Papers Published

1. McAleavey, S.A. and Nightingale, K.R. and Stutz, D.L. and Hsu, S.J. and Trahey, G.E., Image reconstruction with acoustic radiation force induced shear waves, Proc. SPIE - Int. Soc. Opt. Eng. (USA), vol. 5035 (2003), pp. 223 - 34 [12.480275] .
   (last updated on 2007/04/13)

   Abstract:
   Acoustic radiation force may be used to induce localized displacements within tissue. This phenomenon is used in acoustic radiation force impulse imaging (ARFI), where short bursts of ultrasound deliver an impulsive force to a small region. The application of this transient force launches shear waves which propagate normally to the ultrasound beam axis. Measurements of the displacements induced by the propagating shear wave allow reconstruction of the local shear modulus, by wave tracking and inversion techniques. Here we present in vitro, ex vivo and in vivo measurements and images of shear modulus. Data were obtained with a single transducer, a conventional ultrasound scanner and specialized pulse sequences. Young's modulus values of 4 kPa, 13 kPa and 14 kPa were observed for fat, breast fibroadenoma, and skin. Shear modulus anisotropy in beef muscle was observed

   Keywords:
   biological effects of acoustic radiation;biomechanics;biomedical ultrasonics;image reconstruction;medical image processing;muscle;shear modulus;skin;Young's modulus;