1. A method for estimating sensor locations in radiographic images, comprising: radiographically imaging a body organ containing a plurality of radiopaque sensors to provide a series of images comprising a first and second groups of chronologically captured images and a third group of chronologically captured images chronologically interposed between the first and second groups of images, each image of the first and second groups of images comprising a number of discernible sensors that is equal to or greater than a threshold number, each image of the third group of images comprising a number of discernible sensors that is less than the threshold number; estimating sensor locations in images in the first and second groups of images, the estimating comprising, separately in each group, (i) reconstructing sensor locations of discernible sensors, and (ii) determining sensor locations of indiscernible sensors based on the reconstructed locations of the discernable sensors; estimating sensor locations in images of the third group of images using estimated sensor locations in an image of the first group of images and in an image of the second group of images; and estimating additional sensor locations in images of the entire series of images based on the sensor locations estimated in the first, second and third image groups.