title: A rapid phantom technique for checking blocked vertex fields.
abstract: A simple phantom technique for quality assurance in beam arrangements involving a vertex field is described. Clinical personnel can quickly check that blocks for the vertex field have been cut to the proper magnification and that the vertex field is in proper registration with accompanying isocentric transverse fields. Errors can be identified rapidly and corrections made with no inconvenience to the patient.
authors.affiliation: George Washington University Medical Center, Division of Radiation Oncology and Biophysics, Washington, DC 20037, USA.
authors.forename: E D
authors.initials: ED
authors.lastname: Yorke
authors.forename: L
authors.initials: L
authors.lastname: Der
authors.forename: K
authors.initials: K
authors.lastname: Wechsler-Jentzsch
mesh_terms: D006801:Humans; D019047:Phantoms, Imaging; D011785:Quality Assurance, Health Care; D011878:Radiotherapy / Q000295:instrumentation / Q000379:methods*