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• W2105201581 abstract "Purpose To introduce a method based on multivolume proton (hydrogen [1H]) magnetic resonance (MR) imaging for the regional assessment of lung ventilatory function, investigating its use in healthy volunteers and patients with obstructive lung disease and comparing the outcome with the outcome of the research standard helium 3 (3He) MR imaging. Materials and Methods The institutional review board approved the HIPAA-compliant protocol, and informed written consent was obtained from each subject. Twenty-six subjects, including healthy volunteers (n = 6) and patients with severe asthma (n = 11) and mild (n = 6) and severe (n = 3) emphysema, were imaged with a 1.5-T whole-body MR unit at four lung volumes (residual volume [ RV residual volume ], functional residual capacity [ FRC functional residual capacity ], 1 L above FRC functional residual capacity [ FRC+1 L 1 L above FRC ], total lung capacity [ TLC total lung capacity ]) with breath holds of 10–11 seconds, by using volumetric interpolated breath-hold examination. Each pair of volumes were registered, resulting in maps of 1H signal change between the two lung volumes. 3He MR imaging was performed at FRC+1 L 1 L above FRC by using a two-dimensional gradient-echo sequence. 1H signal change and 3He signal were measured and compared in corresponding regions of interest selected in ventral, intermediate, and dorsal areas. Results In all volunteers and patients combined, proton signal difference between TLC total lung capacity and RV residual volume correlated positively with 3He signal (correlation coefficient R2 = 0.64, P < .001). Lower (P < .001) but positive correlation results from 1H signal difference between FRC functional residual capacity and FRC+1 L 1 L above FRC (R2 = 0.44, P < .001). In healthy volunteers, 1H signal changes show a higher median and interquartile range compared with patients with obstructive disease and significant differences between nondependent and dependent regions. Conclusion Findings in this study demonstrate that multivolume 1H MR imaging, without contrast material, can be used as a biomarker for regional ventilation, both in healthy volunteers and patients with obstructive lung disease. © RSNA, 2014" @default.
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• W2105201581 date "2014-11-01" @default.
• W2105201581 modified "2023-09-24" @default.
• W2105201581 title "Assessment of Regional Lung Function with Multivolume¹H MR Imaging in Health and Obstructive Lung Disease: Comparison with³He MR Imaging" @default.
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• W2105201581 doi "https://doi.org/10.1148/radiol.14132470" @default.
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