Int J Comput Assist Radiol Surg - Image-based electrode array tracking for epicardial electrophysiological mapping in minimally invasive arrhythmia surgery.

Tópicos

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Resumo

RPOSE: Electrophysiological mapping is effective in realizing a precise minimally invasive arrhythmia surgery. Recently, an epicardial electrophysiological mapping system for minimally invasive arrhythmia surgery was reported. The system requires a small electrode array, a tracking system and a global mapping algorithm. The optical tracking system employed in the research requires line of sight and complicated configuration. This paper proposes a new tracking method for locating an electrode array.METHODS: We developed a small electrode array and optical markers. Center points of respective optical markers and the electrode array are tracked via an endoscopic stream and calculated in image space. The orientation of the electrode array is calculated using the dot product between the vector joining two center points of two upper optical markers and the vector joining two end points of the longest edge of the electrode array.RESULTS: Mean tracking errors of position and orientation of the electrode array were 0.51 mm and 0.64?, respectively. And the processing time was constant at 46 ms per frame. Our method could successfully track the electrode array on the epicardium during in vivo experiment and a global epicardial electrophysiological map was reconstructed from separately measured epicardial electrograms by the small electrode array.CONCLUSIONS: An image-based tracking method for locating an electrode array was proposed. Tracking accuracy, processing time and applicability to surgical environment of our method proved to be acceptable. Consequently, our method enables the electrode array tracking system to be simplified with no separate tracking system.

Resumo Limpo

rpose electrophysiolog map effect realiz precis minim invas arrhythmia surgeri recent epicardi electrophysiolog map system minim invas arrhythmia surgeri report system requir small electrod array track system global map algorithm optic track system employ research requir line sight complic configur paper propos new track method locat electrod arraymethod develop small electrod array optic marker center point respect optic marker electrod array track via endoscop stream calcul imag space orient electrod array calcul use dot product vector join two center point two upper optic marker vector join two end point longest edg electrod arrayresult mean track error posit orient electrod array mm respect process time constant ms per frame method success track electrod array epicardium vivo experi global epicardi electrophysiolog map reconstruct separ measur epicardi electrogram small electrod arrayconclus imagebas track method locat electrod array propos track accuraci process time applic surgic environ method prove accept consequ method enabl electrod array track system simplifi separ track system

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