Acoustic nonlinear parameter tomography of biological tissues in reflection mode

摘要

Acoustic nonlinear parameter B/A describes the nonlinear features of the finite amplitude sound wave propagation in a medium. Compared with the linear parameters (such as sound velocity, attenuation coefficient etc.), this parameter provides more information about the structure of the tissues. Therefore, the acoustic nonlinear parameter B/A may be a novel parameter for the ultrasound tissue characterization. In this paper, the nonlinear parameter B/A computed tomography in reflection mode is proposed by using a compound transducer. Theoretical analysis and experimental image of biological tissues, including porcine liver and hepatocirrhosis tissues are presented.