摘要
目的:评价正常成人视神经—眼平面(NOP)视交叉以外段颅神经的MRI表现并与尸解测量结果对照,建立正常标准。方法:随机选择正常成人志愿者100例,采用GE1.5TMRIecho speed plus超导型磁共振成像仪及相控阵头线圈,成像序列包括自旋回波T1加权成像(SE-T1WI),自旋回波T2加权成像(SE-T2WI)和脂肪抑制序列(fs-TSE-T2WI);扫描方位以NOP平面为基准扫描。对20例无眼部疾患的成年尸体以NOP平面为中心进行轴位断层解锯。分别测量两组视神经眼球后神经膨大段直径、眶内段视神经直径、长度,管内段视神经直径及该段视神经起始至同侧视交叉的长度,后者与眶内段视神经长度之和即代表颅外段视神经的长度。结果:NOP平面上,正常人眼球后神经膨大段直径为4.2±0.56mm,眶内段直径为3.1±0.45mm、长度为24.6±2.88mm,管内段视神经直径为3.2±0.49mm,至同侧视交叉的长度为18.7±2.40mm,颅外段视神经的长度为43.3±3.83mm;尸解上述部位指标依次为3.9±0.30mm、3.8±0.40mm、23.9±3.00mm、3.4±0.39mm、17.4±1.37mm、41.2±3.00mm。统计分析,正常成人组内性别和年龄、双侧视神经之间无显著差异,正常人组和尸解组眶内段视神经、管内段视神经直径存在差异(P=0.000和P=0.021,均小于0.05)。正常成人组与尸解组的其余四项测量结果差异无显著性(P>0.05)。结论:NOP平面评价视神经有很大优势,MRI可以很好显示视神经的形态,是研究其解剖和疾病的有效检查手段;但是MRI的部分视神经数据与尸解数据还存在差异。
Objective：To evaluate the MRI features of optic nerve in nounal adults and establish the normal standards of the optic nerve which from the origination to the optic chiasm, and compared with anatomical study. Methods： 100 healthy adult volunteers were studied with GE 1.5T MRI echo speed plus system and phase array head coil. The sequences included T1WI, T2WI and fs-TSE-T2WI. Based on the neuro-optic plan （NOP）, the first group was scanned on MRI and the second group （20 bodies） was dissected. Parts of the optic such as the thick part behind eyeball, intraorbital part and intra-canal part. All these diameters and lengths were measured on the MRI images and the bodies. Results：To the part nerve behind eyeball, intraobital part and intra-canal part, the diameters （mm） were 4.2±0.56, 3.1±0.45, 3.2±0.49, the length of intraorbital part and intra-canal part were 24.6±2.88 and 18.7±2.40, the total lengths was 43.3 ± 3.83; the anatomical diameters were： 3.9 ± 0.30, 3.8 ± 0.40, 3.4 ± 0.39, the lengths were： 23.9 ±3.00, 17.4 ± 1.37, 41.2± 3.00. Statistics found there were not obvious difference between sex and age of normal adults, the diameters of intraobital part and intra-canal part had difference between adults and bodies （ P = 0.000 and P = 0.021 ,all 〈 0.05）, But the other 4 measurement results had no difference between the two groups （ P 〉 0.05）. Conclusion： NOP has the great useful to evaluate the optic nerve, MRI can show the normal optic nerve, which is a good imaging diagnostic method for the optic nerve and its lesions, but all the data which get from MRI are not well correlated with the anatomical studies.
出处
《医学影像学杂志》
2008年第8期821-824,共4页
Journal of Medical Imaging
关键词
视神经
磁共振成像
解剖
测量
Optic nerve
Magnetic resonance image
Anatomy
Measurement
