Evaluating the Feasibility of Nondiffractive Bessel Beams for Shear Wave Elasticity Imaging: A Simulation Study

Shear wave elasticity imaging (SWEI) has been developed to characterize the elasticity of tissue that B-mode imaging cannot. However, focused push beam has its limitation of short focal zone due to the diffraction of the wave. To improve the depth of push beam, we proposed a non-diffractive Bessel push beam induced shear wave method and used it in SWEI. In this work, a simulation study presents the superiorities of Bessel push beam over focused push beam. From the results, Bessel beam shows a larger beam depth than focused beam. Also, Bessel push beam improves the accuracy and contrast of shear wave speed images of homogeneous digital phantom. In addition, this work presents scaling factor of Bessel beam is the main parameter affecting the beam depth.