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High-resolution imaging of murine myocardial infarction with delayed-enhancement cine micro-CT

¹Center for Molecular Imaging Research, Massachusetts General Hospital, Boston, Massachusetts; ²Center for In Vivo Microscopy, Duke Medical Center, Durham, North Carolina; and ³Cardiology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts

Submitted 29 November 2006 ; accepted in final form 17 February 2007

The objective of this study was to determine the feasibility of delayed-enhancement micro-computed tomography (µCT) imaging to quantify myocardial infarct size in experimental mouse models. A total of 20 mice were imaged 5 or 35 days after surgical ligation of the left coronary artery or sham surgery (n = 6 or 7 per group). We utilized a prototype µCT that covers a three-dimensional (3D) volume with an isotropic spatial resolution of 100 µm. A series of image acquisitions were started after a 200 µl bolus of a high-molecular-weight blood pool CT agent to outline the ventricles. CT imaging was continuously performed over 60 min, while an intravenous constant infusion with iopamidol 370 was started at a dosage of 1 ml/h. Thirty minutes after the initiation of this infusion, signal intensity in Hounsfield units was significantly higher in the infarct than in the remote, uninjured myocardium. Cardiac morphology and motion were visualized with excellent contrast and in fine detail. In vivo CT determination of infarct size at the midventricular level was in good agreement with ex vivo staining with triphenyltetrazolium chloride [5 days post-myocardial infarction (MI): r² = 0.86, P < 0.01; 35 days post-MI: r² = 0.92, P < 0.01]. In addition, we detected significant left ventricular remodeling consisting of left ventricular dilation and decreased ejection fraction. 3D cine µCT reliably and rapidly quantifies infarct size and assesses murine anatomy and physiology after coronary ligation, despite the small size and fast movement of the mouse heart. This efficient imaging tool is a valuable addition to the current phenotyping armamentarium and will allow rapid testing of novel drugs and cell-based interventions in murine models.

remodeling; computed tomography

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