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Published in: European Journal of Nuclear Medicine and Molecular Imaging 4/2020

01-04-2020 | Editorial

166Ho microsphere scout dose for more accurate radioembolization treatment planning

Authors: C Chiesa, M Maccauro

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 4/2020

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Excerpt

Radioembolization is nowadays dominated by 99mTc MAA for pretreatment study of biodistribution and dosimetry, and by 90Y microspheres for therapy Physical properties of such radionuclide are: 64 h half-life, beta emission maximal energy 2280 keV, beta abundance 99.9%, no gamma, and 32 positron emissions per million of transformations. A new kind of medical device available for therapy recently became commercially available also for planning: polylactic acid (PLLA) microspheres labeled with 166Ho. Such radionuclide has a 26.8 h half-life, dual beta emission with maximal energy of 1770 keV (49%)–1850 keV (50%) and, new aspect, it is paramagnetic and it emits gamma photons at 81 keV, with low abundance (6.7%). Gamma photons allow SPECT/CT imaging and dosimetry (some days after therapy to avoid gammacamera saturation) [1], while paramagnetism gives the additional possibility of post-therapy MRI evaluation. Publications about the use of 166Ho in therapy are available [2, 3], but this application is not under discussion here. …
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Metadata
Title
166Ho microsphere scout dose for more accurate radioembolization treatment planning
Authors
C Chiesa
M Maccauro
Publication date
01-04-2020
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 4/2020
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-019-04617-9

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