
Katarina Sjögreen Gleisner
Professor

Traceable calibration with 177Lu and comparison of activity meters at hospitals in Norway and Sweden
Författare
Summary, in English
Introduction: The activity meter is used to determine the activity of delivered radiopharmaceuticals, administered activity to patients and reference activity when gamma-cameras are calibrated prior to imaged-based dosimetry. The aim is to describe a procedure for cross-calibration of activity meters at different clinical sites, and report on 177Lu activity results when using factory-set calibration factors compared to when calibration is performed with traceability to a primary standard. Methods: Thirty activity meters placed at seven hospitals in Norway and Sweden from four manufacturers: Capintec, Commecer, NuviaTech and Veenstra were included. A stock solution with 177Lu was prepared at the local sites and measured in each activity meter with factory settings. The solution was shipped to the reference site at Lund University for measurements in a secondary standard activity meter. Deviations between local and reference activity measurements were determined for three geometries: 25-mL vial, 10-mL syringe and 1-mL syringe. Results: The median of the deviations was 6.4 % for the 25 mL vial, 5.9 % for the 10 mL syringe and 6.8 % for the 1 mL syringe. The median of the deviations for the 25 mL vial, was 1.5 % for activity meters from Capintec, 7.0 % for Comecer, 11.0 % for NuviaTech and 2.4 % for Veenstra. The majority of the deviations were positive and the maximum deviation was 14.5 %. Conclusion: The activity of 177Lu measured in an activity meter with factory-set dial settings may yield deviations up to 14.5%, compared to activities measured with traceability to a primary standard. This would imply an undertreatment of patients.
Avdelning/ar
- Medicinsk strålningsfysik, Lund
- Klinisk fysiologi, Lund
- Hjärt-MR-gruppen i Lund
- Nuclear Medicine Physics
Publiceringsår
2023-12
Språk
Engelska
Publikation/Tidskrift/Serie
Physica Medica
Volym
116
Dokumenttyp
Artikel i tidskrift
Förlag
ISTITUTI EDITORIALI E POLGRAFICI INTERNAZIONALI
Ämne
- Radiology, Nuclear Medicine and Medical Imaging
Nyckelord
- 177-Lutetium
- Activity meter
- Metrological traceability
- Radionuclide therapy
Aktiv
Published
Forskningsgrupp
- Lund Cardiac MR Group
- Nuclear Medicine Physics
ISBN/ISSN/Övrigt
- ISSN: 1120-1797