TY - GEN
T1 - Effects of phase aberration on acoustic radiation force-based shear wave generation
AU - Amador, Carolina
AU - Aristizabal, Sara
AU - Greenleaf, James F.
AU - Urban, Matthew W.
PY - 2013
Y1 - 2013
N2 - Tissue elasticity is measured by shear wave elasticity imaging methods using acoustic radiation force to create the shear waves. Reliable tissue elasticity measurements are achieved with strong shear waves. Phase aberration and tissue attenuation can hamper the generation of shear waves for in vivo applications. In this study we explored how phase aberration affects ultrasound focusing for creating shear waves and evaluate the resulting shear wave amplitude and the shear wave velocity. A Verasonics ultrasound system equipped with a linear, a curved linear, and a phased array transducer (L7-4, C4-2 and P4-2) was used. An excised piece of swine belly tissue consisted of the skin, subcutaneous fat, and muscle were placed on top of the elastic phantom to evaluate the shear wave produced when transmitting through the different layers. The ultrasound frequency used for three transducers was varied to evaluate the resulting shear waves with the different tissue layers. Analysis of shear wave production with real tissue layers showed that large fat layers and combinations of skin, fat, and muscle defocused the ultrasound beam most, thereby decreasing the shear wave amplitudes.
AB - Tissue elasticity is measured by shear wave elasticity imaging methods using acoustic radiation force to create the shear waves. Reliable tissue elasticity measurements are achieved with strong shear waves. Phase aberration and tissue attenuation can hamper the generation of shear waves for in vivo applications. In this study we explored how phase aberration affects ultrasound focusing for creating shear waves and evaluate the resulting shear wave amplitude and the shear wave velocity. A Verasonics ultrasound system equipped with a linear, a curved linear, and a phased array transducer (L7-4, C4-2 and P4-2) was used. An excised piece of swine belly tissue consisted of the skin, subcutaneous fat, and muscle were placed on top of the elastic phantom to evaluate the shear wave produced when transmitting through the different layers. The ultrasound frequency used for three transducers was varied to evaluate the resulting shear waves with the different tissue layers. Analysis of shear wave production with real tissue layers showed that large fat layers and combinations of skin, fat, and muscle defocused the ultrasound beam most, thereby decreasing the shear wave amplitudes.
KW - Elasticity
KW - Phase aberration
KW - Shear wave
UR - http://www.scopus.com/inward/record.url?scp=84894354860&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894354860&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2013.0090
DO - 10.1109/ULTSYM.2013.0090
M3 - Conference contribution
AN - SCOPUS:84894354860
SN - 9781467356862
T3 - IEEE International Ultrasonics Symposium, IUS
SP - 348
EP - 351
BT - 2013 IEEE International Ultrasonics Symposium, IUS 2013
T2 - 2013 IEEE International Ultrasonics Symposium, IUS 2013
Y2 - 21 July 2013 through 25 July 2013
ER -