1. Center for In-Vivo Hyperpolarized Gas MRI, Department of Radiology and Medical Imaging; University of Virginia; Charlottesville VA USA
2. Department of Biomedical Engineering; University of Virginia; Charlottesville VA USA
3. Pulmonary Imaging Laboratory, Department of Medicine; University of California, San Diego; La Jolla CA USA
4. Pulmonary Imaging Laboratory, Department of Radiology; University of California, San Diego; La Jolla CA USA