Dynamic Analysis of the Muscle Movement with MRI

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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.