弥散张量成像对帕金森病前驱期的诊断价值

The diagnostic value of diffusion tensor imaging for the prodromal phase of Parkinson′s disease

目的在logistic回归模型下探讨不同灰质核团弥散张量成像(diffusion-tensor imaging,DTI)对帕金森病前驱期(prodromal Parkinson′s disease,pPD)的诊断与病情评估的价值。方法收集20例pPD患者作为病例组(pPD组),同时选取28例健康人群作为对照组(HC组),所有病例均行MRI平扫及DTI检查,运用DSIstudio软件对所有被检者的DTI图像进行后处理,自动提取pPD与HC组患者基底节、中脑、脑干多个相关灰质核团各参数(FA、MD、AD、RD)值,进行统计学对比分析,采用logistic回归分析,绘制受试者工作特征(ROC)曲线分析比较各参数单独诊断及联合诊断对两组患者的诊断效能;并且对各组参数与简易智力状态检查量表(mini-mental state examination,MMSE)评分进行相关性分析。结果pPD组与HC组基底节、中脑、脑干多个相关灰质核团、多个参数差异有统计学意义(P<0.05),在logistic回归方程模型下,最佳阈值为0.63时,诊断pPD的AUC为0.964,鉴别诊断两组的敏感度、特异度分别为:85.0%、100%(P<0.001),联合诊断效能最高。pPD组患者蓝斑核多个DTI参数与MMSE评分存在相关性(P<0.05),以蓝斑核FA值(r=-0.646,P=0.002)相关系数最高。结论pPD基底节、中脑、脑干多个相关灰质核团损伤广泛且程度不同,蓝斑核AD值对pPD具有定量诊断价值,蓝斑核FA值可以作为pPD患者认知功能障碍严重程度的特征性敏感指标,运用logistic回归模型下DTI多参数联合诊断可有效提高诊断效能,为pPD的早期诊断,早期干预治疗提供有价值的参考。

Objective To explore the value of diffusion-tensor imaging(DTI)of different gray matter nuclei in the diagnosis and assessment of prodromal Parkinson's disease(pPD)under logistic regression model.Methods A total of 20 patients with pPD were collected as case group and 28 healthy people as control group(HC group).All patients were examined by MRI plain scan and DTI.DSI studio was used to post-process the DTI images of all patients.Parameters(FA,MD,AD,RD)of basal ganglia,midbrain and brainstem of patients with pPD and HC group were automatically extracted and statistically analyzed.Logistic regression analysis was used to draw the Receiver Operating Characteristic(ROC)curve to analyze and compare the diagnostic efficacy of individual diagnosis and combined diagnosis of each parameter.And the correlation between the parameters of each group and MMSE score was analyzed.Results There were statistical differences in basal ganglia,midbrain and brain stem in PPD and HC group(P<0.05).Under Logistic regression equation model,when the optimal threshold was 0.63,the AUC of PPD was 0.964.The sensitivity and specificity of differential diagnosis were 85.0%and 100%respectively(P<0.001).There was correlation between DTI parameters and MMSE score in locus coeruleus in PPD group(P<0.05),and the correlation coefficient of FA value in locus coeruleus(r=-0.646,P=0.002)was the highest.Conclusions The lesions of basal ganglia,midbrain and brainstem correlated gray matter nuclei in pPD were extensive and different in degree.AD value of locus coeruleus was valuable for quantitative diagnosis of pPD,FA value of locus coeruleus could be used as a characteristic sensitive index for recognition of the severity of dysfunction in pPD patients.Multi-parameter combined diagnosis of DTI under Logistic regression model could effectively improve the diagnostic efficiency,and provide valuable reference for early diagnosis and intervention of pPD.