Restriction Spectrum Imaging

**Semantic type:** Diagnostic Procedure

**Definition:** A diffusion-weighted MRI technique that utilizes data obtained from multiple b-values and diffusion directions to measure diffusion orientation and length scale; it has been used to identify distinct microscopic tissues based on water diffusion behavior.

**Synonyms:** - RSI - RSI-MRI - Restriction Spectrum MRI - Restriction Spectrum Magnetic Resonance Imaging