Dynamic Analysis of the Muscle Movement with MRI

这项研究的目的是用一种新的磁共振成像(MRI)方法评估股四头肌和腿肌的肌肉内运动。标记快照技术可以通过在与图像部分垂直的平面上施加选择性的180ﾟ脉冲来标记肌肉系统内的多个高强度标记带。在标记和图像获取之间的间隔内的运动被显示为位移和扭曲的标记带。对10名健康志愿者的10条腿进行了检查，其中男7例，女3例。为了测量股四头肌的运动，受试者仰卧，膝盖伸展45度至30度，伸膝15度至0度。对于腿筋，受试者仰卧，屈膝15度至0度。对于比目鱼肌、腓肠肌和胫前肌，受试者仰卧位，进行脚踝背屈和足底屈曲。用标记快照法获得矢状面和冠状面。结果表明，在股四头肌的任何部位均可观察到近端的运动，且远端的运动大于近端的运动。股二头肌、半腱肌和股薄肌短头的任意部位均可观察到近端活动，而股二头肌长头的远端和半膜肌的近端和远端同时出现运动。作为腓肠肌，三个部分的任何部分都向近端移动，它们的运动量之间没有差异。

The purpose of this study was to evaluate intramuscular movement of quadriceps femoris and hamstrings with a new magnetic resonance imaging (MRI) method. Tagging Snapshot technique can label multiple high intensity tagged bands within the musculature by applying selective 180ﾟ pulses in a plane orthogonal to the image section. Motion within the interval between the tagging and the image acquisition are demonstrated as displaced and distorted tagging bands. Ten legs of ten healthy volunteers, seven males and three females, were investigated. To measure the motion of quadriceps femoris, subjects lied in supine position and extended their knees from 45 to 30 degrees and from 15 to 0 degrees, and for hamstrings, lied in prone position and flexed their knees from 15 to 0 degrees. And for soleus, gastrocnemius and tibiaris anterior muscle, subjects lied in supine position, and performed dorsiflextion and plantar-flexion of their ankle. Sagittal and coronal sections with Tagging Snapshot method were obtained. As a results, at any portion of quadriceps femoris, proximal movement was observed, and the movement at distal portion was larger than proximal ones. As hamstrings, at any portion of short head of biceps femoris, semitendinosus and gracilis, proximal movement was observed but at distal portion of long head of biceps femoris and semimembranosus proximal and distal movement was observed at a same time. As gastrocnemius, at any portion of three components moved proximal, and no difference were observed between amount of their movement.