Block regional interpolation scheme for k-space (BRISK): a rapid cardiac imaging technique

• Published in: Magnetic resonance in medicine Vol. 33; no. 2; p. 163
• Main Authors: Doyle, M, Walsh, E G, Blackwell, G G, Pohost, G M
• Format: Journal Article
• Language: English
• Published: United States 01.02.1995
• Subjects: Aortic Valve Insufficiency - diagnosis; Aortic Valve Stenosis - diagnosis; Echo-Planar Imaging - methods; Echo-Planar Imaging - statistics & numerical data; Feasibility Studies; Fourier Analysis; Heart - anatomy & histology; Heart Diseases - diagnosis; Humans; Image Enhancement - methods; Magnetic Resonance Imaging - methods; Magnetic Resonance Imaging - statistics & numerical data; Models, Statistical; Time Factors
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910330204

We introduce an acquisition method, "block regional interpolation scheme for k-space" (BRISK), to reduce the acquisition time for cardiac imaging. The method exploits the high degree of correlation that exists between time-resolved cardiac images. For representative k-space data sets, Fourier analysis was applied along the cardiac phase dimension to reveal that different regions of k-space can be effectively sampled at different rates. A reduced sampling strategy was implemented, and unsampled points were generated by Fourier interpolation. Time savings of up to 75% are quite feasible and 25% BRISK scans compare well with 100% scans. Simulations and acquisitions using a normal volunteer and patients are presented.