Overview Asthma Exacerbation and Helium-3 MRI Status: Withdrawn Trial end date: 2011-08-01 Target enrollment: Participant gender: Summary The goal of this research is to use Helium-3 MRI to see the changes in airflow of the lungs at different times of an attack. These three stages are immediately after the attack, 1 month later and 4-6 months later. Phase: N/A Details Lead Sponsor: University of Massachusetts, Worcester