title: Extension of rapid phase-contrast magnetic resonance imaging using BRISK in multidirectional flow.
abstract: We developed BRISK-CON-VPS, a rapid phase-contrast cine approach that is a hybrid of the BRISK-VPS (Block Regional Interpolation Scheme for k-space) and conventional (CONV-VPS) scanning employing k-space views per segment (VPS). BRISK-CON-VPS allows data acquisition approximately four times faster than CONV-VPS imaging and has the advantage compared to BRISK-VPS that it can potentially be incorporated into real-time applications. In BRISK-CON-VPS contiguous regions of k-space are sampled using a views per segment factor that is varied as a function of distance from the k-space center. Computational fluid dynamics (CFD) data were used to simulate CONV-VPS, BRISK-VPS, and BRISK-CON-VPS. BRISK-CON-VPS was simulated by incrementing the VPS progressively with increasing distance from the k-space origin while BRISK-VPS was simulated using a uniform VPS applied to the sparse sampling scheme. Simulations showed that up to a base VPS of 5, both BRISK-CON-VPS and BRISK-VPS retained excellent axial-velocity accuracy. Secondary in-plane velocity flow fields were well represented with BRISK-CON-VPS and BRISK-VPS up to a base VPS of 3. CONV-VPS, BRISK-CON-VPS, and BRISK-VPS were applied in vivo and shown to provide comparable quantitative flow data. BRISK-CON-VPS accomplishes breath-hold acquisitions as efficiently as BRISK-VPS, but without requiring data interpolation or under-sampling k-space.
authors.affiliation: Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
authors.forename: Bradley L
authors.initials: BL
authors.lastname: Hershey
authors.forename: Mark
authors.initials: M
authors.lastname: Doyle
authors.forename: Eduardo
authors.initials: E
authors.lastname: Kortright
authors.forename: Rohan
authors.initials: R
authors.lastname: More
authors.forename: Geetha
authors.initials: G
authors.lastname: Rayarao
authors.forename: Andreas
authors.initials: A
authors.lastname: Anayiotos
mesh_terms: D000818:Animals; D003198:Computer Simulation; D003326:Coronary Circulation; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008955:Models, Cardiovascular; D011859:Radiography