Acoustic radiation force (ARF) creep imaging applies step ARF excitation to induce creep displacement of soft tissue, and the corresponding time-dependent responses are used to estimate soft tissue viscoelasticity or its contrast. Single degree of freedom (SDF) and homogeneous analytical models have been used to characterize soft tissue viscoelasticity in ARF creep imaging. The purpose of this study is to investigate the fundamental limitations of the commonly used SDF and homogeneous assumptions in ARF creep imaging. In this paper, finite element (FE) models are developed to simulate the dynamic behavior of viscoelastic soft tissue subjected to step ARF. Both homogeneous and heterogeneous models are studied with different soft tissue viscoelasticity and ARF configurations. The results indicate that the SDF model can provide good estimations for homogeneous soft tissue with high viscosity, but exhibits poor performance for low viscosity soft tissue. In addition, a smaller focal region of the ARF is desirable to reduce the estimation error with the SDF models. For heterogeneous media, the responses of the focal region are highly affected by the local heterogeneity, which results in deterioration of the effectiveness of the SDF and homogeneous simplifications.
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September 2014
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Dynamic Simulation of Viscoelastic Soft Tissue in Acoustic Radiation Force Creep Imaging
Xiaodong Zhao,
Xiaodong Zhao
Department of Mechanical and Aerospace Engineering,
Piscataway, NJ 08854-8058
e-mail: xiaodong.zhao@rutgers.edu
Rutgers, the State University of New Jersey
,98 Brett Road
,Piscataway, NJ 08854-8058
e-mail: xiaodong.zhao@rutgers.edu
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Assimina A. Pelegri
Assimina A. Pelegri
1
Fellow ASME
Department of Mechanical and Aerospace Engineering,
Piscataway, NJ 08854-8058
e-mail: pelegri@jove.rutgers.edu
Department of Mechanical and Aerospace Engineering,
Rutgers, the State University of New Jersey
,98 Brett Road
,Piscataway, NJ 08854-8058
e-mail: pelegri@jove.rutgers.edu
1Corresponding author.
Search for other works by this author on:
Xiaodong Zhao
Department of Mechanical and Aerospace Engineering,
Piscataway, NJ 08854-8058
e-mail: xiaodong.zhao@rutgers.edu
Rutgers, the State University of New Jersey
,98 Brett Road
,Piscataway, NJ 08854-8058
e-mail: xiaodong.zhao@rutgers.edu
Assimina A. Pelegri
Fellow ASME
Department of Mechanical and Aerospace Engineering,
Piscataway, NJ 08854-8058
e-mail: pelegri@jove.rutgers.edu
Department of Mechanical and Aerospace Engineering,
Rutgers, the State University of New Jersey
,98 Brett Road
,Piscataway, NJ 08854-8058
e-mail: pelegri@jove.rutgers.edu
1Corresponding author.
Manuscript received October 28, 2013; final manuscript received June 20, 2014; accepted manuscript posted July 1, 2014; published online July 15, 2014. Assoc. Editor: Jeffrey Ruberti.
J Biomech Eng. Sep 2014, 136(9): 094502 (7 pages)
Published Online: July 15, 2014
Article history
Received:
October 28, 2013
Revision Received:
June 20, 2014
Accepted:
July 1, 2014
Citation
Zhao, X., and Pelegri, A. A. (July 15, 2014). "Dynamic Simulation of Viscoelastic Soft Tissue in Acoustic Radiation Force Creep Imaging." ASME. J Biomech Eng. September 2014; 136(9): 094502. https://doi.org/10.1115/1.4027934
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