A subsample estimator based on zero phase crossing in ultrasound

Fei Zheng, Emad Ebbini

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publication2012 IEEE International Ultrasonics Symposium, IUS 2012
Number of pages4
StatePublished - Dec 1 2012
Event2012 IEEE International Ultrasonics Symposium, IUS 2012 - Dresden, Germany
Duration: Oct 7 2012Oct 10 2012

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727


Other2012 IEEE International Ultrasonics Symposium, IUS 2012


Dive into the research topics of 'A subsample estimator based on zero phase crossing in ultrasound'. Together they form a unique fingerprint.

Cite this