Devices on a back (IMAGE) Northwestern University Caption By placing devices on a patient's chest and back, health care worker can map a single breath as it moves through various regions in the lungs. Credit Northwestern University Usage Restrictions add credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.