1. A device-assisted method for tracking a surgical implement previously introduced into a patient, the method comprising: obtaining sequential images of the patient; using a processor circuit, probabilistically analyzing individual sections of one of the images to generate a probabilistic analysis, the individual sections selected using information about a previous position of the surgical implement as identified in at least one preceding one of the images; and using the processor circuit, identifying the surgical implement in individual images at least in part using the probabilistic analysis and information about an identification of the surgical implement in at least one preceding one of the images.