摘要
目的探讨MRDTI及白质纤维束成像(Fr)在评价脑室旁白质软化症(PVL)脑性瘫痪患儿认知功能中的应用价值,为揭示PVL患儿认知功能障碍的可能神经基础提供帮助。方法选取46例临床确诊为脑性瘫痪的PVL患儿,同时选择足月无窒息史的健康儿童16名进行对照研究。应用发育商(DQ)评价患儿认知功能,根据DQ值将患儿分为轻(11例)、中(19例)、重度(16例)认知障碍组。对受试儿童进行常规MRI及DTI检查,计算各组患儿主要白质纤维束各向异性分数(FA)值,患儿组与对照组间进行非配对t检验,各认知障碍组及对照组组间比较采用单因素方差分析。结果与对照组相比,患儿组左侧皮质脊髓束(患儿组:0.476±0.064;对照组:0.531±0.064),双侧内囊前肢(患儿组:左侧0.357±0.050,右侧0.370±0.040;对照组:左侧0.405±0.081,右侧0.405±0.036),双侧内囊后肢(患儿组:左侧0.483±0.044,右侧0.485±0.046;对照组:左侧0.546±0.091,右侧0.547±0.083),双侧弓状束(患儿组:左侧0.367±0.069,右侧0.363±0.064;对照组:左侧0.433±0.097,右侧0.421±0.091),双侧丘脑后辐射(患儿组:左侧0.390±0.059,右侧0.382±0.047;对照组:左侧0.459±0.067,右侧0.446±0.064),双侧前扣带束(患儿组:左侧0.362±0.056,右侧0.345±0.056;对照组:左侧0.423±0.057,右侧0.417±0.080),双侧上纵束(患儿组:左侧0.323±0.050,右侧0.341±0.056;对照组:左侧0.426±0.102,右侧0.416±0.092)及胼胝体压部(患儿组:0.535±0.090;对照组:0.606±0.060)的FA值显著减低,差异有统计学意义(t值为2.037—3.745,P值均〈0.05);随认知障碍程度的加重,所有纤维束的FA值逐渐下降,各认知障碍组及对照组进行组间比较发现双侧皮质脊髓束、内囊前肢、内囊后肢、左侧弓状束、双侧丘脑后辐射、前扣带束、上纵束及胼胝体压部的FA值差异有统计学意义(F值为3.021~7.146,P值均〈0.05)。进一步两两比较显示,以上纤维束的FA值在对照组与重度认知障碍组问比较,差异均有统计学意义(P值均〈0.05)。结论PVL患儿认知功能障碍与脑内广泛白质纤维束损伤有关,DTI及FT在评价PVL患儿认知功能方面有较高的应用价值。
Objective To investigate the values of diffusion tensor MR imaging (DTI) and fiber tractography (FT) in the assessment of cognitive functions in children with periventricular leukomalacia ( PVL), to facilitate to understand the mechanism of PVL children's cognitive functions. Methods Forty six children with PVL and 16 age-matched volunters were recruited. Developmental quotient (DQ) of all cases was recorded. According to the DQ scores, patients were divided into 3 groups: mild in 11 patients, moderate in 19, and severe in 16. DTI was performed in all cases and fractional anisotropy (FA) values were be calculated. Non-paired t test was used to compare the FA values of major white matter fibers between patients group and controls group. One-way ANOVA was used to compare the FA values among 4 groups. Results Compared with controls, all 46 patients with PVL showed a significant mean FA reduction in left
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2012年第3期203-208,共6页
Chinese Journal of Radiology
基金
教育部博士点基金资助项目(200801590012)
关键词
脑性瘫痪
磁共振成像
弥散
认知障碍
Cerebral palsy
Diffusion magnetic resonance imaging
Cognition disorders