title: Four-dimensional MR cardiovascular imaging: method and applications.
abstract: Magnetic resonance imaging (MRI) has long been recognized as a powerful tool for cardiovascular imaging because of its unique potential to measure blood flow, cardiac wall motion and tissue properties jointly. However, many clinical applications of cardiac MRI have been limited by low imaging speed. Three-dimensional cardiovascular MRI in real-time, or 4D cardiovascular MRI without cardiac and respiratory gating or triggering, remains an important technological goal of the MR cardiovascular research community. In this paper, we present a novel technique to achieve 4D cardiovascular MR imaging in unprecedented spatiotemporal resolution. This breakthrough is made possible through a creative use of sparse sampling theory and parallel imaging with phased array coils and a novel implementation of data acquisition and image reconstruction. We have successfully used the technique to perform 4D cardiovascular imaging on rats, achieving 0.65 mm × 0.65 mm × 0.31 mm spatial resolution with a frame rate of 67 fps. This capability enables simultaneous imaging of cardiac motion, respiratory motion, and first-pass myocardial perfusion. This in turn allows multiple cardiac assessments including measurement of ejection fraction, cardiac output, and myocardial blood flow in a single experiment. We believe that the proposed technique can open up many important applications of cardiovascular imaging and have significant impact on the field.
authors.affiliation: Department of Electrical and Computer Engineering and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 1406 West Green Street, Urbana, IL 61801, USA. christo8@illinois.edu
authors.forename: Anthony G
authors.initials: AG
authors.lastname: Christodoulou
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.forename: Haosen
authors.initials: H
authors.lastname: Zhang
authors.forename: Chien
authors.initials: C
authors.lastname: Ho
authors.forename: Zhi-Pei
authors.initials: ZP
authors.lastname: Liang
mesh_terms: D000818:Animals; D002319:Cardiovascular System / Q000033:anatomy & histology*; D008279:Magnetic Resonance Imaging / Q000379:methods*