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 a plurality of CS sinus 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 detectors; generating catheter electrode model candidates in the second frame based on the detected electrode position candidates; calculating a probability score for each of the catheter electrode model candidates; and selecting one of the catheter electrode model candidates based on the probability score, wherein the selected catheter electrode model candidate provides locations of the plurality of CS sinus catheter electrodes in the second frame.