Functional magnetic resonance imaging in chronic ischaemic stroke

Area of Science:

• Neuroscience
• Medical Imaging
• Stroke Research

Background:

• Ischaemic stroke is a major cause of adult disability globally.
• Understanding long-term injury mechanisms is crucial for effective stroke rehabilitation.
• Blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) has potential for non-invasive brain function assessment but faces interpretation challenges in chronic stroke.

Purpose of the Study:

• To review the current applications of BOLD fMRI in chronic ischaemic stroke progression.
• To discuss methods for enhancing information gained from BOLD fMRI measurements.
• To highlight the need for preclinical research to develop quantitative models for BOLD fMRI interpretation in stroke.

Main Methods:

• Review of current literature on BOLD fMRI in chronic stroke.
• Summary of preclinical studies measuring vascular reactivity, neuronal activity, and metabolism.
• Analysis of post-ischaemic evolution in neuronal, glial, and vascular functions.

Main Results:

• BOLD fMRI application in chronic stroke research is currently limited due to complex physiological effects.
• Preclinical models provide insights into neuronal, glial, and vascular changes post-stroke.
• Interpreting BOLD fMRI signals requires understanding the interplay of physiological parameters affected by stroke.

Conclusions:

• Realizing BOLD fMRI's potential in stroke research depends on robust preclinical studies.
• Developing an ischaemia-specific quantitative model of BOLD signal contrast is essential.
• This model will provide a framework for interpreting fMRI findings in clinical stroke populations, aiding treatment development.