Lineshape of Magnetic Resonance and its Effects on Free Induction Decay and Steady-State Free Precession Signal Formation

IF 0.4 4区化学 Q4 CHEMISTRY, PHYSICAL

Concepts in Magnetic Resonance Part A Pub Date : 2020-01-19 DOI:10.1155/2020/5057386

C. Ziener, M. Uhrig, T. Kampf, V. Sturm, F. Kurz, S. Heiland, M. Bendszus, M. Pham, P. Jakob, H. Schlemmer, L. Buschle

引用次数: 4

Abstract

Magnetic resonance imaging based on steady-state free precision (SSFP) sequences is a fast method to acquire , , and - weighted images. In inhomogeneous tissues such as lung tissue or blood vessel networks, however, microscopic field inhomogeneities cause a nonexponential free induction decay and a non-Lorentzian lineshape. In this work, the SSFP signal is analyzed for different prominent tissue models. Neglecting the effect of non-Lorentzian lineshapes can easily result in large errors of the determined relaxation times. Moreover, sequence parameters of SSFP measurements can be optimized for the nonexponential signal decay in many tissue structures.

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磁共振线形及其对自由感应衰减和稳态自由进动信号形成的影响

基于稳态自由精度(SSFP)序列的磁共振成像是一种快速获取图像和加权图像的方法。然而，在不均匀的组织中，如肺组织或血管网络，微观场的不均匀性会导致非指数自由诱导衰减和非洛伦兹线形。在这项工作中，分析了不同突出组织模型的SSFP信号。忽略非洛伦兹线形的影响很容易导致松弛时间的确定误差很大。此外，SSFP测量的序列参数可以针对许多组织结构中的非指数信号衰减进行优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Concepts in Magnetic Resonance Part A 物理-光谱学

CiteScore

0.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Concepts in Magnetic Resonance Part A brings together clinicians, chemists, and physicists involved in the application of magnetic resonance techniques. The journal welcomes contributions predominantly from the fields of magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), and electron paramagnetic resonance (EPR), but also encourages submissions relating to less common magnetic resonance imaging and analytical methods. Contributors come from academic, governmental, and clinical communities, to disseminate the latest important experimental results from medical, non-medical, and analytical magnetic resonance methods, as well as related computational and theoretical advances. Subject areas include (but are by no means limited to): -Fundamental advances in the understanding of magnetic resonance -Experimental results from magnetic resonance imaging (including MRI and its specialized applications) -Experimental results from magnetic resonance spectroscopy (including NMR, EPR, and their specialized applications) -Computational and theoretical support and prediction for experimental results -Focused reviews providing commentary and discussion on recent results and developments in topical areas of investigation -Reviews of magnetic resonance approaches with a tutorial or educational approach