The effect of high performance gradients on fast gradient echo imaging

S. B. Reeder, E. R. McVeigh

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)612-621
Number of pages10
JournalMagnetic Resonance in Medicine
Volume32
Issue number5
DOIs
StatePublished - 1994

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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