摘要
目的了解正常人腰脊神经节在三维(3D)MRI 上的形态特征。方法对115例15～75岁的健康志愿者共1150个腰脊神经节,进行3D 快速梯度回波选择性水激励成像,原图像进行最大强度投影(NIP)重组成间隔12°系列冠状面图像。分析神经节的位置、信号强度、结构并测量大小。结果 L1～5水平椎管内型神经节分别为225、225、219、210、160个,L3～5水平椎管内型神经节逐渐增多,以15水平最多(X^2=188.371,P<0.01),达29.1%。1113个(96.8%)神经节在 MIP 图像上为等信号。L1神经节横径及长径分别为2.00～5.50 mm[(3.38±0.77)mm]、2.00～7.00 mm[(4.35±0.89)mm];15神经节横径及长径分别为3.50～9.00mm[(6.40±0.91)mm]、6.00～19.00 mm[(11.58±2.25)mm];L1～5水平神经节横径及长径逐渐增大(F=41.527～205.998,P<0.01)。1150个神经节中822个为单节型,317个为双节型,11个为三节型。结论 3D MR 成像能清楚显示神经节形态及其解剖变异。越靠近尾侧水平的脊神经节其位置越靠近近端,其体积也越大。
Objective To investigate the morphological features of normal lumbar dorsal root ganglia using a three-dimensional （3D） coronal MR imaging. Methods One hundred and fifteen volunteers were included. Ages ranged from 15 to 75 years, with a mean of 40 years. Coronal 3D fast field echo （FFE） with water selective excitation （Proset） MR examination of 1150 dorsal root ganglia were underwent at nerve root levels from L1 to L5. The source coronal images were further reconstructed into a series of rotational alignment coronal images with an interval angel of 12 degree using maximum intensity projection （MIP） technique. All DRGs of bilateral spinal nerve from L1 to L5 were morphologically analyzed on the original and MIP images including qualitative evaluation of the location, signal intensity, architecture and quantitative dimensional t. Results There were 225, 225, 219, 210 and 160 foraminal ganglia from L1 to L5 level, respectively. The incidence of intraspinal ganglia from L3 to L5 gradually increased with a maximum at L5 level of 29.1% （χ^2 = 188. 371, P 〈 0. 01 ）. One thousand one hundred and thirteen （96. 8% ） DRGs were intermediate intensity on MIP images. The width and length of L1 DRGs were from 2.00 to 5.50 mm （3.38±0. 77） mm, 2.00 to 7. 00 mm （4. 35±0. 89） mm,respectively. The width and length of L5 DRGs were from 3.50 to 9.00 mm （6.40±0.91） mm, 6.00 to 19.00 mm [（11.58±2. 25） mm] ,respectively. There was statistically significant difference in the dimension of DRGs from L5 to L1 （F = 41. 527-205. 998, P 〈 0. 01 ）. In 1150 DRGs, three types of architecture of DRGs including 822 singular, 317 bi- and 11 tri-ganglion DRGs could be found with a high prevalence of the bi-ganglia in IA and L3 DRGs and a higher incidence of the singular ganglia in the L5 and L2 and L1 DRGs. Conclusions The normal anatomy and variant of the lumbar dorsal root ganglia could be clearly demonstrated by 3D FFE MR imaging with Proset. As the level of the nerve root traveled down caudally, the lumbar DRGs locate more proximally and have relatively larger sizes.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2007年第9期941-946,共6页
Chinese Journal of Radiology
关键词
脊神经根
腰椎
磁共振成像
Spinal nerve roots
Lumbar vertebrae
Magnetic resonance imaging
