Comparison of cerebral oxygen extraction fraction using ASE and TRUST methods in patients with sickle cell disease and healthy controls

Slim Fellah, Chunwei Ying, Yan Wang, Kristin P. Guilliams, Melanie E. Fields, Yasheng Chen, Josiah Lewis, Amy Mirro, Rachel Cohen, Nkemdilim Igwe, Cihat Eldeniz, Dengrong Jiang, Hanzhang Lu, William J. Powers, Jin Moo Lee, Andria L. Ford, Hongyu An

Research output: Contribution to journalArticlepeer-review

Abstract

Abnormal oxygen extraction fraction (OEF), a putative biomarker of cerebral metabolic stress, may indicate compromised oxygen delivery and ischemic vulnerability in patients with sickle cell disease (SCD). Elevated OEF was observed at the tissue level across the brain using an asymmetric spin echo (ASE) MR method, while variable global OEFs were found from the superior sagittal sinus (SSS) using a T2-relaxation-under-spin-tagging (TRUST) MRI method with different calibration models. In this study, we aimed to compare the average ASE-OEF in the SSS drainage territory and TRUST-OEF in the SSS from the same SCD patients and healthy controls. 74 participants (SCD: N = 49; controls: N = 25) underwent brain MRI. TRUST-OEF was quantified using the Lu-bovine, Bush-HbA and Li-Bush-HbS models. ASE-OEF and TRUST-OEF were significantly associated in healthy controls after controlling for hematocrit using the Lu-bovine or the Bush-HbA model. However, no association was found between ASE-OEF and TRUST-OEF in patients with SCD using either the Bush-HbA or the Li-Bush-HbS model. Plausible explanations include a discordance between spatially volume-averaged oxygenation brain tissue and flow-weighted volume-averaged oxygenation in SSS or sub-optimal calibration in SCD. Further work is needed to refine and validate non-invasive MR OEF measurements in SCD.

Original languageEnglish
JournalJournal of Cerebral Blood Flow and Metabolism
DOIs
StateAccepted/In press - 2024

Keywords

  • Asymmetric spin echo
  • T2-relaxation-under-spin-tagging
  • magnetic resonance imaging
  • oxygen extraction fraction
  • sickle cell disease

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