This course introduces the fundamental physical principles and instrumentation of diagnostic ultrasound, including wave propagation, acoustic interactions, transducer design, imaging methods, beamforming, and Doppler flow measurements. The course examines the advantages and limitations of ultrasound relative to other imaging modalities and highlights both conventional and emerging technologies such as elastography, coded excitation, and acoustic radiation force imaging. Students will gain exposure to clinical applications, high-frequency and intracavity imaging, and safety considerations.