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Related Experiment Videos

High-b-value diffusion-weighted MR imaging of suspected brain infarction.

J R Meyer1, A Gutierrez, B Mock

  • 1Department of Radiology, Northwestern University Medical School, Evanston, IL, USA.

AJNR. American Journal of Neuroradiology
|December 8, 2000
PubMed
Summary

High-b-value diffusion-weighted MRI improves detection of chronic brain infarction lesions. Combining b=1,000 with higher b-values (2,500 or 3,000) enhances tissue characterization in suspected stroke cases.

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Area of Science:

  • Radiology
  • Neuroimaging
  • Medical Physics

Background:

  • Advancements in MR instrumentation enable whole-brain diffusion-weighted imaging (DWI) with b values exceeding 1,000.
  • High b-values may enhance contrast and signal change detection in brain infarction.

Purpose of the Study:

  • To evaluate if high-b-value DWI improves contrast and detection of signal changes in acute and chronic brain infarction.
  • To compare lesion detection at b=1,000, b=2,500, and b=3,000.

Main Methods:

  • Prospective evaluation of 30 subjects with suspected brain infarction using a 1.5-T MRI scanner.
  • Acquisition of single-shot echo-planar DWI sequences at b=1,000, b=2,500, and b=3,000.
  • Comparison with fast fluid-attenuated inversion recovery (FLAIR) and fast spin-echo T2-weighted images.

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Main Results:

  • High-b-value DWI (b=2,500 and 3,000) increased contrast for all detected lesions.
  • The number of hypointense lesions increased significantly with higher b-values (19 at b=1,000 vs. 48 at b=2,500 and 55 at b=3,000).
  • High b-values improved visualization of chronic, subcortical ischemic lesions and lacunar infarcts.

Conclusions:

  • High-b-value DWI (b=2,500 or 3,000) did not impact the diagnosis of acute infarction.
  • Combining DWI at b=1,000 with higher b-values (b=2,500) improves tissue characterization by expanding the range of detectable abnormalities in patients with suspected brain infarction.