Ralph Metcalfe, professor of mechanical engineering and deputy director of the UH biomedical engineering program, and his graduate student, Aishwarya Mantha, are working on a new tool to improve brain aneurysm treatment. Metcalfe and Mantha are working with physicians and scientists at the Methodist Neurological Institute (NI) to determine which brain aneurysms are at highest risk of rupture and could cause a stroke.