2D image reconstruction of a human chest by using Calderon's method and the adjacent current pattern

• Published in: Journal of instrumentation Vol. 8; no. 3; p. P03004
• Main Authors: Cao, Z, Xu, L
• Format: Journal Article
• Language: English
• Published: 01.03.2013
• Subjects: Boundaries; Chest; Electrical impedance; Image reconstruction; Mathematical analysis; Scattering; Tomography; Transforms
• ISSN: 1748-0221; 1748-0221
• DOI: 10.1088/1748-0221/8/03/P03004

In this paper, Calderon's method is applied to a chest-like sensing region, as monitored by electrical impedance tomography. This method provides a direct algorithm for image reconstruction, where the gray value at any pixel of the reconstructed image is computed using a direct and independent approach. The major calculations of image reconstruction in Calderon's method are implemented for a circular boundary and, as a result, the complicated calculations of the scattering transform, as required by non-circular boundaries, are avoided. A unique conformal transformation is used to map a unit disk onto a sensing region with a non-circular boundary, such as a chest-like region. A new method to calculate the Dirichlet-to-Neumann map is also introduced, which is used to compute the scattering transform. The feasibility of the proposed method has been validated by testing the construction of phantoms with chest-like boundaries. Data collected from the chest of a male subject has been used to visualize lung movement, as monitored by the electrical impedance tomography system.