TY - GEN
T1 - Comparison of techniques for estimating shear-wave velocity in arterial wall using shear-wave elastography - FEM and phantom study
AU - Jang, Jun Keun
AU - Kondo, Kengo
AU - Namita, Takeshi
AU - Yamakawa, Makoto
AU - Shiina, Tsuyoshi
N1 - Funding Information:
ACKNOWLEDGMENT This work is partly supported by the Innovative Techno-Hub for integrated Medical Bio-imaging Project of the Special Coordination Funs for Promoting Science and Technology, Ministry of Education, Culture, Sport, Science and Technology (MEXT), Japan.
Publisher Copyright:
© 2015 IEEE.
PY - 2015/11/13
Y1 - 2015/11/13
N2 - Shear-wave elastography (SWE) enables noninvasive and quantitative evaluation of the mechanical properties of human soft tissue. Generally, shear wave velocity (CS) can be estimated using the time-of-flight method (TM). Young's modulus is then calculated directly from the estimated CS. However, because shear waves in thin-layered media (e.g., arterial walls) propagate as guided waves, CS cannot be accurately estimated using the general TM. To overcome this problem, the Lamb-theory-based method (LM) was recently proposed. In this study, we performed both experimental and finite-element (FE) analyses to evaluate the advantage of LM over TM. In FE analysis, we investigated why the general TM is ineffective for thin-layered media. In phantom experiments, CS results estimated using the two methods were compared for 1.5% and 2% agar plate and tube phantoms. The results indicated good agreement between LM (plate phantoms 5.0m/s for 1.5% agar and 7.2m/s for 2% agar; tube phantoms 5.3m/s for 1.5% agar and 7.3m/s for 2% agar) and SWE measurements (bulk phantoms 5.3m/s ± 0.27 for 1.5% agar and 7.3m/s ± 0.54 for 2% agar).
AB - Shear-wave elastography (SWE) enables noninvasive and quantitative evaluation of the mechanical properties of human soft tissue. Generally, shear wave velocity (CS) can be estimated using the time-of-flight method (TM). Young's modulus is then calculated directly from the estimated CS. However, because shear waves in thin-layered media (e.g., arterial walls) propagate as guided waves, CS cannot be accurately estimated using the general TM. To overcome this problem, the Lamb-theory-based method (LM) was recently proposed. In this study, we performed both experimental and finite-element (FE) analyses to evaluate the advantage of LM over TM. In FE analysis, we investigated why the general TM is ineffective for thin-layered media. In phantom experiments, CS results estimated using the two methods were compared for 1.5% and 2% agar plate and tube phantoms. The results indicated good agreement between LM (plate phantoms 5.0m/s for 1.5% agar and 7.2m/s for 2% agar; tube phantoms 5.3m/s for 1.5% agar and 7.3m/s for 2% agar) and SWE measurements (bulk phantoms 5.3m/s ± 0.27 for 1.5% agar and 7.3m/s ± 0.54 for 2% agar).
KW - Arterial stiffness
KW - Lamb-theory-based method
KW - Shear-wave elastography
KW - Time-of-flight method
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U2 - 10.1109/ULTSYM.2015.0288
DO - 10.1109/ULTSYM.2015.0288
M3 - Conference contribution
AN - SCOPUS:84962010478
T3 - 2015 IEEE International Ultrasonics Symposium, IUS 2015
BT - 2015 IEEE International Ultrasonics Symposium, IUS 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Ultrasonics Symposium, IUS 2015
Y2 - 21 October 2015 through 24 October 2015
ER -