Statistical analyses were performed using the SSPS software (IBM SPSS Statistics 21; IBM, Korea). Intra-class correlation coefficient (ICC) was used to compare the coherence of each variable for intra- and inter-observer reproducibility. For comparing the percentage accuracy of shape accuracy between the 2 elastography systems, a t-test was used. A P value <.05 was considered statistically significant.

Approval of an ethics committee or institutional review board was not necessary for this experimental study using phantom.

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