STATIC IMAGE RECONSTRUCTION METHOD USING ADAPTIVE MESH-GROUPING METHOD IN ELECTRICAL IMPEDANCE TOMOGRAPHY, FOR IMPROVING SPATIAL RESOLUTION BY DECREASING THE NUMBER OF ELEMENTS IN INVERSE PROBLEM CALCULATION PROCESS

摘要

PURPOSE: A static image reconstruction method is provided to prevent an ill posedness problem and improve spatial resolution, by decreasing the number of elements in an inverse problem calculation process in an electrical impedance tomography. CONSTITUTION: A static image reconstruction method comprises a step(S10) of setting an initial value for estimating distribution of electrical characteristics of an object; a step(S20) of measuring and storing all voltages induced to an electrode; a step(S30) of calculating and storing all voltages induced to the electrode by a finite element method; a step(S40) of calculating an initial resistivity distribution value; a step(S50) of calculating and storing all voltages induced to the electrode and Jacobian matrix; a step(S60) of updating the subsequent resistivity distribution value; a step(S70) of calculating and storing all voltages induced to the electrode and Jacobian matrix; a step(S80) of calculating a root mean square error; a step(S90) of judging whether the root mean square error falls within the error range set in the step(S10), and ending a program if the root mean square error falls; a step(S100) of classifying the root mean square error into three groups; a step(S110) of constituting a grouping matrix; a step(S120) of constituting a grouped resistivity value, grouped Jacobian matrix, and a grouped regularization matrix by using the grouped matrix; a step(S130) of updating the grouped resistivity; a step(S140) of canceling the group and obtaining a resistivity value; a step(S150) of calculating and storing all voltages induced to the electrode and Jacobian matrix; and a step of repeating the steps(S10 to S15).