Myocardial wall tagging with undersampled projection reconstruction

Azimuthally undersampled projection reconstruction (PR) acquisition is inve stigated for use in myocardial wall tagging with MR using grid tags to prov ide increased temporal and spatial resolution. PR can provide the high-reso lution images required for tagging with very few projections, at the expens e of artifact, Insight is provided into the PR undersampling artifact, in t he context of measuring myocardial motion with tags. For Fourier transform imaging, at least 112 phase-encodings must be collected to image tagging gr ids spaced 7 pixels apart. PR requires about 80 projections, a 1.4-fold red uction in scan time. Magn Reson Med 45:562-567, 2001, Published 2001 Wiley- Liss, Inc.dagger.