実血管形状脳動脈瘤モデル内のステレオPIV計測(流体工学,流体機械)

概要

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This paper aims to investigate velocity fields in a cerebral aneurysm and also distributions of wall shear stresses (WSS) using stereoscopic particle image velocimetry (stereoscopic PIV) measurement of flow in an in vitro model. The present in vitro model has the realistic vessel geometry of middle cerebral artery (MCA) , which is reconstructed from computed tomography (CT) images. Since stereoscopic PIV is applied to the measurement, a new calibration technique has been developed in order to measure the flow in complex geometry. In this method, two laser beams are used to create to create calibration points. And the accuracy of this method is comparable with that of the conventional calibration technique using a calibration plate. The experimental results at the steady state show that the flow from the parent artery mostly goes into the aneurysm rather than into the branching arteries. Two vortices along the aneurysm are observed in the measurement model. The WSS are calculated from the velocities, which are obtained by the PIV measurement. The result shows that the magnitude of WSS averaged over the aneurysm is lower than that of WSS averaged over the rest of the blood vessels.
社団法人日本機械学会の論文
2006-10-25