Premium
Spiral imaging on a small‐bore system at 4.7t
Author(s) -
Spielman Daniel M.,
Pauly John M.
Publication year - 1995
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/mrm.1910340414
Subject(s) - spiral (railway) , waveform , imaging phantom , amplifier , computer science , ultrashort pulse , physics , residual , iterative reconstruction , nuclear magnetic resonance , optics , voltage , artificial intelligence , algorithm , bandwidth (computing) , mathematics , telecommunications , quantum mechanics , mathematical analysis , laser
Spiral imaging has a number of advantages for ultrafast data acquisition. However, implementation on high‐field small‐bore systems requires carefully addressing the issues of in‐homogeneity‐induced blurring and gradient hardware constraints. In this paper, spiral imaging on a 40‐cm‐bore 4.7T CSI Omega System (Bruker Instruments) is discussed. A constant‐voltage gradient waveform design algorithm is developed to reduce readout times as well as minimize waveform distortions due to gradient amplifier nonlinearities. Residual errors are then measured and taken into account in the image reconstruction procedure. Multiple spiral interleaves as well as a multifrequency reconstruction algorithm are used to decrease blurring of off‐resonance spins. Both phantom and in vivo images demonstrate the performance of the resulting pulse sequences.