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Three-dimensional spoiled gradient echo sagittal acquisition with axial and coronal reformats at (a–c) end-inspiration and (d–f) end-expiration in a 28-year-old female asthma patient. Note area of air trapping (thin arrow) in the left lower lobe with excessive collapse of trachea in the expiratory image (thick arrow). Acquisition time of 6 s with isotropic voxels of 3.0 × 3.0 × 3.0 mm3
