Immature brain: spin-echo pulse sequence parameters for high-contrast MR imaging.

Abstract
Appropriate spin-echo (SE) pulse sequence parameters generate magnetic resonance (MR) images wtih very high gray matter/white matter contrast in neonates and young infants. In these young patients, long SE sequences with a repetition time of 3,000-3,500 msec and multiple echoes with the longest echo time of 120-160 msec are employed to yield high-contrast images. A high-contrast MR image of a 1-month-old infant is presented.