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European Journal of Nuclear Medicine and Molecular Imaging
Published in: European Journal of Nuclear Medicine and Molecular Imaging 13/2016

01-12-2016 | Editorial

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

Authors: M. Lecchi, S. Malaspina, A. Del Sole

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 13/2016

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Excerpt

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 …
Footnotes
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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Metadata
Title
Effective and equivalent dose minimization for personnel in PET procedures: how far are we from the goal?
Authors
M. Lecchi
S. Malaspina
A. Del Sole
Publication date
01-12-2016
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 13/2016
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-016-3513-3

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