Premium
Phase‐contrast MR angiography with reduced acquisition time: New concepts in sequence design
Author(s) -
Hausmann Richard,
Lewin Jonathan S.,
Laub Gerhard
Publication year - 1991
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.1880010405
Subject(s) - computer science , contrast (vision) , subtraction , data set , phase contrast microscopy , maximum intensity projection , projection (relational algebra) , set (abstract data type) , flow (mathematics) , data acquisition , computer vision , artificial intelligence , algorithm , background subtraction , angiography , radiology , mathematics , optics , pixel , physics , medicine , geometry , arithmetic , programming language , operating system
A new acquisition scheme for three‐dimensional (3D) phase‐contrast MR angiography reduces by 33% the measurement time for a data set sensitive to flow in all three orthogonal directions. Background suppression is achieved by acquiring a flow‐compensated data set and three data sets flow encoded in the three orthogonal directions, with subsequent complex subtraction. The data are acquired in an interleaved fashion, eliminating misregistration artifacts due to patient motion between measurements sensitive to different flow directions. A standard maximum‐intensity‐projection algorithm is applied to the combined 3D data set to obtain angiographic projections sensitive to all three orthogonal flow directions. The theory and implementation of the method are described and examples of its application to the intracranial and abdominal circulation are provided.