Acoustics and imaging systems; acoustic wave propagation, refraction, reflection, and scattering. Rayleigh equation; transient and steady-state radiation characteristics of simple structures. Modeling, design, and characterization of transmitting and receiving transducers, including micromachined ultrasound transducers. Imaging systems; accounting for the stochastic nature of ultrasound images, image quality metrics. Selected topics may include nonlinear acoustics, Doppler estimation of blood flow, photoacoustic imaging, and medical applications.