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Overlapping section coverage in multisection imaging
Author(s) -
Hennig Jürgen
Publication year - 1993
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.1880030219
Subject(s) - position (finance) , echo planar imaging , encoding (memory) , computer science , volume (thermodynamics) , phase (matter) , echo (communications protocol) , fourier transform , planar , computer vision , artificial intelligence , optics , magnetic resonance imaging , physics , computer graphics (images) , radiology , medicine , computer network , finance , quantum mechanics , economics
A method is proposed in which the section position for two‐dimensional Fourier transform multisection imaging is advanced from one phase‐encoding step to the next, so that information is sampled continuously over the total volume under observation. This “ramp scan”technique allows reconstruction of images from any arbitrary position within the sampled volume. The imaging properties depend strongly on the order of distribution of phase‐encoding steps to the different section positions. In practice, images are reconstructed at each nominal position of a multisection experiment, plus at each position halfway between sections. The volume under study is thus represented by overlapping sections. The gaps between sections that arise in conventional multisection imaging‐even with optimized pulse shapes‐are thus avoided. This approach is applicable not only to conventional spin‐echo imaging but to other techniques such as RARE (rapid acquisition with relaxation enhancement) and gradient‐echo and echo‐planar imaging.