Constructive Interference in Steady State: A MRI imaging technique that produces high-resolution images. CISS accentuates the contrast between fluids, such as cerebrospinal fluid (CSF), and surrounding structures. This enables precise visualization of intricate structures within the nervous system, including the brain, spinal cord, and inner ear. Its ability to provide heavily T2-weighted images sets it apart as a valuable tool for detailing soft tissues and distinguishing fine structures.