Chracterization of LabVIEW based 16-electrode 2D EIT system
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 6, Issue 3
Abstract
Characterization of EIT system is crucial for validation and calibration. Parameters used for characterization are divided into two groups- first dealing with data quality (SNR, accuracy) and second dealing with image quality (CNR, RNG, reconstructed area).These parameters are useful while selecting a particular EIT system for any new application. Injected current directly affects the data and hence the quality of reconstructed image. Therefore we have studied effect of amplitude of injected current on the EIT data and reconstructed image experimentally. Guidelines are evolved for setting the EIT system to collect useful data for further characterization. We report a set of experiments carried out to characterize a Lab VIEW based 16- electrode 2D EIT system developed in our laboratory. SNR and accuracy for all 208 channels involved in the Sheffield measurement pattern has been calculated. Resolution of EIT system is an important parameter and it depends on both data and image quality and is a combined index for the performance. Uniformity of resolution over the object is also important to preserve shape characteristics of target. We have obtained the resolution of our system experimentally at the centre as well as near the electrodes. It is shown to follow the limits proposed by Seagar relating to the model used for reconstruction and by Isaacson relating to the noise in the measurement.
Authors and Affiliations
Nanda V. Ranade, Damayanti C. Gharpure
Keywords
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