High-resolution imaging of murine myocardial infarction with delayed-enhancement cine micro-CT
- 1 June 2007
- journal article
- research article
- Published by American Physiological Society in American Journal of Physiology-Heart and Circulatory Physiology
- Vol. 292 (6), H3172-H3178
- https://doi.org/10.1152/ajpheart.01307.2006
Abstract
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.Keywords
This publication has 30 references indexed in Scilit:
- Acute volume overload elevates T-wave alternans magnitudeJournal of Applied Physiology, 2007
- Differentiation of Recent and Chronic Myocardial Infarction by Cardiac Computed TomographyThe American Journal of Cardiology, 2006
- Multimodal functional cardiac MRI in creatine kinase-deficient mice reveals subtle abnormalities in myocardial perfusion and mechanicsAmerican Journal of Physiology-Heart and Circulatory Physiology, 2006
- Factor XIII Deficiency Causes Cardiac Rupture, Impairs Wound Healing, and Aggravates Cardiac Remodeling in Mice With Myocardial InfarctionCirculation, 2006
- Characterization of Acute and Chronic Myocardial Infarcts by Multidetector Computed TomographyCirculation, 2006
- Contrast-Enhanced Multidetector Computed Tomography Viability Imaging After Myocardial InfarctionCirculation, 2006
- Noninvasive Targeted Imaging of Matrix Metalloproteinase Activation in a Murine Model of Postinfarction RemodelingCirculation, 2005
- Magnetic resonance imaging of cardiomyocyte apoptosis with a novel magneto‐optical nanoparticleMagnetic Resonance in Medicine, 2005
- Fundamental image quality limits for microcomputed tomography in small animalsMedical Physics, 2003
- Practical cone-beam algorithmJournal of the Optical Society of America A, 1984