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Intelligent viewpoint selection for efficient CT to video registration in laparoscopic liver surgery.

Robu, MR; Edwards, P; Ramalhinho, J; Thompson, S; Davidson, B; Hawkes, D; Stoyanov, D; (2017) Intelligent viewpoint selection for efficient CT to video registration in laparoscopic liver surgery. Int J Comput Assist Radiol Surg 10.1007/s11548-017-1584-7. (In press). Green open access

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PURPOSE: Minimally invasive surgery offers advantages over open surgery due to a shorter recovery time, less pain and trauma for the patient. However, inherent challenges such as lack of tactile feedback and difficulty in controlling bleeding lower the percentage of suitable cases. Augmented reality can show a better visualisation of sub-surface structures and tumour locations by fusing pre-operative CT data with real-time laparoscopic video. Such augmented reality visualisation requires a fast and robust video to CT registration that minimises interruption to the surgical procedure. METHODS: We propose to use view planning for efficient rigid registration. Given the trocar position, a set of camera positions are sampled and scored based on the corresponding liver surface properties. We implement a simulation framework to validate the proof of concept using a segmented CT model from a human patient. Furthermore, we apply the proposed method on clinical data acquired during a human liver resection. RESULTS: The first experiment motivates the viewpoint scoring strategy and investigates reliable liver regions for accurate registrations in an intuitive visualisation. The second experiment shows wider basins of convergence for higher scoring viewpoints. The third experiment shows that a comparable registration performance can be achieved by at least two merged high scoring views and four low scoring views. Hence, the focus could change from the acquisition of a large liver surface to a small number of distinctive patches, thereby giving a more explicit protocol for surface reconstruction. We discuss the application of the proposed method on clinical data and show initial results. CONCLUSION: The proposed simulation framework shows promising results to motivate more research into a comprehensive view planning method for efficient registration in laparoscopic liver surgery.

Type: Article
Title: Intelligent viewpoint selection for efficient CT to video registration in laparoscopic liver surgery.
Location: Germany
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s11548-017-1584-7
Publisher version: http://dx.doi.org/10.1007/s11548-017-1584-7
Language: English
Additional information: © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: Gaussian curvature, Image guidance, Laparoscopic liver surgery, Rigid registration, View planning
URI: http://discovery.ucl.ac.uk/id/eprint/1549761
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