TY - GEN
T1 - Shear wave Dispersion Ultrasound Vibrometry (SDUV) on an ultrasound system:In vivo measurement of liver viscoelasticity in healthy animals
AU - Xie, Hua
AU - Shamdasani, Vijay
AU - Fernandez, Anna T.
AU - Peterson, Roy
AU - Lachman, Mike
AU - Shi, Yan
AU - Robert, Jean Luc
AU - Urban, Matthew
AU - Chen, Shigao
AU - Greenleaf, James
PY - 2010
Y1 - 2010
N2 - Shear wave Dispersion Ultrasound Vibrometry (SDUV), is an acousticradiation force based technique that measures tissue shear viscoelasticity bycharacterizing shear wave speed dispersion. One of the potential applications ofthis technique is the non-invasive measurement of liver viscoelasticity tostage liver fibrosis. In this study, a Philips' iU22 ultrasound system wasmodified to allow for the same transducer to generate and track propagatingshear waves. The pulse sequence was implemented on a C5-1 curvilineartransducer, with RF data acquisition and off-line processing. Liver scans ofthree healthy pigs were conducted under in vivo and ex vivo conditions. In vivodata were captured during inspiration or expiration of the breathing cycle withbreath hold. Shear modulus and viscosity were estimated in a 4 x 4 mm2 area close to the pushing focus. For pig #3, the in vivomeasurement revealed a shear modulus μ1 = 2.64 ± 0.48 kPa and a shearviscosity μ2 = 1.09 ± 0.30 Pa•s. The ex vivomeasurement made directly on the exposed liver after euthanasia resulted inμ1 = 2.63 ± 0.39 kPa and μ2 = 0.98 ±0.18 Pa•s. For pigs #1 and #2, the in vivo results are μ1 =2.41 ± 0.65 kPa, μ2 = 2.01 ± 1.00 Pa•s; andμ1 = 1.74 ± 0.56 kPa, μ2 = 1.25 ± 0.87Pa•s. Their corresponding ex vivo results are μ1 = 2.87± 0.32 kPa, μ2 = 1.06 ± 0.18 Pa•s; andμ1 = 1.84 ± 0.33 kPa, μ2 = 0.77 ± 0.15Pa•s, respectively. Higher variance in in vivo measurements of pigs #1 and2 may be attributed to phase aberration as these two animals had thickerabdominal fat and muscle layers than pig #3. To study phase aberration effects,SDUV measurements were made subsequently on the ex vivo liver under differentconditions: from intact to sequentially removing the overlying tissue layersuntil exposing liver. Results from this study demonstrate the feasibility ofconducting SDUV measurement using an ultrasound system and a single transducer.The reconstructed viscoelasticity for normal porcine liver agrees well with thevalues reported in the literature. Further in vivo evaluation in animals andhumans is required to validate these results.
AB - Shear wave Dispersion Ultrasound Vibrometry (SDUV), is an acousticradiation force based technique that measures tissue shear viscoelasticity bycharacterizing shear wave speed dispersion. One of the potential applications ofthis technique is the non-invasive measurement of liver viscoelasticity tostage liver fibrosis. In this study, a Philips' iU22 ultrasound system wasmodified to allow for the same transducer to generate and track propagatingshear waves. The pulse sequence was implemented on a C5-1 curvilineartransducer, with RF data acquisition and off-line processing. Liver scans ofthree healthy pigs were conducted under in vivo and ex vivo conditions. In vivodata were captured during inspiration or expiration of the breathing cycle withbreath hold. Shear modulus and viscosity were estimated in a 4 x 4 mm2 area close to the pushing focus. For pig #3, the in vivomeasurement revealed a shear modulus μ1 = 2.64 ± 0.48 kPa and a shearviscosity μ2 = 1.09 ± 0.30 Pa•s. The ex vivomeasurement made directly on the exposed liver after euthanasia resulted inμ1 = 2.63 ± 0.39 kPa and μ2 = 0.98 ±0.18 Pa•s. For pigs #1 and #2, the in vivo results are μ1 =2.41 ± 0.65 kPa, μ2 = 2.01 ± 1.00 Pa•s; andμ1 = 1.74 ± 0.56 kPa, μ2 = 1.25 ± 0.87Pa•s. Their corresponding ex vivo results are μ1 = 2.87± 0.32 kPa, μ2 = 1.06 ± 0.18 Pa•s; andμ1 = 1.84 ± 0.33 kPa, μ2 = 0.77 ± 0.15Pa•s, respectively. Higher variance in in vivo measurements of pigs #1 and2 may be attributed to phase aberration as these two animals had thickerabdominal fat and muscle layers than pig #3. To study phase aberration effects,SDUV measurements were made subsequently on the ex vivo liver under differentconditions: from intact to sequentially removing the overlying tissue layersuntil exposing liver. Results from this study demonstrate the feasibility ofconducting SDUV measurement using an ultrasound system and a single transducer.The reconstructed viscoelasticity for normal porcine liver agrees well with thevalues reported in the literature. Further in vivo evaluation in animals andhumans is required to validate these results.
KW - SDUV
KW - Shear wave ultrasound dispersion vibrometry
KW - liver fibrosis staging
KW - phase aberration
KW - shear modulus
KW - shear viscosity
KW - shearwave speed
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U2 - 10.1109/ULTSYM.2010.5935956
DO - 10.1109/ULTSYM.2010.5935956
M3 - Conference contribution
AN - SCOPUS:80054081087
SN - 9781457703829
T3 - Proceedings - IEEE Ultrasonics Symposium
SP - 912
EP - 915
BT - 2010 IEEE International Ultrasonics Symposium, IUS 2010
T2 - 2010 IEEE International Ultrasonics Symposium, IUS 2010
Y2 - 11 October 2010 through 14 October 2010
ER -