1. A method of using a tracking system for performing a biopsy, the method comprising acts of: providing a probe with a deployable biopsy needle; acquiring diagnostic images of a target region including a biopsy site; registering the tracking system with the diagnostic images; obtaining ultrasound images of the target region during the biopsy; the tracking system acquiring tracking information for a location of at least one of the biopsy needle and the probe during the biopsy; marking the location at the biopsy site on the ultrasound images; and transforming the location at the biopsy site from the ultrasound images to the diagnostic images based on the tracking information and the registration of the tracking system with the diagnostic images.