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Improved arterial spin labeling after myocardial infarction in mice using cardiac and respiratory gated look‐locker imaging with fuzzy C‐means clustering
Author(s) -
Vandsburger Moriel H.,
Janiczek Robert L.,
Xu Yaqin,
French Brent A.,
Meyer Craig H.,
Kramer Christopher M.,
Epstein Frederick H.
Publication year - 2010
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.22280
Subject(s) - perfusion , myocardial infarction , medicine , cardiology , magnetic resonance imaging , infarction , perfusion scanning , arterial spin labeling , radiology
Experimental myocardial infarction (MI) in mice is an important disease model, in part due to the ability to study genetic manipulations. MRI has been used to assess cardiac structural and functional changes after MI in mice, but changes in myocardial perfusion after acute MI have not previously been examined. Arterial spin labeling noninvasively measures perfusion but is sensitive to respiratory motion and heart rate variability and is difficult to apply after acute MI in mice. To account for these factors, a cardiorespiratory‐gated arterial spin labeling sequence using a fuzzy C‐means algorithm to retrospectively reconstruct images was developed. Using this method, myocardial perfusion was measured in remote and infarcted regions at 1, 7, 14, and 28 days post‐MI. Baseline perfusion was 4.9 ± 0.5 mL/g·min and 1 day post‐MI decreased to 0.9 ± 0.8 mL/g·min in infarcted myocardium ( P < 0.05 versus baseline) while remaining at 5.2 ± 0.8 mL/g·min in remote myocardium. During the subsequent 28 days, perfusion in the remote zone remained unchanged, while a partial recovery of perfusion in the infarct zone was seen. This technique, when applied to genetically engineered mice, will allow for the investigation of the roles of specific genes in myocardial perfusion during infarct healing. Magn Reson Med 63:648–657, 2010. © 2010 Wiley‐Liss, Inc.