IDEAL序列在脊柱脂肪抑制中的应用

Application of Spine Fat Suppression Using IDEAL

目的比较IDEALT2WI、FSET2WI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IDEALT2WI、FSET2WI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 FSET2WI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IDEALT2WI序列颈、胸椎均为(3.00±0.00)级、腰椎为(2.80±0.56)级;FSET2WI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),IDEALT2WI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IDEALT2WI序列优于FSET2WI序列,IDEALT2WI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。

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.