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Cardiac and respiratory double self‐gated cine MRI in the mouse at 7 T
Author(s) -
Hiba Bassem,
Richard Nathalie,
Janier Marc,
Croisille Pierre
Publication year - 2006
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.20815
Subject(s) - robustness (evolution) , gating , scanner , computer science , communication noise , magnetic resonance imaging , k space , signal (programming language) , artificial intelligence , medicine , chemistry , radiology , programming language , physiology , biochemistry , linguistics , philosophy , gene
ECG‐gated cardiac MRI in the mouse is hindered by many technical difficulties in ECG signal recording inside static and variable high magnetic scanner fields. The present study proposes an alternative robust method of acquiring auto‐gated cardiac and respiratory cine images in mouse heart. In our approach, a motion synchronization signal is extracted from the echo peak MR signal of a non‐triggered radial acquisition. This signal is then used for both cardiac and respiratory retrospective gating before cine image reconstruction. Highly asymmetric echoes were acquired to achieve the radial k ‐space sampling in order to avoid radial acquisition related artifacts and to increase auto‐gating robustness. In vivo experiments demonstrated the feasibility and robustness of self‐gated cine‐MRI in the mouse heart at 7T. The signal‐to‐noise and contrast‐to‐noise ratios of the self‐gated and ECG‐gated images were comparable, all parameters being equal. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.