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In vivo time‐resolved quantitative motion mapping of the murine myocardium with phase contrast MRI
Author(s) -
Streif Jörg U.G.,
Herold Volker,
Szimtenings Michael,
Lanz Titus E.,
Nahrendorf Matthias,
Wiesmann Frank,
Rommel Eberhard,
Haase Axel
Publication year - 2003
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.10342
Subject(s) - in vivo , imaging phantom , nuclear magnetic resonance , magnetic resonance imaging , nuclear medicine , isoflurane , physics , contrast (vision) , temporal resolution , chemistry , biomedical engineering , medicine , optics , radiology , biology , microbiology and biotechnology , organic chemistry
Myocardial motion of healthy mice and mice with myocardial infarction was assessed in vivo by phase contrast (PC) cine MRI. The imaging module was a segmented fast low angle shot (FLASH) sequence with velocity compensation in all three gradient directions. To accomplish additional motion encoding, the spin phase was prepared using bipolar gradient pulses, which resulted in a linear dependence between the voxel velocity and spin phase. This method provided accurate quantification of the velocity magnitude and direction of the murine myocardium at a spatial resolution of 234 μm and a temporal resolution of about 10 ms. The acquisition was EKG‐gated and the mice were anesthetized by inhalation of 1.5–4.0 vol.% isoflurane at 1.5 l/min oxygen flow. To validate the MRI measurements, an experiment with a calibrated rotating phantom was performed. Deviations between MR velocity measurements and optical assessment by a light detector were lower than 1.6%. During our study, myocardial motion velocities between 0.4 cm/s and 1.7 cm/s were determined for the healthy murine myocardium across the heart cycle. Areas with myocardial infarction were clearly segmented and showed a motion velocity which was significantly reduced. In conclusion, the method is an accurate technique for the assessment of murine myocardial motion in vivo. Magn Reson Med 49:315–321, 2003. © 2003 Wiley‐Liss, Inc.