Premium
Retrospective reconstruction of cardiac cine images from golden‐ratio radial MRI using one‐dimensional navigators
Author(s) -
Krämer Martin,
Herrmann KarlHeinz,
Biermann Judith,
Reichenbach Jurgen R.
Publication year - 2014
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.24364
Subject(s) - artifact (error) , image quality , medicine , cardiac imaging , signal to noise ratio (imaging) , contrast to noise ratio , cardiac cycle , data acquisition , real time mri , nuclear medicine , artificial intelligence , magnetic resonance imaging , computer science , physics , radiology , cardiology , image (mathematics) , optics , operating system
Purpose To demonstrate radial golden‐ratio–based cardiac cine imaging by using interspersed one‐dimensional (1D) navigators. Materials and Methods The 1D navigators were interspersed into the acquisition of radial spokes which were continuously rotated by an angle increment based on the golden‐ratio. Performing correlation analysis between the 1D navigator projections, time points corresponding to the same cardiac motion phases were automatically identified and used to combine retrospectively golden‐ratio rotated radial spokes from multiple data windows. Data windows were shifted consecutively for dynamic reconstruction of different cardiac motion frames. Experiments were performed during a single breathhold. By artificially reducing the amount of input data, signal‐to‐noise ratio (SNR) and contrast‐to‐noise ratio (CNR) as well as artifact level was evaluated for different breathhold durations. Results Analysis of the 1D navigator data provided a detailed correlation function revealing cardiac motion over time. Imaging results were comparable to images reconstructed based on a timely synchronized ECG. Cardiac cine images with a low artifact level and good image quality in terms of SNR and CNR were reconstructed from volunteer data achieving a CNR between the myocardium and the left ventricular cavity of 50 for the longest breathhold duration of 26 s. CNR maintained a value higher than 30 for acquisition times as low as 10 s. Conclusion Combining radial golden‐ratio–based imaging with an intrinsic navigator is a promising and robust method for performing high quality cardiac cine imaging. J. Magn. Reson. Imaging 2014;40:413–422 . © 2013 Wiley Periodicals, Inc .