IDEAL序列在脊柱脂肪抑制中的应用

目的 比较IDEAL T2WI、FSE T2WI序列在脊柱脂肪抑制扫描中的应用价值.资料与方法 35例脊柱MRI检查患者(颈椎10例、胸椎8例、腰椎17例)同时采用IDEAL T2WI、FSE T2WI两种脂肪抑制序列扫描,对图像脂肪抑制质量进行主观评价分级评估并测量信噪比.结果 FSE T2WI脂肪抑制质量主观评价分级为颈椎( 1.30±0.48)级、胸椎(1.80±0.71)级、腰椎(2.30±0.69)级,而IDEAL T2WI序列颈、胸椎均为(3.00±0.00)级、腰椎为(2.80±0.56)级；FSE T2WI脂肪抑制序列信噪比平均值分别为颈( 8.73±4.66)、胸(11.33±9.27)、腰(6.81±10.15),IDEAL T2WI序列信噪比平均值分别为颈( 18.90±7.71)、胸(26.02±11.61)、腰(19.57±9.12),两序列信噪比差异有统计学意义(t=3.73、5.72、11.23,P＜0.05).结论 脊柱MRI脂肪抑制扫描IDEAL T2WI序列优于FSE T2WI序列,IDEAL T2WI序列能提供更均匀稳定的脂肪抑制效果,脊柱图像信噪比高,可清晰显示脊柱病变.

Application of Spine Fat Suppression Using IDEAL

Purpose To assess the clinical value of iterative decomposition of water and fat with echo asymmetry and least-squares estimation(IDEAL) in spine imaging by comparing the image quality of T2WI with frequency-selective fat saturation.Materials and Methods Thirty-five patients(cervical 10,thoracic 8,lumber 17) underwent spine MR examination using both IDEAL T2-weighted image(T2WI) and frequency-selective fat saturation fast spin echo(FSE) T2WI,and the image quality was compared.Results The image quality of frequency-selective fat saturation on FSE T2WI were 1.30±0.48 in cervical spine,1.80±0.71 in thoracic spine,2.30±0.69 in lumbar spine respectively,and that of IDEAL T2WI were 3.00±0.00 in cervical spine,3.00±0.00 in thoracic spine,2.80±0.56 in lumbar spine respectively.The signal-to-noise ratio(SNR) of frequency-selective fat saturation on FSE T2WI were 8.73±4.66 in cervical spine,11.33±9.27 in thoracic spine,6.81±10.15 in lumbar spine respectively,and that for IDEAL T2WI were 18.90±7.71,26.02±11.61,19.57±9.12 respectively.The SNR of IDEAL T2WI was significantly different from that of frequency-selective fat saturation FSE T2WI(t=3.73、5.72、11.23,P < 0.05)Conclusion The image quality and SNR of IDEAL T2WI are superior to that of frequency-selective fat saturation FSE T2WI.