A system and method for dynamically altering the analysis methodology of millimeter wave imagery in response to the range and direction of motion of a subject is disclosed. In a particular embodiment, an imaging zone of a scene is scanned using at least one millimeter wave camera during a current time frame and a CPU is used to dynamically process millimeter wave imagery of the imaging zone in response to detecting a range and direction of motion of the subject during a previous time frame. In addition, values of a grid of discrete cells are calculated representing the millimeter wave energy associated with the current time frame, which are then compared to values from a grid of corresponding discrete cells associated with the previous time frame in determining a current range and direction of the subject.