A FEM-Based Forward Solver for Studying the Forward Problem of Electrical Impedance Tomography (EIT) with A Practical Biological Phantom

Abstract

A Finite Element Method based forward solver is also depends on the Jacobean matrix formation, regularization developed for solving the forward problem of a 2D-Electrical technique and the converging nature of iterative algorithm Impedance Camera [15], was constructed by Henderson and E_ Webster to study the pulmonary edema in 1978. But due to VQtag poor signal to noise ratio [2] and poor spatial resolution [16] Measrementimaging. The reconstructed image quality in impedance tomography greatly depends on the performance of forward solver and the measurement errors which is influenced by the phantom geometry, electronic behavior of the current injector, Figure-i: An EIT system with electrode array on the domain to be imaged.data acquisition module and signal conditioners. Image quality 978-1-4244-2928-8/09/$250OO

A MATLAB-Based Boundary Data Simulator for Studying the Resistivity Reconstruction Using Neighbouring Current Pattern

“…In IDS, a circular domain (Ω) to be imaged is defined with a required radius ( R p ) using the Cartesian coordinate system ( Figure 1(a) ), and the domain is discretized with a finite element (FE) mesh ( Figure 1(b) ). The mesh is symmetrically composed of the first-order triangular elements with linear shape functions [ 18 , 31 ]. The FE mesh is generated with the pdetool of MATLAB R2010a in such a way that it can be refined further to increase the number of elements as per the requirement.…”

A Chicken Tissue Phantom for Studying an Electrical Impedance Tomography (EIT) System Suitable for Clinical Imaging

“…The conductivity (r k ) is modified to r k?1 = r k ? rD for a number of iterations using the Modified Newton-Raphson method [29]. The iteration process is continued until we obtain a specified error limit (e) which is a function of DV as shown in Fig.…”

“…This is generally performed with a practical phantom mimicking the patient's body parts. Researchers have reported several types of phantoms for studying their EIT systems such as [26][27][28][29], saline-agar phantom [30][31][32], saline-vegetable phantom [2,33,34], and passive or active element phantoms [35,36]. The phantoms with electrical components are sometimes advantageous due to their long life, rigidity, stability and ease of control.…”

A battery-based constant current source (Bb-CCS) for biomedical applications

“…Being a bioimpedance tomographic technique EIT has several advantages over other impedance methods and other tomographic methods and hence it is being studied by a number of research groups. As the number of available EIT instruments is very few, the constant current injectors are usually developed, studied and evaluated in EIT phantom studies [57][58][59][60][61][62][63][64][65][66][67]. To obtain a higher measurement accuracy BIA, IPG, EIM, ICG, EIS, EIT all need a high precision impedance measurement circuit or impedance measurement instrument such as impedance analyzer ( Fig.…”