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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
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.
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.
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.