3. The method of claim 1 , wherein the step of initializing a catheter electrode model in a first frame of a fluoroscopic image sequence based on input locations of a plurality of CS catheter electrodes in the first frame comprises: determining a number of CS catheter electrodes in the first frame; and if the number of CS catheter electrodes in the first frame is greater than a threshold, decomposing the plurality of CS catheter electrodes into multiple parts, and initializing separate catheter electrode models in the first frame for the multiple parts, wherein the catheter electrode model initialized in the first frame comprises the separate catheter electrode models initialized for the multiple parts.
1. A method for detecting and tracking coronary sinus (CS) catheter electrodes in a fluoroscopic image sequence comprising: initializing a catheter electrode model in a first frame of a fluoroscopic image sequence based on input locations of a plurality of CS catheter electrodes in the first frame, wherein the catheter electrode model in the first frame comprises a plurality of template points corresponding to locations of the CS catheter electrodes in the first frame; and tracking the catheter electrode model in a second frame of the fluoroscopic image sequence by: detecting electrode position candidates in a second frame of the fluoroscopic image sequence using at least one trained electrode detector; generating catheter electrode model candidates in the second frame based on the detected electrode position candidates and the catheter electrode model initialized in the first frame by translating each of the plurality of template points of the catheter electrode model initialized in the first frame to each of the detected electrode position candidates in the second frame; calculating a probability score for each of the catheter electrode model candidates in the second frame; and selecting one of the catheter electrode model candidates in the second frame based on the probability score, wherein the selected catheter electrode model candidate provides locations of the plurality of CS catheter electrodes in the second frame.