Abstract
In contrast with tissue elasticity imaging, a nonquantitative but high-resolution and real-time image of abdominal tissue strain could be a promising diagnostic tool for ultrasonic visualized palpation using a conventional array transducer. In order to realize the 2D strain imaging, accurate estimation of the lateral displacement perpendicular to the beam axis is required, which overcomes the limitation of the 2D cross-correlation method affected by the data window which determines the spatial resolution and computing efficiency of the estimation. The hierarchical 2D wavelet coefficients of successive complex-valued echo frames were applied to realize the excellent performance of the 2D motion estimate in accuracy, variance, spatial resolution and computational cost. The resultant total performance of this algorithm is evaluated on the basis of physiological free motion to obtain clinical data of hepatocellular carcinoma.
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