This volume aims to provide a working knowledge of the principles and techniques of functional imaging. It should equip radiologists with the necessary background to fully understand the diagnostic capabilities of functional imaging and incorporate these techniques into clinical practice. Coverage encompasses magnetic resonance imaging and spectroscopy, positron emission tomography, single photon emission computed tomography, Doppler ultrasound, electroencephalography and magnetoencephalography. The first part of the work explains key concepts common to all functional imaging modalities, such as basic principles of image formation, use of contrast agents and radiopharmaceuticals, principles of quantitative function analysis and physiological modelling, and digital image processing for functional analysis. Subsequent chapters focus on the use of various imaging technologies for evaluation of physical function - gamma rays (nuclear medicine), X-rays, optical methods, radio waves (magnetic resonance), electroencephalography, magnetoencephalography and sound waves.