title: On several occasions I have heard it said that on an x-ray image one cannot see anything that is smaller than the effective size of the x-ray focal spot. Is it true?
authors.affiliation: Mayo Clinic/Mayo Foundation, Rochester, MN.
authors.forename: J G
authors.initials: JG
authors.lastname: Stears
authors.forename: J E
authors.initials: JE
authors.lastname: Gray
authors.forename: E D
authors.initials: ED
authors.lastname: Frank
mesh_terms: D006801:Humans; D011859:Radiography; D013679:Technology, Radiologic