Accurate, localized quantification of white matter perfusion with single-voxel ASL

Magn Reson Med. 2010 Oct;64(4):1109-13. doi: 10.1002/mrm.22476.

Abstract

Quantification of perfusion in white matter is still difficult due to its low level, causing an often insufficiently low signal-to-noise ratio, and its long and inhomogeneous transit delays. Here, a technique is presented that accurately measures white matter perfusion by combining a spectroscopic single-voxel localization technique (point-resolved spectroscopy) with a pulsed arterial spin labeling encoding scheme (flow-sensitive alternating inversion recovery) to specifically address the properties of white matter. The transit delay was measured by shifting the position of a slice-selective saturation pulse between inversion and acquisition. Perfusion measurements resulted in values of 15.6 ± 3.2 mL/100 g/min in the left and 15.2 ± 4.8 mL/100 g/min in the right hemispheric white matter and 83.2 ± 15.2 mL/100 g/min in cortical gray matter. Taking dispersion of the transit times into account does not cause a significant change in the measured values.

MeSH terms

  • Algorithms*
  • Blood Flow Velocity / physiology
  • Brain / blood supply
  • Brain / cytology
  • Brain / physiology*
  • Female
  • Humans
  • Image Enhancement / methods
  • Image Interpretation, Computer-Assisted / methods*
  • Imaging, Three-Dimensional / methods*
  • Magnetic Resonance Angiography / methods*
  • Male
  • Nerve Fibers, Myelinated / physiology*
  • Nerve Fibers, Myelinated / ultrastructure
  • Reproducibility of Results
  • Sensitivity and Specificity