This ultrasound physics category is specifically designed for ARDMS SPI exam preparation. The question bank covers wave propagation, frequency, resolution, Doppler physics, artifacts, bioeffects, and safety regulations. Questions are structured to improve conceptual understanding, formula application, and exam-oriented reasoning. The content reflects the most tested SPI topics and current ultrasound physics standards used in U.S. certification exams. This category is essential for passing the SPI exam and achieving ARDMS certification, providing a solid physics foundation for safe and effective sonography practice.