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Cerebral microbleeds: burden assessment by using quantitative susceptibility mapping.

Tian Liu1, Krishna Surapaneni, Min Lou

  • 1Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA.

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Summary

Quantitative susceptibility mapping (QSM) offers consistent measurement of cerebral microbleed burden, unlike standard MRI sequences. QSM

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Area of Science:

  • Neuroimaging
  • Radiology
  • Medical Physics

Background:

  • Cerebral microbleeds are common in stroke patients and can be detected using MRI.
  • Standard MRI sequences show inconsistent measurements of microbleed burden.
  • Quantitative susceptibility mapping (QSM) is an emerging MRI technique.

Purpose of the Study:

  • To evaluate QSM's ability to reduce inconsistency in cerebral microbleed burden measurements.
  • To compare QSM with standard MRI sequences (T2*-weighted, SWI, R2*) in measuring microbleeds.

Main Methods:

  • Retrospective analysis of 10 stroke patients with cerebral microbleeds.
  • Acquisition of multiecho gradient-echo MRI at 3.0 T.
  • Measurement of microbleed size and total susceptibility using QSM and standard sequences across varying echo times.

Main Results:

  • Microbleed volume measurements increased significantly with echo time for T2*-weighted, SWI, and R2* images (P < .01).
  • QSM measurements of microbleed volume also increased with echo time (P < .01).
  • Total susceptibility measured by QSM remained consistent across echo times (P = .31) and showed significantly less variation than volume measurements (P < .01).

Conclusions:

  • The total susceptibility of cerebral microbleeds, as measured by QSM, is an echo time-independent physical property.
  • QSM provides a more stable and reliable method for quantifying cerebral microbleed burden compared to standard MRI sequences.