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目的探索磁共振全泪道成像的可行性方法,并优选最佳扫描方案。方法选择30例无如何眼疾的健康志愿者(60侧泪道)进行泪道MRI检查。检查前向双侧结膜囊内滴入玻璃酸钠滴眼液,采用颈动脉线圈,30例均行3D-CISS(结构干扰稳态进动成像)、3D-SPC(可变翻转角快速自旋回波)和2D-TSE(快速自旋回波)序列扫描,其中8例加扫3D-DE(双回波稳态进动成像)和3D-ME(多回波合并成像)序列。分析各序列原始图像,并进行最大强度投影(MIP)处理。观察不同序列图像的泪道各结构的显示情况。结果 3D-CISS、3D-SPC和2D-TSE序列均可全程显示泪道各结构,但以2D-TSE显示最佳,其图像对比度和信噪比高,对泪道各部分的显示率均可达到接近100%,3D-SPC序列显示率也达到80%以上。结论采用高分辨率颈动脉线圈和玻璃酸钠滴眼充盈泪道的方法,可完美实现全泪道无创成像。薄层2D-TSE序列可作为泪道检查的优选序列,3D-SPC序列可作为补充序列。
Objective To explore the feasibility of magnetic resonance whole lacrimal imaging and to optimize the optimal scanning scheme. Methods Thirty healthy volunteers (60-sided lacrimal duct) with no eye disease were selected for lacrimal MRI. Before the examination, sodium hyaluronate eye drops were infused into the bilateral conjunctival sac. The carotid artery coils were used in 30 patients. 3D-CISS (Steady-state imaging of structural disturbance), 3D-SPC Wave) and 2D-TSE (fast spin echo) sequence scans were performed, of which 8 were 3D-DE (dual echo steady-state precession imaging) and 3D-ME (multiple echo imaging) sequences. The original images of each sequence were analyzed and subjected to Maximum Intensity Projection (MIP). Observation of different sequences of images of the tear lacrimal structure of the display. Results 3D-CISS, 3D-SPC and 2D-TSE sequences could all display the structures of lacrimal passages. However, 2D-TSE showed the best results with high image contrast and signal-to-noise ratio. Nearly 100%, 3D-SPC sequence display rate of more than 80%. Conclusion High-resolution carotid artery coil and sodium hyaluronate filled lacrimal passage method can be completely achieved without lacrimal imaging. A thin layer 2D-TSE sequence can be used as a preferred sequence for lacrimal examination, and a 3D-SPC sequence can be used as a complementary sequence.