An introductory text that explains how Doppler ultrasound works in simple step-by-step language. The book discusses the fundamental physical principles and instrumentation of Doppler ultrasound. It is the perfect primer for those preparing for registry or speciality board exams. The text reviews sonography and artifacts, blood flow in the vascular system, the Doppler effect, continuous-wave, pulsed wave, duplex and colour flow instruments, spectral analysis, and safety. Over 400 exercises throughout the chapters help check progress and understanding. The book includes a multiple choice practice examination, and contains a glossary of terms to aid understanding.