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High-spatial-resolution ventilation MR image (left) and MR image acquired with gaseous 129Xe signal emerging in the airspaces after 129Xe-saline injection (right). The injected image shows hypointense region (arrow) in the area of the right descending mainstem bronchus where there is no gas exchange and hence no emerging airspace 129Xe. Both images show gaseous 129Xe; only the delivery method was different.
