Premium
Tailored SMASH image reconstructions for robust in vivo parallel MR imaging
Author(s) -
Sodickson Daniel K.
Publication year - 2000
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/1522-2594(200008)44:2<243::aid-mrm11>3.0.co;2-l
Subject(s) - image quality , computer science , image resolution , oblique case , harmonics , electromagnetic coil , noise (video) , iterative reconstruction , artificial intelligence , sensitivity (control systems) , computer vision , image (mathematics) , physics , electronic engineering , philosophy , linguistics , quantum mechanics , voltage , engineering
The simultaneous acquisition of spatial harmonics (SMASH) imaging technique uses spatial information from an array of RF coils to substitute for omitted encoding gradient steps and thereby to accelerate MR image acquisition. Since SMASH image reconstructions rely on the accurate generation of sinusoidally varying composite sensitivity functions to emulate the spatial modulations produced by gradients, the technique was originally believed to be limited to certain image planes or coil array configurations which were particularly suited to the generation of spatial harmonics. Several key improvements to the SMASH reconstruction procedure are described, taking advantage of various degrees of freedom in the spatial harmonic fit. The use of tailored fitting procedures, in combination with a numerical conditioning approach based on new observations about noise propagation in the fit, are shown to allow high‐quality SMASH image reconstructions in oblique and double‐oblique image planes, both in phantoms and in high‐resolution cardiac MR images. Magn Reson Med 44:243–251, 2000. © 2000 Wiley‐Liss, Inc.