title: Syringe shape and positioning relative to efficiency volume inside dose calibrators and its role in nuclear medicine quality assurance programs.
abstract: A careful analysis of geometry and source positioning influence in the activity measurement outcome of a nuclear medicine dose calibrator is presented for (99m)Tc. The implementation of a quasi-point source apparent activity curve measurement is proposed for an accurate correction of the activity inside several syringes, and compared with a theoretical geometric efficiency model. Additionally, new geometrical parameters are proposed to test and verify the correct positioning of the syringes as part of acceptance testing and quality control procedures.
authors.affiliation: Serviço de Física Médica, Instituto Português de Oncologia do Porto Francisco Gentil, E.P.E., Rua Dr. António Bernardino de Almeida, 4200072 Porto, Portugal. a.miranda@portugalmail.pt
authors.forename: J A M
authors.initials: JA
authors.lastname: Santos
authors.forename: M F
authors.initials: MF
authors.lastname: Carrasco
authors.forename: J
authors.initials: J
authors.lastname: Lencart
authors.forename: A L
authors.initials: AL
authors.lastname: Bastos
mesh_terms: D009683:Nuclear Medicine / Q000295:instrumentation* / Q000592:standards; D011786:Quality Control; D011829:Radiation Dosage; D013594:Syringes / Q000592:standards*; D013667:Technetium
chemical_list: D013667:Technetium