title: Mammography focal spot measurement with a star pattern: techniques to avoid inaccuracies.
abstract: The increased emphasis on mammography acceptance testing and quality control make the star pattern test an essential component of the procedure for diagnosing poor resolution due to large focal spots. In this paper procedures for calculating magnification and the correct angle of the star pattern to use are described. The preferred placement of the star pattern in the field and proper exposure technique is also discussed.
authors.affiliation: Iris Cantor Center for Breast Imaging, UCLA School of Medicine 90024.
authors.forename: C
authors.initials: C
authors.lastname: Kimme-Smith
authors.forename: A
authors.initials: A
authors.lastname: Chatziioannou
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008327:Mammography / Q000379:methods / Q000592:standards* / Q000706:statistics & numerical data; D011786:Quality Control