T1-Weighted Magnetic Resonance Imaging

**Semantic type:** Diagnostic Procedure

**Definition:** A method of magnetic resonance imaging (MRI) that creates contrast between tissues based on differences in the longitudinal relaxation of a tissue's net magnetization vector; it measures the time taken for spinning protons to realign with the external magnetic field. This MRI sequence is produced by using short time to echo (TE) and repetition times (TR).

**Synonyms:** - Spin-lattice Relaxation MRI - T1-Weighted MRI - T1W MRI - T1WI