title: Quality assurance for grey-scale imaging.
authors.affiliation: Medical Physics Department, University of Wisconsin, Madison, WI 53706-1532, USA.
authors.forename: E L
authors.initials: EL
authors.lastname: Madsen
mesh_terms: D001330:Electronic Data Processing; D006801:Humans; D019047:Phantoms, Imaging; D011785:Quality Assurance, Health Care; D012449:Safety; D014463:Ultrasonography / Q000592:standards*