Murakami Mizuho, Mori Harushi, Kunimatsu Akira, Abe Osamu, Chikuda Hirotaka, Ono Takashi, Kabasawa Hiroyuki, Uchiumi Kazuyuki, Sato Jiro, Amemiya Shiori, Komatsu Shuhei, Ohtomo Kuni
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
J Comput Assist Tomogr. 2011 Jan-Feb;35(1):16-20. doi: 10.1097/RCT.0b013e3181f8d30d.
Magnetic resonance imaging (MRI) is the most popular follow-up study for patients who have undergone spinal surgery. However, the image quality often becomes poor because of artifacts from metal implants and/or from failed fat suppression, which obscure diagnosis. Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) is a new fat suppression method that is less affected by inhomogeneity of the magnetic field. Here, we compared postsurgical spinal MRI with IDEAL versus chemical shift selective saturation (CHESS).
For 35 patients who had spinal surgery, we examined T2-weighted fast spin-echo sagittal images of the spine with both IDEAL and CHESS. Two radiologists evaluated the degrees of fat suppression and spinal canal projection from 0 (least/worst) to 2 (most/best).
Fat suppression and spinal canal scores for IDEAL were statistically higher than those for CHESS (P < 0.05).
Iterative decomposition of water and fat with echo asymmetry and least-squares estimation is clinically useful for postoperative spinal MRI.
磁共振成像（MRI）是接受脊柱手术患者最常用的随访检查方法。然而，由于金属植入物和/或脂肪抑制失败产生的伪影，图像质量常常变差，从而影响诊断。迭代分解水和脂肪的回波不对称最小二乘估计法（IDEAL）是一种新的脂肪抑制方法，受磁场不均匀性的影响较小。在此，我们比较了采用IDEAL和化学位移选择性饱和法（CHESS）进行脊柱手术后MRI检查的效果。
对35例接受脊柱手术的患者，我们采用IDEAL和CHESS两种方法检查了脊柱的T2加权快速自旋回波矢状位图像。两名放射科医生对脂肪抑制程度和椎管投影情况进行评估，评分从0（最差）到2（最佳）。
IDEAL的脂肪抑制和椎管评分在统计学上高于CHESS（P < 0.05）。
迭代分解水和脂肪的回波不对称最小二乘估计法在脊柱术后MRI检查中具有临床应用价值。
