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. 2020 Nov 2;10:18835. doi: 10.1038/s41598-020-75925-6

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© The Author(s) 2020

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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Setup and operation of the navigation system for ablation of malignant liver tumors. (a) A precise setting of the aiming device is crucial for optimal probe positioning. It is important that the positioning is always performed in apnoea, otherwise, major deviations must be expected. (b) Device setting and patient positioning: The computed tomography (CT)- and navigation-device-monitors are placed on the opposite side of the specialist. The tracking camera must be freely positioned to ensure optimal navigation. The aiming device is fixed on the side of the specialist. (c) The probe is fixed in the provided holder and the fine adjustment is made before puncturing the skin. It is important to place the optical markers outside the stitch area. (d) One of the two monitors should be covered in sterile material so that the specialist can check and readjust the optimal probe position directly.