Title :
Accelerated Levenberg-Marquardt method with an optimal step length in electrical capacitance tomography
Author :
Smolik, Waldemar T.
Author_Institution :
Inst. of Radiolelectronics, Warsaw Univ. of Technol., Warsaw, Poland
Abstract :
Electrical capacitance tomography (ECT) is a fast, low cost imaging technique but offers very low spatial resolution. A modified Levenberg-Marquardt (LM) algorithm for image reconstruction in ECT is presented. To accelerate the convergence rate an additional acceleration term is added to the conventional LM. The method for the optimal step length dynamic calculation is applied. The results of application of these modifications of the LM algorithm for 2D image reconstruction of numerical and real phantoms are presented. The 16 electrodes ETC tomograph was used for real data registration.
Keywords :
electric impedance imaging; image reconstruction; image registration; imaging; tomography; accelerated Levenberg Marquardt method; data registration; electrical capacitance tomography; image reconstruction; imaging technique; optimal step length; spatial resolution; Acceleration; Cost function; Electrical capacitance tomography; Electrodes; Image reconstruction; Iterative algorithms; Jacobian matrices; Linear approximation; Permittivity; Spatial resolution; component; convergence rate; electrical capacitance tomography; iterative Levenberg-Marquardt method; optimal step length;
Conference_Titel :
Imaging Systems and Techniques (IST), 2010 IEEE International Conference on
Conference_Location :
Thessaloniki
Print_ISBN :
978-1-4244-6492-0
DOI :
10.1109/IST.2010.5548490
