Abstract

目的 探讨多发性硬化(MS)患者的MS斑块、斑块旁脑白质和T2WI上表现为正常的脑白质区(NAWM)的扩散张量成像(DTI)特点,并探讨DTI和三维脑白质束示踪技术对MS的应用价值.方法 对32例MS患者和32名与MS患者年龄性别配对的正常人进行头部DTI检查,生成表观扩散系数图(ADC)和部分各向异性图(FA),分别选取MS斑块、斑块旁脑白质区、NAWM区和对照组正常人相应脑白质区测量ADC值和FA值,并使用示踪技术做出三维脑白质束图像.结果 MS斑块、斑块旁脑白质区、NAWM区和对照组的ADC平均值分别为(1.233±0.119)、(0.973±0.098)、(0.748±0.089)×10-3 mm2/s和(0.620±0.094)×10-3 mm2/s,FA平均值分别为0.225±0.052、0.311±0.050、0.421±0.070和0.476±0.069.对MS斑块、斑块旁脑白质、NAWM数据进行随机区组方差分析最小显著差法检验,差异有统计学意义(P<0.01).MS斑块、斑块旁脑白质、NAWM分别和对照组配对t检验,差异有统计学意义(P<0.01).用三维脑白质束图像可以观察到MS斑块.结论 使用DTI检查生成的ADC图和FA图可以有助于评价MS中各部位脑白质的改变.通过三维脑白质束示踪图像可以立体直观地显示MS斑块区白质束的异常。

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