肩关节柔性线圈MR扫描图像质量影响因素探讨

An investigation on the impact factor on the shoulder joint MR image quality acquired with the flexible coil

目的探讨采用柔性线圈行肩关节磁共振扫描时的影像质量影响因素。方法对比采用胸式呼吸与腹式呼吸下的影像质量影响因素,对比不同肩部厚度患者的影像质量,对比线圈松紧程度对影像质量的影响,80例患者行MRI检查,共400个序列,其中甲级片腹式呼吸310个,乙、丙级片90个,其中胸式呼吸患者40个、肥胖患者30个,线圈绑太紧20个。结果胸式呼吸较腹式呼吸产生更多的运动伪影,较厚的肩部影像信噪比(SNR)较低,线圈缠绕过紧导致更多的运动伪影。结论采用柔性线圈行肩关节磁共振扫描前应进行积极的检查前训练,减少因肥胖或呼吸方式不对引起胸廓运动幅度加大而导致伪影加重;线圈不宜缠绕过紧,线圈与肩关节之间应保留空隙。

Objective To investigate the impact factor on image quality of shoulder joint MRI acquired with flexible coil. Methods We compared the image quality of the images acquired with thoracic breathing vs. abdominal breathing, and on patients with different thickness of the patient＇s shoulder, and different coil coupling tightness. Results Thoracic breathing caused more motion artifacts than abdominal breathing, the image signal-to- noise ratio （SNR） of people with thicker shoulder were low, coil that was too tight led to more motion artifacts. Conclusion Proper training should be carried out before the MRI scan with flexible coil line for shoulder joint is performed. This will reduce motion artifacts caused by obesity or error breath way; Coil should not be too tight, should keep space between the coil and the shoulder joint.