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High-resolution diffusion imaging using phase-corrected segmented echo-planar imaging

Author:
  • Sara Brockstedt
  • J R Moore
  • C Thomsen
  • Stig Holtås
  • Freddy Ståhlberg
Publishing year: 2000
Language: English
Pages: 649-657
Publication/Series: Magnetic Resonance Imaging
Volume: 18
Issue: 6
Document type: Journal article
Publisher: Elsevier

Abstract english

Diffusion magnetic resonance imaging (MRI) was performed with a high-resolution segmented echo-planar imaging technique, which provided images with substantially less susceptibility artifacts than images obtained with single-shot echo-planar imaging (EPI). Diffusion imaging performed with any multishot pulse sequence is inherently sensitive to motion artifacts and in order to reduce motion artifacts, the presented method utilizes navigator echo phase corrections, performed after a one-dimensional Fourier transform along the frequency-encoding direction. Navigator echo phases were fitted to a straight line prior to phase correction to avoid errors from internal motion. In vivo imaging was performed using electro cardiographic (ECG) triggering. Apparent diffusion coefficient (ADC) maps were calculated on a pixel-by-pixel basis using up to seven diffusion sensitivities, ranging from b = 0 to 1129 x 10(6) s/m(2).

Keywords

  • Radiology, Nuclear Medicine and Medical Imaging
  • Phase corrections
  • High resolution
  • Diffusion imaging
  • Segmented EPI
  • Ischemic stroke

Other

Published
  • ISSN: 1873-5894
Freddy Ståhlberg
E-mail: freddy.stahlberg [at] med.lu.se

Professor

Medical Radiation Physics, Lund

+46 46 17 31 19

+46 70 688 31 19

32

Professor

Diagnostic Radiology, (Lund)

+46 46 17 70 30

32