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Image artifacts due to a time-varying contrast medium concentration in 3D contrast-enhanced MRA

Author:
  • Jonas Svensson
  • J Stefan Petersson
  • Freddy Ståhlberg
  • Elna-Marie Larsson
  • Peter Leander
  • Lars E Olsson
Publishing year: 1999
Language: English
Pages: 919-928
Publication/Series: Journal of Magnetic Resonance Imaging
Volume: 10
Issue: 6
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

The purpose of this work was to study image effects due to time-varying contrast medium concentration in contrast-enhanced three dimensional (3D) magnetic resonance angiography (MRA) images. Two different simulation models (1D and 3D) and two different contrast medium variation schemes were used. Phantom measurements were also performed. Experiments were performed for several different bolus timings. Similar sequence and image object parameters were used in both simulations and measurements (TE/TR 2. 1/7.8 mses, flip angle 30 degrees, T1/T2 1200-80/150-40 msec, flow velocity 100 cm/sec). A small variation in bolus timing yielded large variations in the appearance of the image effects, especially if the center of k-space was sampled in the vicinity of rapid contrast medium concentration variation. For a typical bolus injection in a patient, a severe signal loss but only minor ringing and edge artifacts appeared if the bolus injection was poorly timed. Effects of pulsatile flow were minor. The 3D model proved to be a useful tool in these studies.

Keywords

  • Radiology, Nuclear Medicine and Medical Imaging
  • contrast medium
  • angiography
  • magnetic resonance
  • artifacts
  • simulations

Other

Published
  • Medical Radiation Physics, Malmö
  • Radiology Diagnostics, Malmö
  • ISSN: 1522-2586
Freddy Ståhlberg
E-mail: freddy [dot] stahlberg [at] med [dot] lu [dot] se

Professor

Medical Radiation Physics, Lund

+46 46 17 31 19

+46 70 688 31 19

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Professor

Diagnostic Radiology, (Lund)

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Project manager

MR Physics

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