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This can be detrimental to the surgical workflow and lead to additional radiation burdens for both patient and personnel. To overcome this problem, we present our novel approach <jats:italic>Lidar-based X-ray Positioning for Mobile C-arms<\/jats:italic> (RAY-POS) for assisting circulating nurses during intraoperative C-arm repositioning without requiring external aids.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>RAY-POS consists of a localization module and a graphical user interface for guiding the user back to a previously recorded C-Arm position. We conducted a systematic comparison of simultaneous localization and mapping (SLAM) algorithms using different attachment positions of light detection and ranging (LIDAR) sensors to benchmark localization performance within the operating room (OR). For two promising combinations, we conducted further end-to-end repositioning tests within a realistic OR setup.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>SLAM algorithm <jats:italic>gmapping<\/jats:italic> with a LIDAR sensor mounted 40\u00a0cm above the C-arm\u2019s horizontal unit performed best regarding localization accuracy and long-term stability. The distribution of the repositioning error yielded an effective standard deviation of 7.61\u00a0mm.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>We conclude that a proof-of-concept for LIDAR-based C-arm repositioning without external aids has been achieved. In future work, we mainly aim at extending the capabilities of our system and evaluating the usability together with clinicians.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s11548-022-02571-w","type":"journal-article","created":{"date-parts":[[2022,2,23]],"date-time":"2022-02-23T08:03:24Z","timestamp":1645603404000},"page":"719-729","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["RAY-POS: a LIDAR-based assistance system for intraoperative repositioning of mobile C-arms without external aids"],"prefix":"10.1007","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9729-8928","authenticated-orcid":false,"given":"Lukas","family":"Bernhard","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"V\u00f6lk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"V\u00f6lk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florian","family":"Rothmeyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhencan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Ostler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Biberthaler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dirk","family":"Wilhelm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,2,23]]},"reference":[{"issue":"15","key":"2571_CR1","doi-asserted-by":"publisher","first-page":"1254","DOI":"10.1097\/BRS.0000000000001542","volume":"41","author":"K Yamashita","year":"2016","unstructured":"Yamashita K, Higashino K, Wada K, Morimoto M, Abe M, Takata Y, Sakai T, Fukui Y, Sairyo K (2016) Radiation exposure to the surgeon and patient during a fluoroscopic procedure: how high is the exposure dose? 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