膝关节的关节软骨：在3.0 T磁场下采用IDEAL平衡稳态自由进动序列进行快速三维磁共振成像——初步经验
Articular cartilage of the knee: rapid three-dimensional MR imaging at 3.0 T with IDEAL balanced steady-state free precession--initial experience.
作者信息
Gold Garry E, Reeder Scott B, Yu Huanzhou, Kornaat Peter, Shimakawa Ann S, Johnson Jane W, Pelc Norbert J, Beaulieu Christopher F, Brittain Jean H
机构信息
Department of Radiology, Stanford University School of Medicine, 300 Pasteur Dr, SO-68B, Stanford, CA 94305-5105, USA.
出版信息
Radiology. 2006 Aug;240(2):546-51. doi: 10.1148/radiol.2402050288. Epub 2006 Jun 26.
Institutional review board approval and informed consent were obtained for this HIPAA-compliant study. In this study, iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) balanced steady-state free precession (bSSFP), fat-suppressed bSSFP, and fat-suppressed spoiled gradient-echo (GRE) sequences for 3.0-T magnetic resonance (MR) imaging of articular knee cartilage were prospectively compared in five healthy volunteers. Cartilage and fluid signal-to-noise ratio (SNR), cartilage-fluid contrast-to-noise ratio (CNR), SNR efficiency, CNR efficiency, image quality, and fat suppression were compared. Fat-suppressed bSSFP and IDEAL bSSFP had higher SNR efficiency of cartilage (P < .01) than did GRE. IDEAL bSSFP had higher cartilage-fluid CNR efficiency than did fat-suppressed bSSFP or GRE (P < .01). Fat-suppressed bSSFP and IDEAL bSSFP had higher image quality than did GRE (P < .01). GRE and IDEAL bSSFP had significantly better fat-water separation or fat saturation than did fat-suppressed bSSFP (P < .05). IDEAL bSSFP is a promising method for imaging articular knee cartilage.
本符合健康保险流通与责任法案（HIPAA）的研究获得了机构审查委员会的批准并取得了知情同意。在本研究中，对5名健康志愿者的膝关节软骨进行3.0-T磁共振（MR）成像时，前瞻性地比较了采用回波不对称与最小二乘估计水脂迭代分解（IDEAL）的平衡稳态自由进动（bSSFP）序列、脂肪抑制bSSFP序列和脂肪抑制扰相梯度回波（GRE）序列。比较了软骨和液体的信噪比（SNR）、软骨-液体对比噪声比（CNR）、SNR效率、CNR效率、图像质量和脂肪抑制情况。脂肪抑制bSSFP序列和IDEAL bSSFP序列的软骨SNR效率高于GRE序列（P < 0.01）。IDEAL bSSFP序列的软骨-液体CNR效率高于脂肪抑制bSSFP序列或GRE序列（P < 0.01）。脂肪抑制bSSFP序列和IDEAL bSSFP序列比GRE序列具有更高的图像质量（P < 0.01）。GRE序列和IDEAL bSSFP序列在脂肪-水分离或脂肪饱和方面明显优于脂肪抑制bSSFP序列（P < 0.05）。IDEAL bSSFP序列是一种很有前景的膝关节软骨成像方法。
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