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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: J Magn Reson Imaging. 2018 Sep 25;49(3):659–667. doi: 10.1002/jmri.26296

Figure 4.

Figure 4

Representative MRI results for a neonatal patient with severe bronchopulmonary dysplasia (BPD) and bronchoscopically-diagnosed tracheomalacia (TM). Collapse of the posterior tracheal wall at endexpiration is clear on both clinically-obtained bronchoscopic images and retrospectively respiratory-gated ultrashort echo-time (UTE) MRI results. The tracheal lumens are outlined on end-expiration and endinspiration UTE axial images in pink and green, respectively. Gated UTE-based tracheal surfaces are shown, along with corresponding geometric analysis along the intrathoracic trachea: cross-sectional areas (CSA) at end-expiration (pink) and end-inspiration (green); and percentage reduction in CSA (A%, black). Quantitative MRI results of dynamic collapse, particularly notable throughout the middle and lower tracheal regions, agree with qualitative bronchoscopic results.