TY - GEN
T1 - A subsample estimator based on zero phase crossing in ultrasound
AU - Zheng, Fei
AU - Ebbini, Emad
PY - 2012/12/1
Y1 - 2012/12/1
N2 - Displacement estimation in ultrasound is a common yet important task for various applications, including tissue/blood motion, elastragraphy imaging, temperature estimation, etc. Due to the discrete feature of window-based cross correlation, an accurate subsample displacement estimator is in great demand with higher and higher frame rate. In this paper, we present a zero phase crossing method based on complex cross correlation. The novelty of this technique is twofold. First, the phase of complex cross correlation is linear. Second, the subsample of maximum magnitude of complex correlation lies in zero phase line. Therefore, subsample displacement can be easily estimated by finding the zero phase crossing. Simulation results shows that this method has a better performance than other estimators, including parabolic fitting, cubic fitting, cosine fitting, etc, in terms of bias and standard deviation under various conditions. The computational cost of this technique is also considered for real-time implementation.
AB - Displacement estimation in ultrasound is a common yet important task for various applications, including tissue/blood motion, elastragraphy imaging, temperature estimation, etc. Due to the discrete feature of window-based cross correlation, an accurate subsample displacement estimator is in great demand with higher and higher frame rate. In this paper, we present a zero phase crossing method based on complex cross correlation. The novelty of this technique is twofold. First, the phase of complex cross correlation is linear. Second, the subsample of maximum magnitude of complex correlation lies in zero phase line. Therefore, subsample displacement can be easily estimated by finding the zero phase crossing. Simulation results shows that this method has a better performance than other estimators, including parabolic fitting, cubic fitting, cosine fitting, etc, in terms of bias and standard deviation under various conditions. The computational cost of this technique is also considered for real-time implementation.
UR - http://www.scopus.com/inward/record.url?scp=84882384118&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84882384118&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2012.0426
DO - 10.1109/ULTSYM.2012.0426
M3 - Conference contribution
AN - SCOPUS:84882384118
SN - 9781467345613
T3 - IEEE International Ultrasonics Symposium, IUS
SP - 1698
EP - 1701
BT - 2012 IEEE International Ultrasonics Symposium, IUS 2012
T2 - 2012 IEEE International Ultrasonics Symposium, IUS 2012
Y2 - 7 October 2012 through 10 October 2012
ER -