• Clinical radiology · May 2021

    Evaluation of pulmonary ventilation in COVID-19 patients using oxygen-enhanced three-dimensional ultrashort echo time MRI: a preliminary study.

    • F Zhao, L Zheng, F Shan, Y Dai, J Shen, S Yang, Y Shi, K Xue, and Z Zhang.
    • Department of Radiology, Shanghai Public Health Clinical Center, Fudan University, Shanghai 201508, China; Department of Radiology, The First Affiliated Hospital of Xiamen University, Xiamen, China.
    • Clin Radiol. 2021 May 1; 76 (5): 391.e33-391.e41.

    AimTo evaluate the lung function of coronavirus disease 2019 (COVID-19) patients using oxygen-enhanced (OE) ultrashort echo time (UTE) MRI.Materials And MethodsForty-nine patients with COVID-19 were included in the study. The OE-MRI was based on a respiratory-gated three-dimensional (3D) radial UTE sequence. For each patient, the percent signal enhancement (PSE) map was calculated using the expression PSE = (S100% - S21%)/S21%, where S21% and S100% are signals acquired during room air and 100% oxygen inhalation, respectively. Agreement of lesion detectability between UTE-MRI and computed tomography (CT) was performed using the kappa test. The Mann-Whitney U-test was used to evaluate the difference in the mean PSE between mild-type COVID-19 and common-type COVID-19. Spearman's test was used to assess the relationship between lesion mean PSE and lesion size. Furthermore, the Mann-Whitney U-test was used to evaluate the difference in region of interest (ROI) mean PSE between normal pulmonary parenchyma and lesions. The Kruskal-Wallis test was applied to test the difference in the mean PSE between different lesion types.ResultsCT and UTE-MRI reached good agreement in lesion detectability. Ventilation measures in mild-type patients (5.3 ± 5.5%) were significantly different from those in common-type patients (3 ± 3.9%). Besides, there was no significant correlation between lesion mean PSE and lesion size. The mean PSE of COVID-19 lesions (3.2 ± 4.9%) was significantly lower than that of the pulmonary parenchyma (5.4 ± 3.9%). No significant difference was found among different lesion types.ConclusionOE-UTE-MRI could serve as a promising method for the assessment of lung function or treatment management of COVID-19 patients.Copyright © 2021 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.

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