Automatic 3D tracking of cardiac material markers using slice-following and harmonic-phase MRI.
A method to track a grid of cardiac material points in three dimensions using slice-following (SF) tagged magnetic resonance imaging (MRI) and harmonic-phase MRI is presented. A three-dimensional grid of material points on the lines of intersections of short-axis (SA) and long-axis (LA) planes is automatically tracked by combining two-dimensional pathlines that are computed on both SA and LA image planes. This process yields the true three-dimensional motion of points originating on the image plane intersections. Experimental data from normal volunteers, each obtained in four short breath-holds using the SF harmonic phase MRI pulse sequence, is presented. A validation of two-dimensional in-plane tracks using this pulse sequence on a moving phantom is also presented.
Sampath
Smita
S
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD 21218, USA. sampaths@mail.nih.gov
Prince
Jerry L
JL
D003971:Diastole / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009200:Myocardial Contraction / Q000502:physiology*; D019047:Phantoms, Imaging; D013599:Systole / Q000502:physiology; D016277:Ventricular Function, Left / Q000502:physiology*