磁场不均匀性对磁共振图像质量的影响及补偿技术综述

Q3 Medicine
Eric Naab Manson, S. Inkoom, A. N. Mumuni
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引用次数: 2

摘要

背景:磁共振成像(MRI)中的磁场不均匀性是由主磁体、磁体周围的外部铁磁组件和患者自身的固有特性引起的。与磁场不均匀性的显著偏差可能在MRI图像中产生伪影,从而损害图像质量。优化磁场均匀性可以提高图像质量,并有助于减少伪影。因此,本文的目的是帮助MRI的放射技师和操作员了解磁场不均匀性的临床基础及其对MR图像的影响。这将有助于他们理解序列参数和图像质量度量之间的权衡,以优化磁场不均匀性。方法:使用MRI、磁场不均匀性、优化、磁场不一致性伪影和MRI匀场等搜索术语,从相关数据库中进行叙述性文献综述。结果:最小化MRI中的场不均匀性并不是一件简单的事,而是涉及到许多因素和步骤。可以基于感兴趣的解剖区域(或组织类型)选择最合适的脉冲序列/成像参数来优化磁场均匀性,以提高MR图像质量,该参数可以最佳地最小化失真并提高SNR,同时通过匀场和使用介电垫来补充。结论:未来基于个体组织密度研究MRI脉冲序列参数与MR图像质量指标测量之间的相关性的工作,可以为减少由于磁化率和化学位移效应引起的磁场不均匀性提供一个新的窗口。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of Magnetic Field Inhomogeneity on the Quality of Magnetic Resonance Images and Compensation Techniques: A Review
Background: Magnetic field inhomogeneity in magnetic resonance imaging (MRI) is caused by the inherent properties of the main magnet, external ferromagnetic components surrounding the magnet, and the patient itself. Significant deviations from magnetic field inhomogeneity can create artifacts in MRI images, thereby compromising image quality. Optimizing magnetic field homogeneity improves image quality and helps to reduce artifacts. The goal of this article therefore is to help radiographers and operators of MRI understand the clinical basis of magnetic field inhomogeneity and its effects on MR images. This would assist them to appreciate the trade-offs between sequence parameters and image quality metrics towards optimizing magnetic field inhomogeneity. Methods: A narrative literature review was conducted from relevant databases using search terms such as MRI, magnetic field inhomogeneity, optimization, magnetic field inhomogeneity artifacts, and MRI shimming. Results: Minimizing field inhomogeneities in MRI is not straightforward but involves a multitude of factors and steps. Magnetic field homogeneity could be optimized to improve MR image quality by choosing the most appropriate pulse sequence/imaging parameters that could best minimize distortion and increase SNR based on the anatomical region of interest (or tissue types) while complementing it with shimming and use of dielectric pads. Conclusion: Future works to investigate the association between the MRI pulse sequence parameters and measurements of MR image quality metrics, based on individual tissue densities, could provide a new window for reducing magnetic field inhomogeneity due to susceptibility and chemical shift effects.
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来源期刊
Reports in Medical Imaging
Reports in Medical Imaging Medicine-Radiology, Nuclear Medicine and Imaging
CiteScore
1.90
自引率
0.00%
发文量
5
审稿时长
16 weeks
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