TY - JOUR
T1 - Comparison of shift estimation strategies in spectral elastography
AU - Hoyt, Kenneth
AU - Forsberg, Flemming
AU - Ophir, Jonathan
N1 - Funding Information:
This work was supported by the National Institutes of Health (USA) Program Project Grant P01-CA64597.
PY - 2006/1
Y1 - 2006/1
N2 - This paper compares the performance of various spectral shift estimators for use in spectral elastography, namely, the normalized cross-correlation (NCC), sum squared difference (SSD) and sum absolute difference (SAD). Simulation and experimental results demonstrate that the spectral SSD-based elastographic method exhibits no marked difference in performance compared to the more computationally costly NCC-based approach, which has conventionally been the preferred estimator in spectral elastography. The spectral SAD-based strain estimator, despite being computationally less burdening, failed to exhibit performance comparable to that of the NCC- and SSD-based techniques. Furthermore, though spectral subsample estimation techniques using a cosine-fit interpolation method outperformed that of the parabolic-fit method in terms of both reduced bias errors and standard deviations, the latter was analyzed in this study due to computational simplicity. The role of spectral density was evaluated without and with parabolic-based subsample interpolation. Based on minimizing computational complexity, it is concluded that a (low density) spectral SSD strain estimator coupled with parabolic-based subsample estimation is the preferred choice for spectral elastography.
AB - This paper compares the performance of various spectral shift estimators for use in spectral elastography, namely, the normalized cross-correlation (NCC), sum squared difference (SSD) and sum absolute difference (SAD). Simulation and experimental results demonstrate that the spectral SSD-based elastographic method exhibits no marked difference in performance compared to the more computationally costly NCC-based approach, which has conventionally been the preferred estimator in spectral elastography. The spectral SAD-based strain estimator, despite being computationally less burdening, failed to exhibit performance comparable to that of the NCC- and SSD-based techniques. Furthermore, though spectral subsample estimation techniques using a cosine-fit interpolation method outperformed that of the parabolic-fit method in terms of both reduced bias errors and standard deviations, the latter was analyzed in this study due to computational simplicity. The role of spectral density was evaluated without and with parabolic-based subsample interpolation. Based on minimizing computational complexity, it is concluded that a (low density) spectral SSD strain estimator coupled with parabolic-based subsample estimation is the preferred choice for spectral elastography.
KW - Elasticity imaging
KW - Spectral elastography
KW - Strain Filter
KW - Subsample estimation
KW - Ultrasound imaging
UR - http://www.scopus.com/inward/record.url?scp=29244433732&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=29244433732&partnerID=8YFLogxK
U2 - 10.1016/j.ultras.2005.08.006
DO - 10.1016/j.ultras.2005.08.006
M3 - Article
C2 - 16243373
AN - SCOPUS:29244433732
SN - 0041-624X
VL - 44
SP - 99
EP - 108
JO - Ultrasonics
JF - Ultrasonics
IS - 1
ER -