不同线圈在3.0T MR颈动脉颅外段血管壁成像中的应用价值

Application of Different Coils in MR Imaging of Extracranial Carotid Artery Wall at 3.0T

目的探讨不同射频线圈在颈动脉颅外段高分辨率磁共振血管壁成像(HRMR-VWI)中的应用价值。方法将符合入组标准的30例患者,分别使用12通道头颈线圈和8通道表面线圈行斜冠状位CUBE T1WI序列扫描,同时获得两组图像。客观测量并计算出双侧颈动脉颅外各分段管腔中心和胸锁乳突肌的信噪比(SNR),比较两组间各段SNR的统计学差异;由两位高年资医生采用双盲法对图像质量进行主观评分,统计两位医生的评分kappa值。结果表面线圈组检查成功率96.6%(29/30)优于头颈组90%(27/30);表面线圈组在颈总、颈动脉窦、颈动脉C1段、胸锁乳突肌各段的SNR均显著高于头颈线圈组(P<0.05);两位医生对头颈线圈组和表面线圈组各分段图像质量评估的Kappa值分别为0.402、0.683。结论应用8通道表面线圈能更清晰的显示颈动脉颅外段血管壁的解剖结构和病变特征;表面线圈组在图像质量和患者配合度方面都优于头颈线圈组,因此表面线圈可作为3.0T MR颈动脉颅外段血管壁检查首选。

ObjectiveTo investigate the application value of different radiofrequency coils in high-resolution magnetic resonance vessel wall imaging(HRMR-VWI)of extracranial carotid artery.MethodsA total of 30 patients who metthe inclusion criteriawere divided into 12 head and neck coils and 8 surface coils at the same time for oblique coronal CUBE T1 sequence scanning.The image quality was evaluated by two senior physicians by double-blind method,and the signal-to-noise ratio(sNR)of the luminal center of bilateral carotid artery and sternocleidomastoid muscle in each segment was calculated,and the differences between the two groups were compared.According to the clarity of vessel wall structure displayed in the analyzed imaging sequence,the image quality was divided into four levels:level 2-4 could meet the diagnosis,and level 1 could not meet the diagnosis.The Kappa value of the two doctors was calculated.ResultsThe success rate of surface group examination was 96.6%(29/30)>90%(27/30)in head and neck group;The sNR of the common neck,carotid sinus,carotid artery C1 segment and sternocleidomastoid muscle in the CUBE T1 sequence surface group were significantly higher than those in the head and neck group(P<0.05);The Kappa values of each segment image quality assessment of head and neck and surface group were 0.402 and 0.683,respectively.ConclusionThe application of the 8-channel surface coil can show the anatomical structure and lesion characteristics of the extracranial segment of carotid artery more clearly,and has higher image quality and patient cooperation than the head and neck coil.It can be used as the first choice for MR examination of the extracranial segment of carotid artery at 3.0T.