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A new method based on SEM for estimating size of the stent during implantation in the artery was introduced. The proposed approach benefits the fact that the imaginary parts of the natural poles are correlated with the dimensions of the stent structure throughout expansion. The results of simulation of a stent at six stages of expansion demonstrated that the poles are moving in the complex plane as the stent expands. The moving poles create a pole map to identify size of the stent in the artery. The validity of the idea was also confirmed by measuring the responses of two stent samples in free space. ACKNOWLEDGMENTS