Clinical MR at 3 Tesla: Current Status

被引：30
作者：
Baudendistel K.T. [1 ,2 ]
Heverhagen J.T. [1 ]
Knopp M.V. [1 ]
机构：
[1] Department of Radiology, College of Medicine, Ohio State University, Columbus, OH
[2] Division of Imaging Research, Department of Radiology, Ohio State University, Columbus, OH 43210
来源：
Der Radiologe | 2004年 / 44卷 / 1期
关键词：
3; T-MRI; Contrast mechanisms; High-field-MRI; Whole body imaging;
D O I：
10.1007/s00117-003-0995-3
中图分类号：
学科分类号：
摘要：
Clinical MRI is mostly performed at field strengths up to 1.5 Tesla (T). Recently, approved clinical whole-body MR-systems with a field strength of 3 T became available. Its installation base is more rapidly growing than anticipated. While siting requirements and operation of these systems do not differ substantially from systems with lower field strength, there are differences in practical applications. Imaging applications can use the gain in signal-to-noise for increased spatial resolution or gain in speed. This comes at a trade off in increased sensitivity to field inhomogeneities and changes in relaxation times, which lead to changes in image contrast. The benefit of high field for spectroscopy consists in increased signal-to-noise-ratio and improvement in frequency resolution. The increase in energy deposition necessitates the use of special strategies to reduce the specific absorption rate (SAR). This paper summarizes the current state of MR at 3 T.
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页码：11 / 18
页数：7
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