法医学杂志 ›› 2012, Vol. 28 ›› Issue (4): 256-260,268.DOI: 10.3969/j.issn.1004-5619.2012.04.004

• 论著 • 上一篇    下一篇

应用磁共振弥散张量成像诊断大鼠锥体束损伤

李上勋1,山  黛2,段祎杰1,邢景军1,丁  杨1,周亦武1   

  1. 1. 华中科技大学同济医学院法医学系,湖北 武汉 430030; 2. 中国科学院武汉物理与数学研究所 波谱与原子分子物理国家重点实验室 武汉磁共振中心,湖北 武汉 430071
  • 发布日期:2012-08-25 出版日期:2012-08-28
  • 通讯作者: 周亦武,男,教授,博士研究生导师,主要从事法医病理学、神经病理学研究;E-mail:yiwuhedi@sina.com
  • 作者简介:李上勋(1985—),男,博士研究生,主要从事法医病理学研究;E-mail:lishangxun@gmail.com
  • 基金资助:

    教育部留学回国人员科研启动基金资助项目(2009-35);中国科学院波谱与原子分子物理国家重点实验室开放基金资助项目(T152909);上海市法医学重点实验室开放课题(KF1107)

Magnetic Resonance Diffusion Tensor Imaging for Diagnosis of Pyramidal Tract Damage in Rats

LI SHANG-XUN1, SHAN DAI2, DUAN YI-JIE1, XING JING-JUN1, DING YANG1, ZHOU YI-WU1   

  1. 1. Department of Forensic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; 2. Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
  • Online:2012-08-25 Published:2012-08-28

摘要: 目的 探索磁共振弥散张量成像(diffusion tensor imaging,DTI)在大鼠锥体束损伤中的应用价值。 方法 建立大鼠Marmarou模型,伤后3、12、24及72 h行磁共振DTI扫描,探索大鼠双侧锥体束弥散参数、β-淀粉样前体蛋白(β-amyloid precursor protein,β-APP)单位面积阳性轴索数和阳性染色轴索面积百分比、神经丝(neurofilament,NF) 68平均光密度和积分光密度改变规律。 结果 实验组锥体束轴向弥散(axial diffusivity,AD)、各向异性分数(fraction anisotropy,FA)和相对各向异性(relative anisotropy,RA)呈持续性下降,伤后72 h达到最低值(P<0.05),此与β-APP及NF68免疫组织化学染色观察指标变化趋势相对应。相关分析证实AD、FA和RA与β-APP染色指标均呈显著负相关。 结论 DTI对锥体束损伤的早期诊断具有重要的应用价值。

关键词: 法医病理学, 颅脑损伤, 锥体束, 磁共振成像, 弥散, 大鼠

Abstract: Objective To explore the applicability of magnetic resonance diffusion tensor imaging(DTI) for diagnosis of pyramidal tract damage in rats. Methods Marmarou’s model was set up, followed by DTI scanning at 3, 12, 24 and 72 h post trauma to acquire the dispersion parameter of bilateral pyramidal tracts. Moreover, axonal varicosities per square millimeter and the percentage of positive area of axons demonstrated by β-amyloid precursor protein(β-APP) immunostaining were obtained, as well as the mean density and sum density of neurofilament(NF) 68 immunostaining. Results Axial diffusivity(AD), fraction anisotropy(FA) and relative anisotropy(RA) in the pyramidal tract were significantly and continuously reduced and reached to the bottom at 72 h post trauma(P<0.05) in accord with the gradient of axonal damage verified by β-APP and NF68 immunostaining. Furthermore, the changes of AD, FA and RA showed a significant negative correlation with the β-APP immunohistochemical results. Conclusion DTI has important value for early diagnosis in pyramidal tract damage.

Key words: forensic pathology, craniocerebral trauma, pyramidal tracts, diffusion magnetic resonance imaging, rats

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