Native myocardial longitudinal (T1 ) relaxation time: Regional, age, and sex associations in the healthy adult heart.

Purpose: To use magnetic resonance imaging (MRI) at two field strengths to assess healthy adults' regional myocardial noncontrast (native) T1 relaxation time distribution, and global myocardial native T1 between sexes and across age groups.

Materials And Methods: In all, 84 healthy volunteers underwent MRI at 1.5T and 3.