3．0T磁共振高分辨质子加权成像观察健康青少年颈横韧带

3.0T-MR high resolution proton density weighted imaging for transverse cervical ligament in healthy adolescents

目的:探讨健康青少年颈横韧带的高分辨影像特点,为进一步认识韧带损伤奠定基础。方法:应用3.0T磁共振对32例青少年志愿者颈横韧带进行质子加权序列成像(proton density weighted imaging,PDWI),扫描方向选择冠状位、横轴位及矢状位,观察其形态、厚度、走行及信号特点。结果:高分辨PDWI能够清晰显示颈横韧带的解剖结构及信号特征,冠状位联合横轴位能够有效显示横韧带的全貌,横韧带位于齿状突后方呈半弧状连接于两侧块内侧,长(20.4±3.3)mm,中心结构厚,向四周逐渐变薄,中部宽(7.3±0.6)mm,在两侧附着处宽度变小,中部厚(2.1±0.4)mm,横韧带在PDWI上75%呈均匀低信号,25%局部出现高信号。结论:3.0T高分辨PDWI是一种有效评价颈横韧带结构的影像学方法;局部高信号并非韧带损伤的绝对指征,正常青少年韧带结构中也存在部分高信号,在临床诊治过程中应加以注意。

Objective： To explore the imaging characteristics of the transverse ligament in healthy adolescents, and further understand the imaging characteristics of the ligament injur）n Methods： We used 3.0T-MR to scan the transverse ligament with proton-weighted sequence in 32 young volunteersj scanned coronall） horizontally and sagittall） and then observed the morpholog~ thickness, running and signal characteristics of the ligament. Results： The anatomy and signal characteristics of the transverse cervical ligament were clearly displayed by high resolution proton density weighted imaging （PDWI）. The whole picture of thetransverse ligament was effectively displayed by coronal combined with horizontal image. The transverse ligament was located in the rear of the odontoid, and connected to the inside of both sides of the block like half-arc. The length was （20.4±3.3） mm, the ligament center was the thickest, and both sides gradually became thinner. The middle width of the ligament was （7.3±0.6） mm, the ligament ends narrowed down, and the middle was （2.1±0.4） mm thick; 75% of the transverse ligament showed homogeneous low signal in PDWI, while 25% of the local transverse ligament had high signal. Conclusion： High resolutiori PDWI with 3.0T-MR is a effective method to evaluate the structure of the transverse cervical ligament. Local high signal may not necessarily be the sign of ligament injure. There may also be some high signal in the normal adolescent ligament, so we must pay much attention to clinical diagnosis and treatment.