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European Journal of Nuclear Medicine and Molecular Imaging

Erschienen in:

14.09.2016 | Editorial

Effective and equivalent dose minimization for personnel in PET procedures: how far are we from the goal?

verfasst von: M. Lecchi, S. Malaspina, A. Del Sole

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 13/2016

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Radiation dose limitation in patients undergoing nuclear medicine procedures is accomplished through adherence to the principles of justification and optimization, while radiation doses to operators are controlled mainly by reducing exposure times, using shielding, and increasing the distance from the source. In both cases, however, a key role in dose management can also be played by innovative technologies, making this an important issue not only for nuclear medicine specialists, medical physicists, and technologists, but also for biomedical engineers and for industry [1‐3].¹ …

The decay of positron emitters produces four times the amount of energy in photons than the decay of technetium-99 m does. The gamma ray constant of 511 keV annihilation photons is 1.81 μSv/h per MBq at 30 cm from an unshielded point source, while that of 140 keV photons is 0.26 μSv/h per MBq at 30 cm from an unshielded point source. Whereas the half-value layer (HVL) of 140 keV photons consists of approximately 0.03 cm of lead, 4.5 cm of water and 4000 cm of air, the HVL of 511 keV photons comprises approximately 0.6 cm of lead, 7.5 cm of water, and 6500 cm of air. For the sake of comparison, the dose rate due to a given technetium-99 m activity corresponds to 14 % of that delivered by the same amount of fluorine-18 activity.

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Titel: Effective and equivalent dose minimization for personnel in PET procedures: how far are we from the goal?
verfasst von: M. Lecchi
S. Malaspina
A. Del Sole
Publikationsdatum: 14.09.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 13/2016
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-016-3513-3

Springer Medizin

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