Patent ID: 8838199

Claim:
A medical imaging system to compare a first set of images and a second set of images, comprising: a tracking subsystem having a dynamic reference frame marker configured to be physically attached to a patient, wherein the tracking subsystem is configured to detect the dynamic reference frame marker at both a first time to determine a first patient position data corresponding to a first set of images acquired with an imaging system and at a second time to determine a second patient position data corresponding to a second set of images acquired with the imaging system, where the first and second patient position data is indicative of a position of the patient, wherein the second time is after the first time; a motion correction subsystem operable to receive the first patient position data relative to the imaging system at the first time and second patient position data relative to the imaging system at the second time corresponding to each of the first and second sets of images and the motion correction subsystem is operable to determine a change between at least the first patient position data and the second patient position data, wherein said motion correction subsystem is operable to execute an algorithm to compare the first patient position data and the second patient position data to determine a change between the first patient position data at the first time and the second patient position data at the second time and correct at least one of the first set of images or the second set of images for differences in at least one of position or orientation based on the determined change in the second patient position data relative to the first patient position data; and an image subtraction subsystem operable to receive at least the first set of images and the second set of images, the image subtraction subsystem is operable to perform a digital subtraction operation between the first set of images and the second set of images to determine a difference between the first set of images and the second set of images when no change equal to or less than a threshold value occurs between the first and second patient position data.