Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings
Intracranial epidermoid cysts: diffusion-weighted, FLAIR and conventional MR findings
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DOI：
10.1016/j.ejrad.2004.06.018
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发表时间：
2005-05-01
影响因子：
3.3
通讯作者：
Ergin, N
中科院分区：
文献类型：
--
作者：
Hakyemez, B;Aksoy, U;Ergin, N
目的：目的：比较弥散加权平面回波成像（DW）、自旋回波（SE）和液体衰减反转恢复（FLAIR）序列对表皮样囊肿（ECs）的诊断价值，并评价T2穿透效应。材料和方法：15例患者在两种不同的1.5T磁共振（MR）设备上前瞻性地进行SE、FLAIR和DW回波平面成像。定性和定量评估由两名放射科医生一致进行。从所有EC获得表观扩散系数（ADC）值。在II情况下获得指数DW图像以消除T2穿透效应。结果：FLAIR序列对内皮细胞的显示上级T1和T2加权序列。在U型病例中，仅用DW成像就可以从周围结构中勾画出病变的边界，其中EC明显高信号。ECs的ADC值显著低于CSF（P < 0.001），显著高于深部白色物质（P < 0.01）。结论：FLAIR序列在显示脑血管内皮细胞方面上级常规MR序列，DW成像在显示脑血管内皮细胞边界方面上级其他MR序列。指数型DW图像显示，迹线图像中的高信号是由病变的T2效应增加而不是ADC值降低引起的。(c)2004爱思唯尔爱尔兰有限公司保留所有权利。
Purpose: To compare diffusion-weighted echo-planar imaging (DW) with spin-echo (SE), and fluid-attenuated inversion recovery (FLAIR) sequences in the evaluation of epidermoid cysts (ECs), and to evaluate T2 shine-through effect.Materials and methods: Fifteen patients were imaged prospectively in two different 1.5 T magnetic resonance (MR) units with standard head coils with SE, FLAIR and DW echo planar imaging sequences. The qualitative and quantitative assessments were performed by two radiologists in consensus. Apparent diffusion coefficient (ADC) values were obtained from all ECs. Exponential DW images are obtained in I I cases to eliminate T2 shine-through effects. The results are analyzed with variance analysis (ANOVA) and Bonferroni t method.Results: FLAIR sequence was superior to T1- and T2-weighted sequences in showing ECs. In U cases, the borders of the lesions could be delineated from the surrounding structures with only DW imaging where ECs were markedly hyperintense. The ADC values of ECs are significantly lower than CSF (P < 0.001), and significantly higher than deep white matter (P < 0.01). On exponential DW images, ECs had similar intensity with brain parenchyma showing that the real cause of the hyperintensity of the lesions on trace images is the enhanced T2 effect of the tissue.Conclusion: FLAIR sequence is superior to the conventional MR sequences in demonstrating the ECs and DW imaging is superior to other MR sequences in delineating the borders of the ECs. Exponential DW images had shown that the hyperintensity in the trace images are caused by increased T2 effect of the lesion rather than the decrease in ADC values. (c) 2004 Elsevier Ireland Ltd. All rights reserved.