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Diffusion and perfusion MR imaging in acute ischemic stroke: a comparison to SPECT
J O Karonen1, L Ostergaard, P Vainio
1Department of Radiology, Kuopio University Hospital, Kuopio, Finland.
Computer Methods and Programs in Biomedicine
|May 30, 2001
Summary
Diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) can detect stroke. Combined DWI and PWI accurately predict infarct growth in acute ischemic stroke patients within one week.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) are advanced MRI techniques for acute stroke assessment.
- These methods can differentiate infarcted tissue (DWI) from hypoperfused, salvageable tissue (PWI).
Purpose of the Study:
- To evaluate the effectiveness of combined DWI and PWI in assessing acute ischemic stroke hemodynamics.
- To determine if these imaging techniques can predict infarct growth over one week.
Main Methods:
- Forty-six acute stroke patients underwent DWI and PWI within 24 hours of stroke onset, with follow-up imaging at 2 days and 1 week.
- Twenty-three patients also had SPECT scans during the acute phase for comparison.
- Analysis focused on volumes of infarcted and hypoperfused tissue and the perfusion-diffusion mismatch.
Main Results:
- On day one, hypoperfused tissue volume was significantly larger than infarcted tissue volume (P<0.001).
- Initial hypoperfusion volume significantly correlated with final infarct size (P<0.001).
- The perfusion-diffusion mismatch significantly predicted infarct growth (P<0.001), and PWI and SPECT hypoperfusion volumes correlated well (P<0.001).
Conclusions:
- Combined DWI and PWI is a powerful tool for evaluating acute ischemic stroke hemodynamics.
- This imaging approach can reliably predict infarct growth within a week.
- The findings support the clinical utility of DWI and PWI in acute stroke management.