Three-Dimensional Endovascular Navigation With Electromagnetic Tracking: Ex Vivo and In Vivo Accuracy

• DOI: 10.1583/10-3301.1
• Publication Date: 2011-04-26T20:46:49Z
• Authors: Frode Manstad-Hulaas; Geir Arne Tangen; Lucian Gheorghe G...; Petter Aadahl; Toril A. N. Hernes
• Keywords: Aortic Aneurysm, Thoracic; Phantoms, Imaging; Endovascular Procedures; Sus scrofa; Reproducibility of Results; Equipment Design; 03 medical and health sciences; Imaging, Three-Dimensional; 0302 clinical medicine; Surgery, Computer-Assisted; Models, Animal; Animals; Radiographic Image Interpretation, Computer-Assisted; Tomography, X-Ray Computed; Electromagnetic Phenomena

To evaluate the accuracy of a 3-dimensional (3D) navigation system using electromagnetically tracked tools to explore its potential in patients.The 3D navigation accuracy was quantified on a phantom and in a porcine model using the same setup and vascular interventional suite. A box-shaped phantom with 16 markers was scanned in 5 different positions using computed tomography (CT). The 3D navigation system registered each CT volume in the magnetic field. A tracked needle was pointed at the physical markers, and the spatial distances between the tracked needle positions and the markers were calculated. Contrast-enhanced CT images were acquired from 6 swine. The 3D navigation system registered each CT volume in the magnetic field. An electromagnetically tracked guidewire and catheter were visualized in the 3D image and navigated to 4 specified targets. At each target, the spatial distance between the tracked guidewire tip position and the actual position, verified by a CT control, was calculated.The mean accuracy on the phantom was 1.28±0.53 mm, and 90% of the measured distances were ≤1.90 mm. The mean accuracy in swine was 4.18±1.76 mm, and 90% of the measured distances were ≤5.73 mm.This 3D navigation system demonstrates good ex vivo accuracy and is sufficiently accurate in vivo to explore its potential for improved endovascular navigation.