Estimation of Local Displacement Vector in Random Medium Utilizing Synthetic Aperture Array Signal Processing

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  • Minochi Yusuke
    Medical Imaging Laboratory, Graduate School of Information Science, Meisei University
  • Yagi Shin-ichi
    Medical Imaging Laboratory, Graduate School of Information Science, Meisei University
  • Nishiyama Tomohide
    Medical Imaging Laboratory, Graduate School of Information Science, Meisei University

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Real-time imaging of dynamical movement or stress distribution across living tissues by physiological internal or clinical external stress forces could be a promising tool for clinical diagnosis as visualized palpation. However, the transversal components of tissue local motion across an ultrasonic beam cannot be obtained utilizing conventional beam scanning. We proposed the combined algorithm of phase sensitive spatial cross-correlation between two sequential speckle echo frames and signal processing for a synthetic aperture of an array transducer which realizes a uniform spatial resolution through these echo frames. The two-dimensional local motion vector can be directly calculated from the sequentially estimated local phase changes by successive irradiation of different point sources. The accuracy and the statistical variance of the estimated two-dimensional displacement were investigated for the simulated random tissue and the received speckle echo frames from it. The obtained results showed the excellent performance of the proposed algorithm, both for local values and for the entire distribution of estimated displacement vectors throughout the measured medium.

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