目的:探讨磁共振弥散张量成像(DTI)在评估由神经血管压迫关系(NVC)所引起的原发性三叉神经痛(PTN)及其功能改变方面的应用价值.方法:收集单侧PTN患者40例(PTN组)及正常志愿者40例(正常对照组),并行MR常规序列及DTI序列扫描,测量三叉神经(TGN)表观扩散系数(ADC)和部分各向异性(FA).结果:(1)PTN组患侧的平均FA值(0.330±0.056)显著低于健侧(0.408±0.054)以及正常对照组双侧(0.423±0.057);PTN组患侧的ADC值[(2.052±0.473)×10-3 mm2/s]则显著高于健侧[(1.541±0.266)×10-3mm2/s]以及正常对照组双侧[(1.431±0.308)×10-3 mm2/s].(2)FA值的降低与ADC的增高呈负相关.结论:DTI技术可以显示血管压迫性三叉神经痛的神经萎缩及脱髓鞘改变,可以进一步指导PTN的诊断和治疗.%Objective Toexplore the application value of diffusion tensor imaging (DTI) in evaluating evaluation offunctional changes of the in patients with primary trigeminal neuralgia caused (PTN) by neurovascular compression. Methods 40 unilateral PTN patients and 40 healthy volunteers were enrolled in ourstudy.They allAll patients underwent the general sequences and DTI ,and then to measured the ADC and FA values of the trigeminal nerves. Results (1) Compared with contralateral side (0.408 ± 0.054)and bilateral sides in control group(0.423 ± 0.057), FA value of the ipsilateral side in PTN group(0.330 ± 0.056) was significant lower (P< 0.05)compared with the contralateral side (0.408 ± 0.054) and bilateral sides in control group (0.423 ± 0.057).The ADC value of ipsilateralside (2.052 ± 0.473)× 10-3 mm2/s was significantly higher (P < 0.05) thancompared withthe contralateral side (1.541 ± 0.266) ×10-3 mm2/s and bilateral sides in control group(1.431 ± 0.308) ×10-3 mm2/s. (2) An There's a nnegative correlation was found (r = -0.613,P < 0.001) between the loss of FA and the increase of ADC (r = -0.613,P < 0.001). Conclusion DTI could be used to evaluate the changes of neuratrophy and demyelination ,so it canmight be used of in diagnosis and treatment of PTNin further way.
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