Reproducibility of myocardial T₁ and T₂ relaxation time measurement using slice‐interleaved T₁ and T₂ mapping sequences

Abstract

Slice-interleaved T and T mapping sequences yield highly reproducible T and T measurements with >80% of interpretable myocardial segments. J. Magn. Reson. Imaging 2016;44:1159-1167.

Nonrigid active shape model–based registration framework for motion correction of cardiac T1 mapping

“…The increased number of motion‐corrupted segments at apical slices is primarily caused by the increased myocardial motions at the LV apex and degraded myocardial contrast caused by partial‐volume artifacts. We also noticed an increased average number of motion‐corrupted segments for both corrected and uncorrected maps at LV inferior wall in all slices—basal, midcavity, and apical—as previously reported .…”

“…Myocardial interstitial diffuse fibrosis and extra‐cellular volume expansion are characteristic of many cardiac diseases and alter longitudinal relaxation time (T 1 ) values . Recent improvements in pulse‐sequence development allow reproducible measurement of myocardial T 1 values . In myocardial T 1 mapping, a series of T 1 ‐weighted (T 1 ‐w) images are acquired with different saturation or inversion times (TIs) and are used to create T 1 maps by voxel‐wise fitting through two‐ or three‐parameter fit models .…”

Automated analysis of cardiovascular magnetic resonance myocardial native T1 mapping images using fully convolutional neural networks

“…However, both techniques still require post-processing motion correction [12–14]. Numerous semi-automatic techniques are available to compensate this respiratory motion [12–14], however these methods are not effective in all patients [15].…”

Increased myocardial native T1 relaxation time in patients with nonischemic dilated cardiomyopathy with complex ventricular arrhythmia

“…12,13 This is an important observation that warrants further evaluation. There are many sources in variability that could contribute to this overlap, including pulse sequence 34,35 and natural differences among different patients even within the same group. The latter variability is an important one that has clinical implications.…”