Oxygen metabolism in ischemic stroke using magnetic resonance imaging

Area of Science:

• Neuroimaging
• Cerebrovascular Diseases
• Biomedical Engineering

Background:

• Identifying the ischemic penumbra is crucial for stroke treatment beyond the narrow window for tissue plasminogen activator.
• Magnetic resonance blood oxygenation level-dependent (BOLD) contrast offers insights into tissue oxygen metabolism.
• BOLD-based methods are being explored for their utility in ischemic stroke assessment.

Purpose of the Study:

• To review BOLD-based imaging methods for assessing cerebral oxygenation changes in ischemic stroke.
• To introduce susceptibility-weighted imaging, R2 BOLD, R2*, R2 oun, MR_OEF, and MR_OMI approaches.
• To discuss the pathophysiological basis, BOLD contrast principles, and applications of these methods in stroke.

Main Methods:

• Review of existing literature on BOLD-based imaging techniques for ischemic stroke.
• Discussion of susceptibility-weighted imaging, R2 BOLD, R2*, R2 oun, MR_OEF, and MR_OMI.
• Analysis of the advantages and disadvantages of each BOLD-based method.

Main Results:

• BOLD-based methods provide a means to assess cerebral oxygenation changes induced by ischemia.
• Various BOLD approaches, including susceptibility-weighted imaging and R2/R2* methods, are detailed.
• Each method's strengths and limitations in the context of ischemic stroke are presented.

Conclusions:

• BOLD-based methods demonstrate significant potential for imaging oxygenation in ischemic brain tissue.
• Further technical refinement and validation against independent methods like positron emission tomography are recommended.
• These imaging techniques could improve patient selection for advanced stroke therapies.