磁共振三维水激发序列对踝关节软骨成像的影响  

Comparation of MRI 3D-WE sequence in ankle cartilage imaging

作　　者：张乾营[1] 刘旭红 黄莹[1] 韩晓兵 章思竹 阿浣 张善幽 刘娜红 何桂凤[1] ZHANG Qianying;LIU Xuhong;HUANG Ying;HAN Xiaobing;ZHANG Sizhu;A Huan;ZHANG Shanyou;LIU Nahong;HE Guifeng(Department of Radiology,910 Hospital,Joint Logistics Support Force,PLA,Quanzhou 362000,China)

机构地区：[1]中国人民解放军联勤保障部队第910医院放射诊断科,福建泉州362000

出　　处：《分子影像学杂志》2022年第4期572-575,共4页Journal of Molecular Imaging

基　　金：泉州市科技计划项目(2018Z148)。

摘　　要：目的通过比较3种踝关节三维水激发序列中,软骨的信噪比(SNR)和对比噪声比(CNR),分析3D MR序列显示关节软骨的优缺点。方法选取30名志愿者(年龄18~25周岁),均进行3种3D踝关节软骨MRI扫描,利用Skyra 3.0T MR和头颈联合Head/Neck 18通道线圈。双回波稳态进动(DESS)序列、多回波数据图像重合(MEDIC)序列、三维容积内插快速扰相,容积内插体部检查(VIBE)。在踝关节胫距关节中央层面分别测量踝关节软骨、肌间脂肪、距骨骨髓、拇长屈肌和软骨滑液的SNR、背景噪声信号强度,通过软件计算软骨SNR和软骨-脂肪(CNR_(ca-Fat))、软骨-骨髓(CNR_(ca-Bone))、软骨-肌肉(CNR_(ca-Muscle))和软骨-滑液(CNR_(ca-Fluid)),同时对不同序列显示踝关节软骨的能力进行评价。结果MEDIC序列、VIBE序列的SNR高于DESS序列,差异有统计学意义(P<0.05)。VIBE序列、DESS序列、MEDIC序列的CNRca-Fat差异有统计学意义(12.75±2.78 vs 6.72±2.09 vs 15.07±3.89,P<0.05)。VIBE序列、DESS序列、MEDIC序列的CNR_(ca-Bone)差异有统计学意义(12.88±2.46 vs 7.32±2.07 vs-1.75±1.95,P<0.05),CNR_(ca-Muscle)差异有统计学意义(2.28±0.71 vs 1.17±1.27 vs-1.15±2.17,P<0.05),CNR_(ca-Fluid)差异有统计学意义(1.37±1.31 vs-5.62±6.01 vs-3.28±3.06,P<0.05)。结论与DESS、MEDIC序列相比,VIBE能更为清晰地显示踝关节软骨的细微解剖结构及边缘,与周边关节腔积液分界更清楚,能够清晰准确地显示踝关节软骨各种三维数据,是软骨厚度、体积等测量计算的准确工具。Objective To analyze the advantages and disadvantages of 3D MR sequences in displaying articular cartilage by comparing the signal to noise ratio(SNR)and contrast to noise ratio(CNR)of cartilage in three kinds of ankle 3D water excitation(3D-WE)sequences.Methods Thirty volunteers(aged 18-25 years old)were selected to perform three kinds of 3D MRI scans of ankle cartilage,using Siemens skyra 3.0T MR and head/neck 18 channel coil.Dual echo steady state(DESS)sequence,multi echo data image combination(MEDIC)sequence,three-dimensional volume interpolation fast phase scrambling,volume interpolated body examination(VIBE).The SNR_(ca-x) and signal intensity of ankle cartilage,fat,bone,muscle,fluid were measured at the central level of the tibiotalar joint of the ankle joint.The cartilage of SNR and CNR_(ca-Fat),CNR_(ca-Bone),CNR_(ca-Muscle) and CNR_(a-Fluid) were calculated by computer.At the same time,the ability of different sequences to display ankle cartilage is evaluated.Results The value of SNR of MEDIC and VIBE were significantly higher than that of DESS(P<0.05).The values of CNR_(ca-Fat) between VIBE,DESS and MEDIC were significantly different(12.75±2.78 vs 6.72±2.09 vs 15.07±3.89,P<0.05).The value of CNR_(ca-Bone) between VIBE,DESS and MEDIC were significantly different(12.88±2.46 vs 7.32±2.07 vs-1.75±1.95,P<0.05).The value of CNR_(ca-Muscle) between VIBE,DESS and MEDIC were significantly different(2.28±0.71 vs 1.17±1.27 vs-1.15±2.17,P<0.05).The CNR_(ca-Fluid) value between VIBE,DESS and MEDIC were significantly different(1.37±1.31 vs-5.62±6.01 vs-3.28±3.06,P<0.05).Conclusion Compared with DESS and MEDIC sequences,VIBE can more clearly display the fine anatomical structure and edge of ankle cartilage.The boundary with the surrounding joint cavity effusion is clearer.It can clearly and accurately display various three-dimensional data of ankle cartilage.It is an accurate tool for measuring and calculating the thickness and volume of cartilage.

关 键 词：踝关节 软骨 三维水激发序列 信噪比 对比噪声比 

分 类 号：R445.2[医药卫生—影像医学与核医学] R684[医药卫生—诊断学]