Cerebral oxygen extraction fraction MRI: Techniques and applications

Area of Science:

• Neuroscience
• Medical Imaging
• Physiology

Background:

• The brain's high oxygen demand makes oxygen extraction fraction (OEF) a critical physiological parameter.
• OEF is a potential biomarker for various neurological diseases.
• Measuring OEF is essential for understanding brain metabolism and function.

Purpose of the Study:

• To review emerging magnetic resonance imaging (MRI)-based techniques for measuring OEF in the human brain.
• To compare MRI OEF methods with the established 15O PET "gold standard".
• To discuss the applications of MRI OEF techniques in health and disease.

Main Methods:

• Review of MRI techniques utilizing blood T2, phase, magnetic susceptibility, deoxyhemoglobin effects, and BOLD signal calibration.
• Comparison of MRI methods with 15O PET, highlighting advantages like non-invasiveness and lack of radiation.
• Analysis of signal mechanisms, acquisition protocols, and data processing for different MRI OEF techniques.

Main Results:

• Several MRI-based methods for OEF measurement have been developed, offering alternatives to 15O PET.
• MRI techniques provide non-invasive, radiation-free, and more accessible OEF assessments.
• These techniques are based on diverse physical principles related to blood oxygenation and magnetic properties.

Conclusions:

• MRI-based OEF measurement techniques are advancing rapidly.
• These non-invasive methods show significant promise as biomarkers for brain diseases.
• Further research and validation are ongoing for clinical applications of MRI OEF.