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Hypoperfusion and T1-hypointense lesions in white matter in multiple sclerosis

Ponnada A Narayana1, Yuxiang Zhou, Khader M Hasan

  • 1Department of Diagnostic and Interventional Imaging, Texas, USA.

Multiple Sclerosis (Houndmills, Basingstoke, England)
|July 10, 2013
PubMed
Abstract

Insights

Multiple sclerosis (MS) T1-hypointense lesions, indicating severe tissue damage, are linked to reduced cerebral blood flow (CBF). This study found these lesions predominantly occur in hypoperfused white matter regions in MS patients.

Area of Science:

  • Neuroimaging
  • Neurology
  • Medical Research

Background:

  • Longitudinal MRI reveals T1-hypointense lesions in multiple sclerosis (MS) indicating irreversible tissue damage.
  • The origin of persistent T1-hypointense lesions in MS remains unclear.

Purpose of the Study:

  • To investigate the association between brain hypoperfusion and the distribution of T1-hypointense lesions in MS.
  • To test the hypothesis that T1-hypointense lesions disproportionately occur in hypoperfused brain areas.

Main Methods:

  • Acquired MRI and cerebral blood flow (CBF) data from 45 MS patients and 20 healthy controls.
  • Generated CBF maps using pseudo-continuous arterial spin labeling.
  • Superimposed MS lesion probability distribution maps onto CBF maps.

Main Results:

  • Identified two distinct CBF clusters in white matter (WM) in both groups.
  • Observed reduced overall CBF in MS patients compared to controls.
  • Found T1-hypointense lesions concentrated in low-CBF WM regions, unlike T2-hyperintense lesions.

Conclusions:

  • Suggests a significant association between hypoperfusion and the development of T1-hypointense lesions in MS.
  • Highlights the role of reduced blood flow in severe, irreversible MS lesion formation.
Keywords:
Multiple sclerosisT1-hypointense lesionsT2-hyperintense lesionscerebral blood flowmagnetic resonance imaging

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