Using medical imaging to diagnose and treat stroke leads to better outcomes and shorter hospital stays, which yields a net economic benefit of about $8 billion over 10 years.
Johnston S, Rootenberg J, Katrak S, Smith W, et al. Effect of a U.S. National Institute of Health Programme of Clinical Trials in Public Health and Costs. The Lancet. 2006; 367: 1319-27. https://pubmed.ncbi.nlm.nih.gov/16631910/