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7T肾脏磁共振成像：挑战与前景

7 T renal MRI: challenges and promises.

作者信息

de Boer Anneloes, Hoogduin Johannes M, Blankestijn Peter J, Li Xiufeng, Luijten Peter R, Metzger Gregory J, Raaijmakers Alexander J E, Umutlu Lale, Visser Fredy, Leiner Tim

机构信息

Department of Radiology, University Medical Centre Utrecht, Post box 85500, 3508 GA, Utrecht, The Netherlands.

Department of Nephrology, University Medical Centre Utrecht, Utrecht, The Netherlands.

出版信息

MAGMA. 2016 Jun;29(3):417-33. doi: 10.1007/s10334-016-0538-3. Epub 2016 Mar 23.

DOI:10.1007/s10334-016-0538-3
PMID:27008461
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4891364/
Abstract

The progression to 7 Tesla (7 T) magnetic resonance imaging (MRI) yields promises of substantial increase in signal-to-noise (SNR) ratio. This increase can be traded off to increase image spatial resolution or to decrease acquisition time. However, renal 7 T MRI remains challenging due to inhomogeneity of the radiofrequency field and due to specific absorption rate (SAR) constraints. A number of studies has been published in the field of renal 7 T imaging. While the focus initially was on anatomic imaging and renal MR angiography, later studies have explored renal functional imaging. Although anatomic imaging remains somewhat limited by inhomogeneous excitation and SAR constraints, functional imaging results are promising. The increased SNR at 7 T has been particularly advantageous for blood oxygen level-dependent and arterial spin labelling MRI, as well as sodium MR imaging, thanks to changes in field-strength-dependent magnetic properties. Here, we provide an overview of the currently available literature on renal 7 T MRI. In addition, we provide a brief overview of challenges and opportunities in renal 7 T MR imaging.

摘要

向7特斯拉（7T）磁共振成像（MRI）的发展有望大幅提高信噪比（SNR）。这一提高可用于提高图像空间分辨率或缩短采集时间。然而，由于射频场的不均匀性和比吸收率（SAR）限制，肾脏7T MRI仍然具有挑战性。肾脏7T成像领域已经发表了许多研究。虽然最初的重点是解剖成像和肾脏磁共振血管造影，但后来的研究探索了肾脏功能成像。尽管解剖成像在某种程度上仍受不均匀激发和SAR限制，但功能成像结果很有前景。由于场强相关磁特性的变化，7T时增加的SNR对血氧水平依赖和动脉自旋标记MRI以及钠磁共振成像特别有利。在此，我们概述了目前关于肾脏7T MRI的可用文献。此外，我们简要概述了肾脏7T MR成像中的挑战和机遇。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd26/4891364/80dd476f8fe4/10334_2016_538_Fig8_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd26/4891364/390a23c1b4a3/10334_2016_538_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd26/4891364/a4fbda308dcc/10334_2016_538_Fig13_HTML.jpg
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