多层射频电流密度成像的噪声分析

Noise analysis for multi-slice radio frequency current density imaging.

作者信息

Wang Dinghui, DeMonte Tim P, Joy Michael L, Nachman Adrian I

机构信息

Dept. of Electr. & Comput. Eng., Toronto Univ., Ont. M5S 3G9 Canada.

出版信息

Conf Proc IEEE Eng Med Biol Soc. 2006;2006:1907-10. doi: 10.1109/IEMBS.2006.259255.

DOI:10.1109/IEMBS.2006.259255

PMID:17946077

Abstract

Radio frequency current density imaging (RF-CDI) is an imaging technique that measures current density distribution at the Larmor frequency utilizing magnetic resonance imaging (MRI). The multi-slice RF-CDI sequence has extended the ability of RF-CDI to image multiple slices and thus has enhanced its capacity for biomedical applications. In this paper, the influence of MRI random noise on the sensitivity of multi-slice RF-CDI measurement is studied. The formula of current noise is derived, which is verified by both simulation and phantom experiments. A 3-D finite-difference time-domain (FDTD) model is employed to compute the electromagnetic fields in the simulation.

摘要

射频电流密度成像（RF-CDI）是一种利用磁共振成像（MRI）测量拉莫尔频率下电流密度分布的成像技术。多层RF-CDI序列扩展了RF-CDI对多个层面成像的能力，从而增强了其在生物医学应用中的效能。本文研究了MRI随机噪声对多层RF-CDI测量灵敏度的影响。推导了电流噪声公式，并通过仿真和体模实验进行了验证。在仿真中采用三维时域有限差分（FDTD）模型来计算电磁场。