Abstract
Transcatheter aortic valve replacement (TAVI) is a less invasive therapy and the number of operations is increasing. In some operations of TAVI, valve annulus rupture and failure were happened. Strain measurement method in the blood vessel has not been established and there is no way to evaluate the strain distribution experimentally. It is difficult to measure large deformation of the blood vessel using conventional digital volume correlation with computed tomography. This study presents a new strain measurement method of an elastic blood vessel model using the displacement distribution measured by tomographic particle image velocimetry. Tracer particles were distributed in the blood vessel model and displacement distribution was measured by tracking the particles. The displacement measuring accuracy affected by the amount of displacement and spatial resolutions was assessed. The strain yielded in the blood vessel model, when it was 10% expanded, was measured in the optimal condition determined by the accuracy measurement. In this study, the optimal displacement spatial resolutions and displacement condition were 64 X 64 X 64 voxel^3 and 90-150 μm respectively. This experimental investigation revealed that the higher strain was yielded in the inner wall of the blood vessel model and the strain becomes lower toward the outer wall.
