磁気共鳴画像(MRI)を用いた指尖部およびpulpの力学的変形解析

概要

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The center of the finger pulp in 3 men was deformed 8 mm proximal to the distal end of the finger by compression using a φ4 hemisphere, φ5 cylinder, and flat plate at compressive loads of 1N and 3N. The angle between the object and the central axis of the fingertip was 30°. With or without a compressive load, magnetic resonance imaging (MRI) scans of the transverse section were performed beginning from the distal end of the finger to a 22-mm point proximal to the distal end at a slice spacing of 1 mm. Three extraction parameters (cross-sectional area, pulp cross-sectional area, and thickness of the central fingertip) were measured from the MRI scans. For each extraction parameter, the maximum compression strain with and without a compressive load was calculated from the MRI scans. The cross-sectional area measurements of the fingertip revealed a local displacement, which spread radially from a center of concentrated load. The pulp cross-sectional area values revealed that the fat present in the deformed pulp was displaced to other compartments. The maximum compression strain of the finger achieved with the plate tended to be lower than that achieved with the sphere or cylinder. This observation may be attributed to the fact that the load with the sphere or cylinder was supported locally.