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Hemodynamic alterations in focal cerebral ischemia: temporal correlation analysis for functional imaging
E H Lo1, J Rogowska, K F Batchelder
1Center for Imaging and Pharmaceutical Research, Harvard Medical School, Charlestown, MA, USA.
Neurological Research
|April 1, 1996
Summary
This study introduces a new method using temporal correlation analysis of dynamic CT scans to map hemodynamic changes after focal cerebral ischemia. The technique identifies the hemodynamic penumbra, revealing altered blood flow in brain regions affected by stroke.
Area of Science:
- Neuroscience
- Medical Imaging
- Biomedical Engineering
Background:
- Focal cerebral ischemia, a major cause of stroke, leads to significant hemodynamic alterations.
- Accurate assessment of these hemodynamic changes is crucial for understanding stroke pathophysiology and guiding treatment.
Purpose of the Study:
- To develop and validate a novel approach for analyzing hemodynamic alterations following focal cerebral ischemia.
- To quantitatively map the hemodynamic penumbra using temporal correlation analysis of first-pass transit data.
Main Methods:
- Utilized dynamic CT scanning to measure first-pass transit of contrast agents.
- Employed temporal correlation analysis comparing pixel-wise transit profiles to normal reference profiles.
- Defined the hemodynamic penumbra based on statistical thresholds of normalized correlation coefficients.
Main Results:
- Demonstrated the ability to generate correlation maps visualizing regional hemodynamic alterations.
- Quantitatively identified the ischemic core and the hemodynamic penumbra in rabbit and rat models.
- Found penumbral zones exhibited approximately 40% reduced perfusion compared to contralateral hemispheres.
Conclusions:
- Temporal correlation analysis of first-pass transit profiles is an effective method for imaging the hemodynamic penumbra in focal cerebral ischemia.
- This technique provides quantitative insights into altered cerebral hemodynamics in stroke models.
- The findings support the potential clinical application of this method for stroke assessment.