Spiral imaging on a small-bore system at 4.7T

Magn Reson Med. 1995 Oct;34(4):580-5. doi: 10.1002/mrm.1910340414.

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 inhomogeneity-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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adipose Tissue / anatomy & histology
  • Algorithms
  • Animals
  • Artifacts
  • Contrast Media
  • Equipment Design
  • Gadolinium
  • Gadolinium DTPA
  • Image Enhancement / instrumentation
  • Image Enhancement / methods*
  • Image Processing, Computer-Assisted / methods
  • Lipids
  • Magnetic Resonance Imaging / instrumentation
  • Magnetic Resonance Imaging / methods*
  • Models, Structural
  • Organometallic Compounds
  • Oscillometry
  • Pentetic Acid / analogs & derivatives
  • Rats
  • Signal Processing, Computer-Assisted
  • Water

Substances

  • Contrast Media
  • Lipids
  • Organometallic Compounds
  • Water
  • Pentetic Acid
  • Gadolinium
  • Gadolinium DTPA