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. 2022 Mar 31;198(6):537–546. doi: 10.1007/s00066-022-01916-3

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Example of treatment fields for hippocampus-avoidance whole brain radiotherapy with simultaneous integrated boost (HA-WBRT+SIB). Two complete arcs with a collimator angle near 0° (e.g., 5°) and two complete arcs with a collimator angle near 90° (e.g., 85°) are defined and the field openings are adapted to the PTV_WB. Afterwards the x‑jaws are closed such that two arcs with identical collimator angle only have a small overlap (2–3 cm). Light purple whole brain, dark purple hippocampi, PTV_WB planning target volume of the whole brain