IFEM and PSO algorithms for Young's modulus reconstruction

To get the quantitative value of the abnormal biological tissues, an inverse algorithm a-bout Young's modulus based on boundary extraction and image registration technology is proposed. With the known displacements of boundary tissues and the force distribution, the Young's modulus is calculated by constructing the unit system and using the inverse finite element method (IFEM). Then a tough range of modulus for the whole tissue is estimated referring the value obtained before. The improved particle swarm optimizer (PSO) method is adopted to calculate the whole Yong's modulus distribution. The repetitious numerical simulation shows that errors in boundary displacement are not very sensitive to the estimation of next process; a final feasible solution is obtained by the improved PSO method which is close to the theoretical values during searching in an extensive range.