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The effect of a gadolinium-based contrast agent on diffusion tensor imaging.

Amir Zolal1, Martin Sameš, Martin Burian

  • 1Department of Neurosurgery, JE Purkynje University and Masaryk Hospital, Usti nad Labem, Czech Republic. amirzolal@gmail.com

European Journal of Radiology
|June 14, 2011
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Summary

Gadolinium contrast can artificially increase fractional anisotropy (FA) in diffusion tensor imaging (DTI) scans. This effect distorts diffusion measurements, particularly in brain tumors and surrounding tissues.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Biophysics

Background:

  • Diffusion Tensor Imaging (DTI) is crucial for analyzing white matter microstructure.
  • Gadolinium-based contrast agents are widely used in MRI but their effect on DTI metrics is not fully understood.
  • Conflicting results exist regarding gadolinium contrast's impact on DTI parameters.

Purpose of the Study:

  • To comprehensively evaluate the influence of gadolinium contrast agents on various DTI indices.
  • To investigate the extent of diffusion measurement distortion caused by contrast administration.
  • To analyze changes in normal-appearing white matter, peritumoral edema, and enhancing tumor regions.

Main Methods:

  • 16 patients with intra-axial contrast-enhancing brain tumors underwent DTI scans.
  • Scans were performed both before and after gadolinium contrast administration.
  • Multiple DTI indices, including fractional anisotropy (FA) and eigenvalues, were statistically compared between native and post-contrast scans.

Main Results:

  • Post-contrast DTI scans showed a significant increase in FA and a disproportionate decrease in eigenvalues.
  • Spherical index decreased, while linear and planar indices increased post-contrast.
  • All diagonal components of the diffusion tensor matrix significantly decreased, with the strongest effects in enhancing tumor areas.

Conclusions:

  • Gadolinium contrast administration can lead to artificially elevated FA values in DTI.
  • Disproportionate changes in eigenvalues contribute to diffusion measurement distortion.
  • These distortions affect not only contrast-enhancing regions but also surrounding tissues and normal white matter.