Fast myocardial T mapping in mice using k-space weighted image contrast and a Bloch simulation-optimized radial sampling pattern.

Purpose: T dispersion quantification can potentially be used as a cardiac magnetic resonance index for sensitive detection of myocardial fibrosis without the need of contrast agents. However, dispersion quantification is still a major challenge, because T mapping for different spin lock amplitudes is a very time consuming process. This study aims to develop a fast and accurate T mapping sequence, which paves the way to cardiac T dispersion quantification within the limited measurement time of an in vivo study in small animals.

Balanced spin-lock preparation for B -insensitive and B -insensitive quantification of the rotating frame relaxation time T.

Purpose: Accurate and artifact-free T quantification is still a major challenge due to a susceptibility of the spin-locking module to B and/or B field inhomogeneities. In this study, we present a novel spin-lock preparation module (B-SL) that enables an almost full compensation of both types of inhomogeneities.

Methods: The new B-SL module contains a second 180° refocusing pulse to compensate each pulse in the preparation block by a corresponding pulse with opposite phase.