High-speed multislice T1 mapping using inversion-recovery echo-planar imaging

Tissue contrast in MR images is a strong function of spin‐lattice (T1) and spin‐spin (T2) relaxation times. However, the T1 relaxation time is rarely quantified because of the long scan time required to produce an accurate T1 map of the subject. In a standard 2D FT technique, this procedure may take up to 30 min. Modifications of the echo‐planar imaging (EPI) technique which incorporate the principle of inversion recovery (IR) enable multislice T1 maps to be produced in total scan times varying from a few seconds up to a minute. Using IR‐EPI, rapid quantification of T1 values may thus lead to better discrimination between tissue types in an acceptable scan time. © 1990 Academic Press, Inc.