三维双回波稳态进动序列在正常青年人腕管内正中神经的应用研究

目的 探讨正常青年人腕管内正中神经的MRI表现及解剖参数。方法 测量25名健康志愿者正中神经桡骨远端及豆状骨层面截面积（CSA1、CSA2），计算肿胀率（MNSR）、扁平率（MNFR）、腕横韧带弓形率（FRAR），将上述数据与年龄、腕围、体质指数（BMI）进行相关性分析，并统计以上所有数据的95%置信区间。结果 25名健康志愿者的CSA1、CSA2分别为（8.34±1.46）和（9.40±1.97）mm²，MNSR、MNFR和FRAR分别为（1.13±0.18）、（2.41±0.73）和（0.06±0.02）；MNFR与腕围、BMI存在正相关（r=0.51、0.46，P<0.05）；CSA1与腕围存在负相关（r=-0.51，P<0.05）。结论 三维回波稳态进动序列显示正中神经更清晰，测量更准确，利于腕管综合征的早期诊断。

Application value of MRI 3D-DESS sequence in carpal tunnel: quantitative anatomy of median nerve in healthy young people

Objective To investigate the MRI anatomical parameters of the median nerve in the carpal tunnel of healthy young people.Methods Twenty-five cases of young healthy volunteers underwent conventional 3.0T magnetic resonance 3D Double-Echo Steady-State sequence scanning of the non-dominant wrist. Cross-sectional area of the median nerve at distal radius plane(CSA1) and lentiform bone plane(CSA2)were measured. The median nerve swelling rate(MNSR), the median nerve flattening rate(MNFR), and the transverse carpal ligament bow rate(FRAR) were calculated. A correlation analysis between the above data and general situation were calculated, and the 95% confidence interval of all data was determined as well.Results The average value of CSA1, CSA2 was(8.34±1.46)mm², (9.40±1.97)mm² respectively. The average value of MNSR, MNFR, FRAR was(1.13±0.18), (2.41±0.73), (0.06±0.02) respectively. There was a statistically significant positive correlation between MNFR and wrist circumference(r=0.51, P=0.01), as well as MNFR and BMI(r=0.46, P=0.02). Negative correlation between CSA1 and wrist circumference(r=-0.51,P=0.01) was found.Conclusion The 3D Double-Echo Steady-State sequence, which provides abundant and accurate diagnosing information in the measurement of the median nerve, plays an important role in the early diagnosis of carpal tunnel syndrome.