Evaluation of Phase Characteristics in a Stationary Region in Phase-contrast Method Using Divided Ranges

Abstract

Shear stress and stress in biological tissue are related to disease progression. The shear stress and the stress are decided by the velocity profile and its shape respectively. Both types change dynamically and hence should be measured at the same time. The phase-contrast method, which measures the velocity by the phase, could be used for detecting the shape if the characteristics of the phase in the stationary region are estimated properly. Moreover, the relaxation time is differed by tissues. Hence, in this study, the influence of the relaxation time on the phase distribution in the stationary region was investigated using a particle, which is a cluster of the neighboring points in the divided range. The phase characteristics in the stationary region reflected the relaxation times. The elongation direction of the particle would be important to evaluate the shape of the biological tissue.