正常成人下腰椎神经根磁共振选择性激励技术成像的特点

The characteristic of the normal human lower lumbar nerve root under MR principle of selective excitation technique

中文关键词:  腰神经根  磁共振选择性激励技术成像  影像测量

英文关键词:Lumbar nerve roots  MR principle of selective excitation technique  Image measurement

中文摘要:

  【摘要】 目的：利用磁共振选择性激励技术（principle of selective excitation technique，PROSET）成像观察正常成人下腰椎神经根及其毗邻结构的在体影像学特点。方法：2010年12月~2011年3月在我院体检人群中选取50例（男24例，女26例）志愿者，年龄30~75岁，平均52.5岁。均采用3.0T超导型磁共振PROSET行腰椎冠状位扫描，用Mimics 14.0软件系统测量下腰椎神经根的直径（RD），神经根与硬膜囊之夹角（根囊角，RA），神经根与相邻上下位椎弓根之间的距离（神经根上缘与上位椎弓根下缘的距离，PSRD；神经根下缘与下位椎弓根上缘的距离，PIRD），神经根出硬膜囊的位置到椎弓根下缘的距离（PD）。用SPSS 17.0软件统计分析。结果：同一节段RD、RA、PSRD、PIRD及PD的左右侧比较均无统计学差异（P>0.05），故将各指标的左右侧数据合并统计。L3至L5的RD为3.90±0.46mm（1.7～6.4mm）～5.70±0.61mm（3.2～9.0mm），由上至下逐渐增粗； RA为26.70°±3.78°（19.7°～35.1°）～28.50°±3.54°（23.0°～38.5°），由上至下逐渐增大；PSRD为6.50±3.35mm（2.0～10.0mm）～4.60±2.31mm（1.2～9.7mm），PIRD为12.60±3.34mm（8.2～22.4mm）～12.90±3.87mm（5.8～26.1mm），即L5神经根较L3和L4更贴近椎弓根下缘走行，远离椎弓根的上缘；PD为8.40±2.34mm（8.2～27.6mm）～25.90±4.78mm（12.1～54.5mm），从上至下神经根出硬膜囊的位置与椎弓根的距离逐渐变远。结论：磁共振PROSET成像能无创、快速、全面提供下腰椎神经根及其毗邻结构的形态学特点，有助于临床对腰椎疾患的诊疗。

英文摘要:

  【Abstract】 Objective：To investigate the characteristic of the normal lower lumbar nerve root and its relationship with surrounding structures under MR principle of selective excitation technique（PROSET）.Method：From December 2010 to March 2011，MR PROSET sequence coronal images were performed in lumbar nerve roots of 50 healthy volunteers（24 males and 26 females） with age ranging from 30 to 75 years old.The diameter of nerve root（RD），the angle between nerve root and dura mater（RA），the distance from nerve root to the superior edge of pedicle（PSRD） and the inferior edge of pedicle（PIRD），the distance between the outlet of nerve root from dura mater and the inferior edge of the pedicles（PD） were measured in Mimics 14.0 system.Each parameter was calculated using SPSS 17.0.Result：No side-related significant difference was noted at any segment with respect to RD，RA，PSRD，PIRD and PD（P>0.05）.The mean value of RD from L3 to L5 was 3.90±0.46mm（1.7-6.4mm）-5.70±0.61mm（3.2-9.0mm）；the mean RA from L3 to L5 was 26.70°±3.78°（19.7°-35.1°）-28.50°±3.54°（23.0°-38.5°）；the mean PSRD from L3 to L5 was 6.50±3.35mm（2.0-10.0mm）-4.60±2.31mm（1.2-9.7mm）；the mean PIRD from L3 to L5 was 12.60±3.34mm（8.2-22.4mm）-12.90±3.87mm（5.8-26.1mm）；the mean PD from L3 to L5 was 8.40±2.34mm（8.2-27.6mm）-25.90±4.78mm（12.1-54.5mm）.The values of RD，RA，PIRD and PD increased gradually from L3 to L5；on the contrary，the PSRD decreased gradually from L3 to L5.Conclusion：The morphology of the lower lumbar nerve root and its surrounding structures can be non-invasively and accurately detected by PROSET images，which can be used for determination of lumbar disease.