Usefulness of high-b-value diffusion-weighted imaging in acute cerebral infarction

Area of Science:

• Radiology
• Neuroimaging
• Medical Imaging

Background:

• Acute cerebral infarction diagnosis relies on timely and accurate imaging.
• Diffusion-weighted (DW) magnetic resonance (MR) imaging is crucial for early stroke detection.
• Standard DW imaging uses lower b-values, potentially limiting lesion conspicuity.

Purpose of the Study:

• To evaluate the utility of high-b-value DW MR imaging in acute cerebral infarction.
• To determine if higher b-values improve the visualization and prediction of infarct extent.
• To compare high-b-value DW imaging with standard b=1,000 DW imaging.

Main Methods:

• 32 patients with acute cerebral infarction underwent DW MR imaging at b-values of 1,000, 2,000, and 3,000 s/mm(2).
• Imaging was performed 48 hours after stroke onset using a 1.5 T clinical imager.
• Lesion extent was compared between different b-values and final infarct size.

Main Results:

• The area of restricted diffusion became more distinct and extensive with increasing b-value in 19 of 32 patients.
• This effect was particularly noted in atherothrombotic-type cerebral infarction.
• The extent of infarction visualized on b=3,000 DWI and ADC maps closely matched the final infarct size in 12 of 15 patients.

Conclusions:

• High-b-value DW imaging offers superior identification of lesion extension in cerebral ischemia.
• Higher b-values enhance the conspicuity of restricted diffusion in acute stroke.
• The final infarct size and irreversible cytotoxic edema are more accurately predicted using high-b-value DWIs.