A ROBUST IMAGE-RECONSTRUCTION ALGORITHM AND ITS PARALLEL IMPLEMENTATION IN ELECTRICAL-IMPEDANCE TOMOGRAPHY

Citation
Ej. Woo et al., A ROBUST IMAGE-RECONSTRUCTION ALGORITHM AND ITS PARALLEL IMPLEMENTATION IN ELECTRICAL-IMPEDANCE TOMOGRAPHY, IEEE transactions on medical imaging, 12(2), 1993, pp. 137-146
Citations number
23
Categorie Soggetti
Engineering, Biomedical","Radiology,Nuclear Medicine & Medical Imaging
ISSN journal
02780062
Volume
12
Issue
2
Year of publication
1993
Pages
137 - 146
Database
ISI
SICI code
0278-0062(1993)12:2<137:ARIAAI>2.0.ZU;2-V
Abstract
We have developed an efficient and robust image reconstruction algorit hm for static impedance imaging using Hachtel's augmented matrix metho d. This improved Newton-Raphson method produced more accurate images b y reducing the undesirable effects of the ill-conditioned Hessian matr ix. We demonstrated that our electrical impedance tomography (EIT) sys tem could produce two-dimensional static images from a physical phanto m with 7 percent spatial resolution at the center and 5 percent at the periphery. Static EIT image reconstruction requires a large amount of computation. In order to overcome the limitations on reducing the com putation time by algorithmic approaches, we implemented the improved N ewton-Raphson algorithm on a parallel computer system and showed that the parallel computation could reduce the computation time from hours to minutes.