title: The four S's: a response to market forces influencing imaging.
authors.affiliation: Department of Diagnostic Radiology, NorthShore University HealthSystem-Northwestern University, 2650 Ridge Ave., Evanston, IL 60201, USA. jonathanberlin@yahoo.com
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Berlin
mesh_terms: D000068:Accreditation; D003952:Diagnostic Imaging / Q000191:economics*; D006801:Humans; D016247:Information Storage and Retrieval / Q000191:economics; D007349:Insurance, Health, Reimbursement / Q000191:economics*; D006278:Medicare / Q000191:economics*; D011871:Radiology / Q000191:economics / Q000458:organization & administration*; D014481:United States; D019564:Unnecessary Procedures / Q000191:economics