Ms. Christine Hartung Profile

Christine Hartung

at Univ Ulm

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Proceedings Article | 13 March 2009 Paper

Computer-assisted LAD bypass grafting at the open heart

Christine Hartung, Claudia Gnahm, Reinhard Friedl, Martin Hoffmann, Klaus Dietmayer

Proceedings Volume 7261, 72610P (2009) https://doi.org/10.1117/12.813850

KEYWORDS: Heart, Surgery, Video, Navigation systems, 3D image processing, Image registration, Visualization, Electrocardiography, Stereoscopic cameras, Imaging systems

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Open heart bypass surgery is the standard treatment in advanced coronary heart diseases. For an effective revascularization procedure, optimal placement of the bypass is very important. To accelerate the intraoperative localization of the anastomosis site and to increase the precision of the procedure, a concept for computer assistance in open heart bypass surgery has been developed comprising the following steps: 1. Preprocedural planning: A patient-specific coronary map with information on vessel paths and wall plaque formations is extracted from a multi-slice computed tomography (MSCT). On this basis, the heart surgeon and the cardiac radiologist define the optimal anastomosis site prior to surgery. 2. Intraoperative navigation: During surgery, data are recorded at the beating heart using a stereo camera system. After registering the pre- and intraoperative data sets, preprocedural information can be transferred to the surgical site by overlaying the coronary map and the planned anastomosis site on the live video stream. With this visual guidance system, the surgeon can navigate to the planned anastomosis site. In this work, the proposed surgical assistance system has been validated for the left anterior descending coronary artery (LAD). The accuracy of the registration mechanism has been evaluated in retrospective on patient data sets and the effects of breathing motion were quantified. The promising results of the retrospective evaluation led to the in-vivo application of the computer assistance system during several bypass grafting procedures. Intraoperative navigation has been performed successfully and postoperative evaluation confirms that the bypass grafts were accurately positioned to the preoperatively planned anastomosis sites.

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