1H-MR spectroscopy of dog's brain contusion and laceration
- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 8
- DOI:
- 10.3760/j.issn:1005-1201.2006.08.025
- Key Word:
- 颅脑创伤;磁共振成像;磁共振波谱学;动物,实验
Abstract： 目的 探讨家犬脑挫裂伤MR波谱(MRS)表现及其应用价值.方法 家犬10只,200 g砝码1.3 m高以自由坠落方式复制脑挫裂伤动物模型,分6个时间点(1 h、24h、72 h、5 d、8 d和14 d)行常规MR及MRS检查.各时段检查结束后处死家犬,取挫裂伤处脑组织行病理检查.结果 伤后1～24h,N-乙酰天冬胺酸/肌酸(NAA/Cr)、胆碱类化合物(Cho)/Cr及NAA/Cho下降,NAA/Cr分别为0.843±0.214,0.862±0.204,对侧 1.069±0.284,1.048±0.232,t=-7.227,-6.718;Cho/Cr1.181±0.224,1.243±0.134,对侧 1.415±0.305,1.455±0.159,t=-4.332,-4.489;NAA/Cho0.701±0.147,0.536±0.136,对侧 0.832±0.245,0.613±0.165,t=-2.652,-2.665(P值均＜0.05);病理示挫伤处见局部点状出血、灶性坏死、神经轴突肿胀、小胶质细胞轻度增生.伤后72 h至5 d,NAA/Cr开始升高,Cho/Cr于5 d时为1.517±0.197,高于对侧,对侧为1.387±0.214(t=3.758,P＜0.05);镜下示炎性细胞浸润明显,血管周围炎、肉芽及纤维瘢痕形成.伤后8～14 d,NAA/Cr与对侧相比差异无统计学意义(0.895±0.105,0.875±0.153,对侧0.989±0.169,0.990±0.173,t=-2.909,-2.471;P值均＞0.05),Cho/Cr高于对侧(1.457±0.168,1.572±0.374,对侧1.334±0.174,1.366 ±0.352,t=7.312,3.201;P值均＜0.05);病理示炎性反应及胶质增生更加显著,14 d时肉芽肿形成.各时段均未见异常乳酸峰及脂质峰.结论 MRS能无创性检测脑挫裂伤后神经元受损及修复情况,了解其脑组织生化代谢改变,反映损伤的程度,为早期治疗和预后的评价提供理论依据.
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