摘要
目的:应用扩散张量成像(DTI)纤维示踪技术(FT)观察腰椎间盘纤维环的形态和完整性,评价其在椎间盘纤维环病变中的应用价值。方法:分别对正常志愿组(n=10)、椎间盘突出组(n=12)、椎间盘脱出组(n=8)共28例受检者的腰椎间盘行常规MR矢状位T1WI、T2WI及轴位PDWI、T2WI扫描和轴位DTI。图像在工作站后处理成FT图和DCavg图、FA图。观察纤维环的形态和完整性,测量正常纤维环和断裂处的DCavg值和FA值。结果:所有被检者均可获得FA图和DCavg图,并利用Fibertracking软件获得被检椎间盘纤维环的三维图像。正常组纤维环在DCavg图和FA图上呈一连续完整的环形结构,DCavg值和FA值均匀,FT图显示纤维环形态完整。突出组病例中平扫仅见椎间盘向后突出而FT图发现其纤维环断裂不连续者3例(30%)。脱出组病例的FT图发现纤维环断裂不连续者5例(62.5%)。断裂处的DCavg值升高,FA值降低。结论:DTI-FT技术能够无创的显示腰椎间盘纤维环的形态和完整性,发现纤维环是否断裂和断裂的位置,是常规MR检查的有效补充。
Objective：To observe the morphous and integrity of lumbar disc annulus fiber with diffusion tensor imaging fiber tracktography（DTI-FT） and to evaluate the clinical value of the DTI-FT in lumbar disc annulus fibers diseases.Methods：Twenty-eight subjects divided into 3 groups, normal volunteer（n=10）, lumbar disc herniation（n=12）, lumbar disc extrusion（n=8）.All were examined with MR scan.MR sequence contained conventional sagittal T1WI, T2WI and axial PDWI, T2WI and axial DTI.The DTI source images sent to the work station and postprocessed fiber tracking（FT） picture, diffusion coefficient average（DCavg） picture, and FA picture.Results：All subjects obtained FA picture and DCavg picture and used the software of＂fiber tracking＂to track the three dimensional images of lumbar disc annulus fibrosus.The normal disc annulus fibrosus presented a continuous and integrated circulus in FA picture and DCavg picture, the average ADC value and FA value were uniform.FT picture of the annulus fibrosus appeared continuous and complete.Three cases（30%） in disc herniation group could only see disc hernia on conventional MRI but annulus fibrosus disruption was found on DTI-FT picture.Five cases（62.5%） of lumbar disc extrusion group, annulus fibrosus disruption was found in DTI-FT picture.The DCavg value rised and FA value reduced in disrupted place.Conclusion：DTI-FT can noninvasively display morphous and integrity of the lumbar disc anulus fibrosus and can demonstre anulus fiber disruption.As an effective supplement of conventional MRI, DTI-FT can offer a precise guidance for treatment.
出处
《中国临床医学影像杂志》
CAS
北大核心
2010年第2期103-106,共4页
Journal of China Clinic Medical Imaging
关键词
椎间盘
磁共振成像
Intervertebral disk
Magnetic resonance imaging
