This textbook addresses the classical use of Transcranial Doppler (TCD) and Transcranial Color-Coded Duplex Sonography (TCCS), focusing on the usefulness of neurological monitoring beyond classical acute brain injuries present in the daily intensive care medical practice. It encompasses a wide range of critical pathologies where neurological impact is part of clinical evolution, offering practical approaches for managing, application and interpretation of neurosonology to assist the physician to making real-time individualized decisions at bedside. It is an academic guide developed and edited by international experts being a very useful resource in daily practice for intensivists, neurologists, neurosurgeons and other specialists involving in critical care.