Title :
Time-efficient and exact algorithms for adaptive temporal stretching and 2D-correlation for elastographic imaging using phase information
Author :
Pesavento, A. ; Ermert, H.
Author_Institution :
Dept. of Electr. Eng., Ruhr-Univ., Bochum, Germany
Abstract :
Recently, we developed an algorithm for fast and accurate time shift measurement using an iterative algorithm which calculates the time shift of two signals by iteratively seeking the zero of the phase of the complex correlation function. Typically only 2 or 3 iterations are needed. With this contribution we extended the algorithm to perform an estimation and correction of lateral displacements and adaptive temporal stretching. Both significantly reduce the noise of the strain estimation
Keywords :
Newton method; acoustic correlation; adaptive signal processing; biological tissues; biomechanics; biomedical ultrasonics; decorrelation; elasticity; interpolation; medical image processing; motion estimation; 2D-correlation; Newton iteration; adaptive temporal stretching; complex correlation function; decorrelation; elastographic imaging; exact algorithms; homogeneous sponge; interpolation; iterative algorithm; lateral displacements; phase information; phase root seeking; strain estimation noise; time shift; time-efficient algorithms; Algorithm design and analysis; Capacitive sensors; Decorrelation; Delay estimation; Frequency estimation; Interpolation; Iterative algorithms; Phase estimation; Signal analysis; Signal processing algorithms;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765291
