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Journal of Applied Sciences

Year: 2012 | Volume: 12 | Issue: 6 | Page No.: 518-534
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Authors

Ashkan Javaherian

Amir Movafeghi

Reza Faghihi

Effat Yahaghi

Keywords

Research Article

Assessment of Contrast Positioning Effects on Reconstructed Images of Elliptical Models in EIT Applying Different Current Patterns

Ashkan Javaherian, Amir Movafeghi, Reza Faghihi and Effat Yahaghi
This study investigates the effects of contrast region positioning on reconstructed EIT images, using an elliptical model in which a contrast displaces aligned by the horizontal and vertical axes of the ellipse. Different common current-voltage patterns have been applied as well. The results obtained from the elliptical model could be applicable for estimating the anisotropy or ellipticity effects of the human body's cross-section on reconstructed EIT images. The models are defined based on two variable factors which are either the direction of the contrast movement in the ellipse, or different current-voltage patterns. The ability of the various current-voltages patterns to reconstruct images of the moving contrast as a function of contrast positioning in the models is compared. This ability has been investigated using four figures of merit which are the distinguishability of the forward models and also blur radius, artefact amplitude measure and position error of the reconstructed images. This comparison can be useful in cases in which the Region of Interest (ROI) location has been estimated before EIT measurements via either anatomical structure mapping or using other modalities such as ultrasound, MRI, etc. In addition, we show that the distinguishability measures cannot definitively be an exhaustive criterion for predicting the quality of the reconstructed images.
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