Abstract
Magnetic resonance imaging (MRI) has become increasingly accessible in cardiovascular medicine and, in many respects, is considered the non-invasive gold standard for the anatomical, functional and histological assessment of the heart and vessels. In particular, specific sequences and protocols have been developed to investigate in depth almost all ischaemic, nonischaemic, valvular, vascular and congenital heart diseases, and are grouped under the term of cardiovascular magnetic resonance (CMR). The principle of MRI relies on the excitation and interaction between the hydrogen nuclei of biological tissues with three different magnetic fields (static, gradient and radiofrequency) applied in a specific temporal sequence during the scan. Many different sequences can be run using diverse parameters, each designed for a specific purpose: cine gradient-echo and cine steady-state free precession sequences allow anatomical and functional assessment of cardiac chambers; fast spin-echo sequences allow tissue characterization with different T1, T2 and proton-density weighting, in order to differentiate tissues according to their biochemical composition; post-contrast first-pass sequences permit to visualize and quantify myocardial perfusion; post-contrast late enhancement sequences are designed to assess the presence, extent and distribution of scar within the myocardium. Recently, native T1 mapping, T2/T2* mapping and extracellular volume mapping have been introduced as quantitative tools, further improving the diagnostic and prognostic usefulness of CMR. The recognized clinical value and complexity of the provided information impose CMR as a fundamental diagnostic tool in cardiology, after first-level examinations, including clinical, biohumoral, electrocardiography and echocardiography, have been applied. This introductory chapter will provide a brief overview of the physics of MRI, the most common CMR sequences, their clinical applications and the most important limitations and contraindications of a CMR exam.
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Barison, A., Martini, N., Dellegrottaglie, S., Pontone, G. (2023). Introduction to Cardiac MRI. In: Barison, A., Dellegrottaglie, S., Pontone, G., Indolfi, C. (eds) Case-based Atlas of Cardiovascular Magnetic Resonance. Springer, Cham. https://doi.org/10.1007/978-3-031-32593-9_1
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