Assessment and Elimination of Errors due to Electrode Displacements in Elliptical and Square Models in EIT
محل انتشار: ششمین کنفرانس ماشین بینایی و پردازش تصویر ایران
سال انتشار: 1389
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,747
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شناسه ملی سند علمی:
ICMVIP06_128
تاریخ نمایه سازی: 20 فروردین 1390
چکیده مقاله:
This study modifies a Tikhonov regularized "maximum a posteriori" algorithm proposed for reconstructing both the conductivity changes and electrode positioning variations in EIT and uses this algorithm for reconstructing images of 2d elliptical and square models , instead of simple circular model used in previous works. This algorithm had been proposed By C.Gomez for compensating the errors due to electrode movements in image reconstruction. The jacobian matrix has been constructed via perturbation both conductivity and electrode positioning. The prior image matrix should incorporate some kind of augmented inter-electrode positioning correlations to impose a smoothness constraint on both the conductivity change distribution and electrode movement. For each model, conductivity change image is reconstructed in 3 cases: a) With no electrode displacement using standard algorithm b) With electrode displacement using standard algorithm c) With electrode displacement using proposed algorithm In all models, a comparison between 3 cases has been implemented. Also, the results obtained from each model have been compared with the other models in similar cases. The results obtained in this study will be useful to investigate the ellipticity effects of organs being imaged in clinical applications. Moreover, the effects of model deviation from circular form on reconstructed images can be used in special industrial applications.
کلیدواژه ها:
نویسندگان
Ashkan Javaherian
Department of Nuclear Engineering, Shiraz University
Amir Movafeghi
Atomic Energy Organization, Nuclear Science and Technology Center
Reza Faghihi
Head of Depatrment of Nuclear Engineering, Shiraz university