 Hyper polarized xenon-129 MRI HXe MRI is a unique imaging test which can detect how air is flowing in and out of lungs and how oxygen can move from inhaled air into the blood. Chronic Obstructive Pulmonary Disease COPD is a disease in which patients develop narrowing of airways, thus, having difficulties breathing air in and out their lungs and also damaging the lung tissues which patients need to move oxygen from the air into blood. 