Naganawa Shinji, Kawai Hisashi, Fukatsu Hiroshi, Ishigaki Takeo, Komada Tomomi, Maruyama Katsuya, Takizawa Osamu
Department of Radiology, Nagoya University School of Medicine, Japan.
Magn Reson Med Sci. 2004;3(4):177-87. doi: 10.2463/mrms.3.177.
Improvements to the inherently high specific-absorption rate (SAR) of high-speed imaging at 3T are necessary in order to render this method clinically feasible. Various efforts have been undertaken to improve the associated hardware and software. In this review, we focus on whole-brain isotropic 3D imaging with a turbo spin-echo sequence with variable flip-angle echo trains (3D-TSE-VFL) and present its technical and clinical features. This sequence can be used to acquire images of various contrasts including T2-weighted, fat-suppressed T2-weighted, fluid-attenuated inversion recovery (FLAIR), fat-suppressed FLAIR, and STIR (short tau inversion recovery). Various aspects of 3D-TSE-VFL are discussed, including CSF (cerebrospinal fluid) and metal artifacts, STIR contrast, small-part visualization other than brain, and the possibility of serial subtraction. Some images from clinical cases are presented.
为使3T高速成像这种方法在临床上可行，必须改进其固有的高比吸收率（SAR）。人们已经做出了各种努力来改进相关的硬件和软件。在本综述中，我们重点关注采用可变翻转角回波链的涡轮自旋回波序列进行全脑各向同性3D成像（3D-TSE-VFL），并介绍其技术和临床特点。该序列可用于获取各种对比度的图像，包括T2加权、脂肪抑制T2加权、液体衰减反转恢复（FLAIR）、脂肪抑制FLAIR和短tau反转恢复（STIR）。讨论了3D-TSE-VFL的各个方面，包括脑脊液（CSF）和金属伪影、STIR对比度、脑外小部分的可视化以及序列减法的可能性。还展示了一些临床病例的图像。
