Alvarez-Linera Juan
Neuroradiology Section, Department of Radiology, Hospital Ruber Internacional, La Masó 38, Madrid 28034, Spain.
Eur J Radiol. 2008 Sep;67(3):415-26. doi: 10.1016/j.ejrad.2008.02.045. Epub 2008 May 2.
Since its approval by the FDA in 2000, brain MR imaging at 3.0 T has been increasingly used in clinical practice. Theoretically, the signal-to-noise ratio (SNR) of a 3T MR scanner will be double that of a 1.5 T scanner. However, the relationship between the magnetic field used and the image obtained is very complex. Today, using a 3T magnet in Neuroradiology has far more advantages than disadvantages, and the diagnostic potential of higher strength magnets for structural and vascular scans, diffusion and perfusion imaging, spectroscopy and cortical activation studies is improving. However, it is useful to have an awareness of how increasing field strength affects each of these techniques so that full advantage may be taken of them.
自2000年获得美国食品药品监督管理局（FDA）批准以来，3.0 T脑磁共振成像（MR成像）在临床实践中的应用越来越广泛。理论上，3T MR扫描仪的信噪比（SNR）将是1.5T扫描仪的两倍。然而，所使用的磁场与所获得图像之间的关系非常复杂。如今，在神经放射学中使用3T磁体利远大于弊，更高强度磁体在结构和血管扫描、扩散和灌注成像、波谱分析以及皮质激活研究方面的诊断潜力正在提高。然而，了解场强增加如何影响这些技术中的每一项是很有用的，这样才能充分利用它们。
