE Trans Biomed Eng. 2006 May;53(5):885-95. doi: 10.1109/TBME.2005.863955.

DOI:10.1109/TBME.2005.863955

PMID:16686411

Abstract

Computation of B1 fields is a key issue for determination and correction of intensity nonuniformity in magnetic resonance images. This paper presents a new method for computing transmitted and received B1 fields. Our method combines a modified MRI acquisition protocol and an estimation technique based on the Levenberg-Marquardt algorithm and spatial filtering. It enables accurate estimation of transmitted and received B1 fields for both homogeneous and heterogeneous objects. The method is validated using numerical simulations and experimental data from phantom and human scans. The experimental results are in agreement with theoretical expectations.

摘要

B1场的计算是磁共振图像强度非均匀性确定和校正的关键问题。本文提出了一种计算发射和接收B1场的新方法。我们的方法结合了改进的MRI采集协议和基于Levenberg-Marquardt算法及空间滤波的估计技术。它能够准确估计均匀和非均匀物体的发射和接收B1场。该方法通过数值模拟以及来自模型和人体扫描的实验数据进行了验证。实验结果与理论预期相符。