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01-11-2016 | Original Article

Novel technique for high-precision stereotactic irradiation of mouse brains

Authors: J. Hartmann, J. Wölfelschneider, C. Stache, R. Buslei, A. Derer, M. Schwarz, T. Bäuerle, R. Fietkau, U. S. Gaipl, C. Bert, A. Hölsken, B. Frey

Published in: Strahlentherapie und Onkologie | Issue 11/2016

Abstract

Background and purpose

Small animal irradiation systems were developed for preclinical evaluation of tumor therapy closely resembling the clinical situation. Mostly only clinical LINACs are available, so protocols for small animal partial body irradiation using a conventional clinical system are essential. This study defines a protocol for conformal brain tumor irradiations in mice.

Materials and methods

CT and MRI images were used to demarcate the target volume and organs at risk. Three 6 MV photon beams were planned for a total dose of 10 fractions of 1.8 Gy. The mouse position in a dedicated applicator was verified by an X‑ray patient positioning system before each irradiation. Dosimetric verifications (using ionization chambers and films) were performed. Irradiation-induced DNA damage was analyzed to verify the treatment effects on the cellular level.

Results

The defined treatment protocol and the applied fractionation scheme were feasible. The in-house developed applicator was suitable for individual positioning at submillimeter accuracy of anesthetized mice during irradiation, altogether performed in less than 10 min. All mice tolerated the treatment well. Measured dose values perfectly matched the nominal values from treatment planning. Cellular response was restricted to the target volume.

Conclusion

Clinical LINAC-based irradiations of mice offer the potential to treat orthotopic tumors conformably. Especially with respect to lateral penumbra, dedicated small animal irradiation systems exceed the clinical LINAC solution.

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Title: Novel technique for high-precision stereotactic irradiation of mouse brains
Authors: J. Hartmann
J. Wölfelschneider
C. Stache
R. Buslei
A. Derer
M. Schwarz
T. Bäuerle
R. Fietkau
U. S. Gaipl
C. Bert
A. Hölsken
B. Frey
Publication date: 01-11-2016
Publisher: Springer Berlin Heidelberg
Published in: Strahlentherapie und Onkologie / Issue 11/2016
Print ISSN: 0179-7158
Electronic ISSN: 1439-099X
DOI: https://doi.org/10.1007/s00066-016-1014-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Novel technique for high-precision stereotactic irradiation of mouse brains

Abstract

Background and purpose

Materials and methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background and purpose

Materials and methods

Results

Conclusion

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