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Quantification of myocardial oxygen extraction fraction: A proof‐of‐concept study
Author(s) -
Lu Lillian,
Eldeniz Cihat,
An Hongyu,
Li Ran,
Yang Yang,
Schindler Thomas H.,
Peterson Linda R.,
Woodard Pamela K.,
Zheng Jie
Publication year - 2021
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.28673
Subject(s) - reproducibility , coefficient of variation , magnetic resonance imaging , medicine , cardiology , nuclear medicine , isometric exercise , blood volume , radiology , chemistry , chromatography
Purpose To demonstrate a proof of concept for the measurement of myocardial oxygen extraction fraction (mOEF) by a cardiovascular magnetic resonance technique. Methods The mOEF measurement was performed using an electrocardiogram‐triggered double‐echo asymmetric spin‐echo sequence with EPI readout. Seven healthy volunteers (22‐37 years old, 5 females) were recruited and underwent the same imaging scans at rest on 2 different days for reproducibility assessment. Another 5 subjects (23‐37 years old, 4 females) underwent cardiovascular magnetic resonance studies at rest and during a handgrip isometric exercise with a 25% of maximal voluntary contraction. Both mOEF and myocardial blood volume values were obtained in septal regions from respective maps. Results The reproducibility was excellent for the measurements of mOEF in septal myocardium (coefficient of variation: 3.37%) and moderate for myocardial blood volume (coefficient of variation: 19.7%). The average mOEF and myocardial blood volume of 7 subjects at rest were 0.61 ± 0.05 and 11.0 ± 4.3%, respectively. The mOEF agreed well with literature values that were measured by PET in healthy volunteers. In the exercise study, there was no significant change in mOEF (0.61 ± 0.06 vs 0.62 ± 0.07) or myocardial blood volume (12 ± 6% vs 13 ± 4%) from rest to exercise, as expected. Conclusion The implemented cardiovascular magnetic resonance method shows potential for the quantitative assessment of mOEF in vivo. Future technical work is needed to improve image quality and to further validate mOEF measurements.