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Spiral imaging on a small-bore system at 4.7t

✍ Scribed by Daniel M. Spielman; John M. Pauly

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
1017 KB
Volume
34
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

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.

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