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The effect of high performance gradients on fast gradient echo imaging
Author(s) -
Reeder Scott B.,
McVeigh Elliot R.
Publication year - 1994
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.1910320510
Subject(s) - slew rate , gradient echo , waveform , nuclear magnetic resonance , bandwidth (computing) , physics , constant (computer programming) , materials science , optics , magnetic resonance imaging , computer science , telecommunications , voltage , medicine , quantum mechanics , radiology , programming language
The effect of gradient system performance on segmented k ‐space gradient echo imaging is presented. Three cases were investigated. First, an ideal system that has infinite slew rates and unlimited maximum gradient strengths was considered. Second, a “high speed” imaging system (2.3 ( G/cm ), 23 ( G/cm)/ms ) was considered. These two cases were compared with a “conventional” imaging system (1( G/cm ), 1.67 ( G/cm )/ ms ). It was found that substantial increases in SNR can be achieved (≈ 45%) by using high speed versus a conventional gradient system, for a TR of 6 ms. For trapezoidal gradient waveforms, there exists an optimum maximum gradient strength for a given slew rate, and any increase in gradient strength above this optimum will not be utilized by an optimized sequence. These studies have shown that increasing TR without decreasing the bandwidth is not a good way to increase SNR for constant scan time.