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Separating function from structure in perfusion imaging of the aging brain.

Iris Asllani1, Christian Habeck, Ajna Borogovac

  • 1Program for Imaging and Cognitive Sciences in the Department of Radiology, Columbia University, New York, New York, USA. ia2026@columbia.edu

Human Brain Mapping
|January 28, 2009
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Summary
This summary is machine-generated.

Partial volume effects (PVE) in cerebral blood flow (CBF) imaging can overestimate age-related differences. This study corrected PVE in elderly individuals, revealing true CBF reductions and specific regional decreases in gray matter CBF.

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Area of Science:

  • Neuroimaging
  • Medical Physics
  • Gerontology

Background:

  • Cerebral blood flow (CBF) imaging accuracy is limited by partial volume effects (PVE) due to low spatial resolution.
  • PVE is particularly problematic in elderly individuals due to brain atrophy, potentially overestimating age-related CBF differences.
  • Distinguishing structural decline from true CBF reduction in the elderly is crucial for accurate neuroimaging analysis.

Purpose of the Study:

  • To develop and apply a PVE-correction algorithm to accurately assess age-related changes in cerebral blood flow (CBF).
  • To differentiate true CBF reductions from PVE-induced overestimations in elderly populations.
  • To investigate regional CBF differences between young and elderly individuals after PVE correction.

Main Methods:

  • Applied a partial volume effect (PVE) correction algorithm to continuous arterial spin labeling MRI (spin-echo EPI) data.
  • Acquired CBF images with a voxel size of 3.4 x 3.4 x 8 mm(3) in elderly (N=30) and young (N=26) cohorts.
  • Generated tissue-specific, PVE-independent CBF images for quantitative analysis.

Main Results:

  • PVE-corrected gray matter CBF was significantly lower in the elderly (88.2 mL/100 g/min) compared to the young (107.3 mL/100 g/min).
  • The frontal lobe showed the largest PVE contribution, increasing age-related CBF differences by 10% in men and 12% in women.
  • Voxelwise comparisons revealed widespread CBF decreases in specific brain regions in both elderly men and women.

Conclusions:

  • PVE correction is essential for accurate assessment of age-related cerebral blood flow changes, particularly in the elderly.
  • This method effectively separates structural decline from true CBF reduction, providing more reliable neuroimaging data.
  • Significant regional CBF reductions are evident in the elderly brain, highlighting the impact of aging on brain perfusion.