Oxygen extraction fraction mapping based combining quantitative susceptibility mapping and quantitative blood oxygenation level-dependent imaging model using multi-delay PCASL

• Published in: Brain research Vol. 1846; p. 149259
• Main Authors: Liu, Xiaoyi, Yin, Yayan, Shan, Yi, Chao, Wang, Li, Jingkai, Zhang, Yue, Li, Qiongge, Liu, Jing, Lu, Jie
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-01-2025
• Subjects: Arterial spin labeling; Cerebral blood volume; Multi-delay ASL; Oxygen extraction fraction; Oxygen metabolism; Multi-delay ASL; qBOLD; ATT; Oxygen metabolism; CBF; Oxygen extraction fraction; PLD; QSM; cCBF; OEF; CBV; Arterial spin labeling; vCBV; Cerebral blood volume; ASL; aCBV
• ISSN: 0006-8993; 1872-6240; 1872-6240
• DOI: 10.1016/j.brainres.2024.149259

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•Estimate OEF based on QSM + qBOLD with the multi-delay ASL method.•The OEF estimate using single and multi-delay ASL shows significant differences.•The OEF was modified by the method used to set initial venous CBV.•The initial value of venous CBV is significant inverse with the corresponding OEF.
The oxygen extraction fraction is an essential biomarker for the assessment of brain metabolism. A recently proposed method combined with quantitative susceptibility mapping and quantitative blood oxygen level-dependent magnitude enables noninvasive mapping of the oxygen extraction fraction. Our study investigated the oxygen extraction fraction mapping variations of single-delay and multi-delay arterial spin-labeling.
A total of twenty healthy participants were enrolled. The multi-echo spoiled gradient-echo, multi-delay arterial spin-labeling, and magnetization-prepared rapid gradient echo sequences were acquired at 3.0 T. The mean oxygen extraction fraction was generated under a single delay time of 1780 ms, multi-delay arterial spin-labeling of transit-corrected cerebral blood flow, and multi-delay arterial spin-labeling of arterial cerebral blood volume. The results were compared via paired t tests and the Wilcoxon test. Linear regression analyses were used to investigate the relationships among the oxygen extraction fraction, cerebral blood flow, and venous cerebral blood volume.
The oxygen extraction fraction estimate with multi-delay arterial spin-labeling yielded a significantly lower value than that with single-delay arterial spin-labeling. The average values for the whole brain under single-delay arterial spin-labeling, multi-delay arterial spin-labeling of transit-corrected cerebral blood flow, and multi-delay arterial spin-labeling of arterial cerebral blood volume were 41.5 ± 1.7 % (P < 0.05), 41.3 ± 1.9 % (P < 0.001), and 40.9 ± 1.9 % (N = 20), respectively. The oxygen extraction fraction also showed a significant inverse correlation with the venous cerebral blood volume under steady-state conditions when multi-delay arterial spin-labeling was used (r = 0.5834, p = 0.0069).
These findings suggest that the oxygen extraction fraction is significantly impacted by the arterial spin-labeling methods used in the quantitative susceptibility mapping plus the quantitative blood oxygen level-dependent model, indicating that the differences should be accounted for when employing oxygen extraction fraction mapping based on this model in diseases.