Chapter

Cardiovascular Computed Tomography and Magnetic Resonance Imaging

Thomas C. Gerber and Eric M. Walser

in Mayo Clinic Cardiology

Fourth edition

Published on behalf of © Mayo Foundation for Medical Education and Research

Published in print November 2012 | ISBN: 9780199915712
Published online May 2013 | e-ISBN: 9780199322824 | DOI: http://dx.doi.org/10.1093/med/9780199915712.003.0257

Series: Mayo Clinic Scientific Press

Cardiovascular Computed Tomography and Magnetic Resonance Imaging

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Image formation in clinical CT relies on the mathematical conversion of projection data that have been obtained by measuring the attenuation of a fan-shaped x-ray beam from many angles around the patient. Image formation in clinical MRI relies on the alignment of hydrogen nuclei or protons along an external magnetic field. CT examinations are faster and easier to perform than MRI examinations and, therefore, are more widely offered. CT scans result in a 3-dimensional dataset that can be reformatted in any arbitrary plane after the examination is complete. Most cardiovascular MRI examinations consist of many image acquisitions, and experience is needed to obtain the desired views. Recent technical developments in CT and MRI have facilitated vascular imaging because an entire scan can now be completed during the transit time of one intravenous bolus administration of contrast material. The newer, 64-slice CT scanners and the newer pulse sequences for MRI have essentially replaced diagnostic angiography for large and medium-sized vessels.

Chapter.  6434 words.  Illustrated.

Subjects: Cardiovascular Medicine

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