Written by two pioneers in the field, this book offers the first practical and complete introduction to the basic principles of photoacoustic imaging in biomedicine. It covers basic tissue optics, radio frequency properties, physics of ultrasound in tissue, photoacoustics theory, photo acoustic computed tomography, and photoacoustic scanning tomography with ultrasonic resolution. Capturing the state of the art in photoacoustic imaging for biomedical applications, each chapter presents discussions of current imaging systems, spatial resolutions, and limitations of each approach.