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Diffusion-weighted imaging in acute stroke--a tool of uncertain value?
Jens Fiehler1, Jochen B Fiebach, Achim Gass
1Department of Neuroradiology, University Hospitals of Hamburg-Eppendorf, Hamburg, Germany. fiehler@uke.uni-hamburg.de
Cerebrovascular Diseases (Basel, Switzerland)
|October 31, 2002
Summary
Diffusion-weighted MRI (DWI) may overestimate infarct core in acute stroke. Mild or temporary hypoperfusion can allow diffusion slowing to normalize, impacting
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- The established concept of 'tissue at risk of infarction' in acute stroke relies on diffusion-weighted MRI (DWI) lesion volume.
- This concept assumes that diffusion slowing on DWI indicates irreversible tissue damage.
Purpose of the Study:
- To re-evaluate the interpretation of DWI findings in acute stroke.
- To propose a revised approach for interpreting lesion development in DWI within clinical MRI protocols, considering experimental and clinical data.
Main Methods:
- Interpretation of experimental and clinical data on diffusion slowing and hypoperfusion.
- Analysis of time-course lesion development in DWI.
Main Results:
- Recent studies indicate that diffusion slowing in DWI may not always represent irreversible damage.
- Moderate or transient hypoperfusion can lead to normalization of diffusion-slowing tissue.
Conclusions:
- The assumption that diffusion slowing equals irreversible damage needs reconsideration.
- A nuanced interpretation of DWI lesion evolution is crucial for accurately defining infarct core and penumbra in acute stroke imaging.