正常颅颈交界区韧带结构的影像研究

目的 探讨颅颈交界区(CCJ)韧带结构的影像特点,优化该区域韧带的检查方法 及序列.方法 各选取51名健康志愿者,分别行CT和MR检查.分析CCJ韧带结构的CT和MRI表现,并由2名高年资影像医师比较T1WI、T2WI、质子密度加权像(PDWI)、T2*WI、短时反转恢复序列(STIR)及质子密度加权脂肪饱和序列(PDFSAT)对CCJ韧带的显示效果.对原始数据进行标准正态秩变换,然后进行重复测量方差分析.结果 CT和MRI均能清晰显示除寰枕前膜(仅在MRI上显示)以外的CCJ韧带结构及其毗邻结构,其中MRI更具优势.寰枕前膜在MRI上显示率为100%(51/51),齿突尖韧带在CT和MRI上显示率分别为29.4%(15/51)、43.1%(22/51),寰枕后膜-硬膜复合体、覆膜-硬膜复合体、横韧带及翼状韧带在CT和MRI上的显示率均为100%(51/51).2名医师对于PDWI的评分结果 M均为5.0分,差异无统计学意义(F=0.000 P>0.05);PDWI明显高于T1WI(M=3.0分)、T2WI(M=3.0分)、T2*WI(M=1.0分)、STIR(M=1.0分)及PDFSAT(M=3.0分),P值均<0.01.结论 MRI在显示CCJ韧带结构方面优于CT,PDWI为CCJ韧带的最佳MR成像序列.通过对正常CCJ韧带的影像学研究,能够为该区各韧带病变的诊断和治疗提供客观依据.

Imaging research of normal ligamentous structures in the region of craniocervical junction

Objective To study the imaging characteristics of the ligaments in craniocervical junction (CCJ), and to optimize the examination methods and scanning sequences of the ligaments in this region. Methods Two groups of 51 healthy volunteers in each were selected to undergo CT and MRI examination respectively. The CT and MRI features of the ligaments in CCJ were assessed. Two senior imaging doctors compared the results of showing the ligaments in CCJ by several MRI sequences, including T1 WI ,T2 WI, proton density weighted imaging (PDWI), T2 * WI and short time inversion recovery (STIR) ,and proton density fat saturate (PDFSAT). Standard normal rank transformation was done according to the primary data,and then analysis of variance of repeated measurement was applied. Results CT and MRI could both demonstrate the ligaments (except the anterior atlantooccipital membrane only seen on MRI) and their adjoins in CCJ, while MRI had more advantages than CT. The display ratio of the anterior atlantooccipital membrane was 100% (51/51) by MRI. The display ratio of the apical ligament was 29.4%(15/51) by CT and 43.1% (22/51) by MRI. The posterior atlantooccipital membrane-dura complex,tectorial ligament-dura complex, transverse ligament, and alar ligament could be demonstrated clearly by CT and MRI, the display ratio was 100% respectively (51/51). The results of PDWi scored by two doctors were both 5.0, there were no significant differences between them (F = 0.000, P > 0.05), which were significantly higher than T, WI (M = 3.0), T2Wi (M = 3.0), T2 * WI (M = 1.0), STIR (M = 1.0), and PDFSAT(M = 3.0)(P < 0.01). Conclusion MRI was superior to CT in demonstrating the ligaments in CCJ. PDWI was the optimal MRI sequence. Imaging research of normal ligamentous structures in CCJ could provide valuable diagnostic and therapeutic information for evaluating the ligamentous diseases.