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Titolo:
RADIAL ECHO-PLANAR IMAGING
Autore:
SILVA AC; BARBIER EL; LOWE IJ; KORETSKY AP;
Indirizzi:
CARNEGIE MELLON UNIV,PITTSBURGH NMR CTR BIOMED RES PITTSBURGH PA 15213 CARNEGIE MELLON UNIV,DEPT BIOL SCI PITTSBURGH PA 15213 UNIV PITTSBURGH,DEPT PHYS & ASTRON PITTSBURGH PA 15260
Titolo Testata:
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
fascicolo: 1, volume: 135, anno: 1998,
pagine: 242 - 247
SICI:
1090-7807(1998)135:1<242:>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEREBRAL BLOOD-FLOW; CHEMICAL-SHIFT; FUNCTIONAL MRI; PROJECTION RECONSTRUCTION; HUMAN BRAIN; NMR; LIMITATIONS; RESOLUTION; REDUCTION; IMAGES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
A.C. Silva et al., "RADIAL ECHO-PLANAR IMAGING", Journal of magnetic resonance (San Diego, Calif. 1997 : Print), 135(1), 1998, pp. 242-247

Abstract

A new ultrafast magnetic resonance imaging pulse sequence named radial echo-planar imaging (rEPI) is introduced. The sequence is based on amodification of the echo-planar imaging (EPI) sequence to scan k-space radially, in an attempt to combine the speed of EPI with the benefits of radial sampling. Like in EPI, all the desired lines in k-space are scanned consecutively in opposite directions. The unique feature of this new sequence, however, is that the orientation of the readout gradient is incrementally rotated, so that all the echoes are refocused through the center of k-space. Therefore, rEPI data are acquired in a polar grid, and image reconstruction can be done either by means of filtered back-projection or by regridding the data to a Cartesian matrix followed by 2D Fourier transform. First results show that rEPI images can be acquired with the same speed and signal-to-noise ratio of EPI images. rEPI images are also shown to be less sensitive to off-resonance effects than EPI images. Further studies are underway to investigatethe usefulness of rEPI for spectroscopic imaging and applications affected by motion. (C) 1998 Academic Press.

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Documento generato il 24/11/20 alle ore 12:22:09