腰椎软骨终板的MR三维超短回波时间T2*mapping定量评价

摘要

Objective:To explore the feasibility of quantitative evaluation of lumbar intervertebral cartilage endplate using 3 dimensional multi-echo ultrashort echo time pulse sequence MR imaging. Materials and Methods:The images of lumbar cartilage endplate (CEP) were obtained from twenty one young volunteers by using multi-echo ultrashort echo time pulse sequence, and the image quality were evaluated from grade I to grade III in the order from poor to excellent. The T2*values of both upper and lower CEPs were measured at the lumbar artiifcial color maps from L1/L2 to L5/S1. Results:The 210 CEP images were graded as grade III. The average T2*value of upper and lower CEP was (19.76±8.41) ms, and (30.17±17.25) ms, respectively. The difference of CEP T2*value between upper and lower was statistically signiifcant (t=-5.56, P<0.01). Conclusion:Three dimensional multi-echo ultrashort echo time pulse sequence MR imaging provides an effective approach for the quantitative study of lumbar CEP.%目的：应用磁共振三维超短回波时间(ultrashort echo time, UTE)多回波脉冲序列T2*mapping定量评价腰椎软骨终板。材料与方法对21名青年志愿者进行MR UTE多回波脉冲序列扫描，将图像质量按由劣至优顺序分为Ⅰ、Ⅱ、Ⅲ级。在T2*mapping伪彩图上测量L1～L5椎体10个上、下软骨终板的T2*值。结果21例腰椎210个软骨终板图像质量均为Ⅲ级。腰椎上、下软骨终板T2*值平均值分别为(19.76±8.41) ms和(30.17±17.25) ms，两者差异有统计学意义(t=-5.56， P<0.01)。结论磁共振三维超短TE多回波脉冲序列可用于腰椎软骨终板的定量研究。