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Related Experiment Videos

Contrast agents in functional MR imaging

A G Sorensen1, A L Tievsky, L Ostergaard

  • 1Massachusetts General Hospital Nuclear Magnetic Resonance Center, Department of Radiology, Massachusetts General Hospital, Charlestown, USA.

Journal of Magnetic Resonance Imaging : JMRI
|January 1, 1997
PubMed
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Contrast agents enhance functional MRI (fMRI) for assessing cerebral hemodynamics like perfusion imaging. This technique aids in identifying the ischemic penumbra and evaluating intraaxial tumors, improving diagnostic accuracy.

Area of Science:

  • Radiology
  • Neuroimaging
  • Medical Physics

Background:

  • Functional MRI (fMRI) utilizes contrast agents to assess physiological parameters.
  • While activation mapping often omits contrast, cerebral hemodynamic mapping, such as perfusion imaging, benefits significantly from their use.

Purpose of the Study:

  • To explore the utility of contrast-enhanced fMRI for cerebral hemodynamics and intraaxial tumor assessment.
  • To detail the methods and potential clinical applications of perfusion imaging in neuro-oncology.

Main Methods:

  • Serial echo planar images acquired post-bolus injection of lanthanide chelates.
  • Application of susceptibility contrast physics and tracer kinetic principles for generating relative cerebral blood volume maps.
  • Utilizing diffusion and perfusion pulse sequences to identify the ischemic penumbra.

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Main Results:

  • Generation of relative cerebral blood volume maps is feasible.
  • Deconvolution allows for estimation of cerebral blood flow and mean transit time within technical limits.
  • Functional MRI perfusion imaging demonstrates sensitivity to neovascularity in intraaxial tumors, offering improved image quality over PET.

Conclusions:

  • Contrast-enhanced fMRI is valuable for cerebral hemodynamic assessment and intraaxial tumor evaluation.
  • Clinical applications include guiding biopsy site selection and monitoring post-irradiation effects.
  • Advancements in data analysis and map generation promise enhanced diagnostic accuracy and utility.