DETERMINING CATHETER-TIP 3D LOCATION AND ORIENTATION USING FLUOROSCOPY AND IMPEDANCE MEASUREMENTS

A method for determining the 3D location of a catheter distal end portion (28) in a patient's body, the distal end portion including an electrode (E1, the method comprising: (a) placing first (30) and second (32) body-surface patches on the patient in positions such that body region of interest is therebetween; (b) driving an alternating current between the patches (30, 32); (c) measuring the voltage at the electrode (E1 and substantially contemporaneously capturing a 2D fluoroscopic image of the region of interest; and (d) determining the 3D location of the catheter distal end portion (28) from the image and the measured voltage. A primary application of this method is 3D navigation during cardiac interventional procedures. 一种用于确定患者体内的导管远端部分(28)的3D位置的方法，该远端部分包括电极(E)，该方法包括：(a)将第一体表贴片(30)和第二体表贴片(32)放置在患者身上的位置处，使得感兴趣的身体区域位于它们之间；(b)在贴片(30，32)之间驱动交流电流；(c)测量电极(E)处的电压，并基本上同时捕获感兴趣区域的2D荧光镜图像；以及(d)根据图像和测得的电压确定导管远端部分(28)的3D位置。这种方法的主要应用是心脏介入规程期间的3D导航。