A system for analyzing ultrasound image data, the system comprising: at least one anatomical reference marker positionable on a patient during an imaging session; a position sensor coupleable to a handheld ultrasound probe; and a processor having an image input module connected to a signal output of the ultrasound probe to receive the ultrasound image data acquired from a region of interest during the imaging session, the ROI comprising a breast; processor further comprising: at least one tracking module (23, 25) connected to a signal output of the at least one anatomical reference marker and to a signal output of the sensor coupled to the handheld ultrasound probe to receive positional data therefrom during the imaging session; a registration module that co-registers a plurality of images generated from the ultrasound image data based on the positional data received from the at least one anatomical reference marker and the positional data received from the sensor; a surface contour module that generates a surface contour of the breast and tracks movement of the surface contour between the plurality of images, the surface contour representing an interface between a chest wall structure and breast tissue in the plurality of images; and a display module that generates a display of the surface contour as an overlay on a graphic representation of the ROI; the system further comprising a completeness module that generates a completeness map of the ultrasound image data acquired during the imaging session as an overlay on the graphic representation of the ROI. at least one anatomical reference marker positionable on a patient during an imaging session; a position sensor coupleable to a handheld ultrasound probe; and a processor having an image input module connected to a signal output of the ultrasound probe to receive the ultrasound image data acquired from a region of interest during the imaging session, the ROI comprising a breast; processor further comprising: at least one tracking module (23, 25) connected to a signal output of the at least one anatomical reference marker and to a signal output of the sensor coupled to the handheld ultrasound probe to receive positional data therefrom during the imaging session; a registration module that co-registers a plurality of images generated from the ultrasound image data based on the positional data received from the at least one anatomical reference marker and the positional data received from the sensor; a surface contour module that generates a surface contour of the breast and tracks movement of the surface contour between the plurality of images, the surface contour representing an interface between a chest wall structure and breast tissue in the plurality of images; and a display module that generates a display of the surface contour as an overlay on a graphic representation of the ROI; the system further comprising a completeness module that generates a completeness map of the ultrasound image data acquired during the imaging session as an overlay on the graphic representation of the ROI. at least one tracking module (23, 25) connected to a signal output of the at least one anatomical reference marker and to a signal output of the sensor coupled to the handheld ultrasound probe to receive positional data therefrom during the imaging session; a registration module that co-registers a plurality of images generated from the ultrasound image data based on the positional data received from the at least one anatomical reference marker and the positional data received from the sensor; a surface contour module that generates a surface contour of the breast and tracks movement of the surface contour between the plurality of images, the surface contour representing an interface between a chest wall structure and breast tissue in the plurality of images; and a display module that generates a display of the surface contour as an overlay on a graphic representation of the ROI; the system further comprising a completeness module that generates a completeness map of the ultrasound image data acquired during the imaging session as an overlay on the graphic representation of the ROI.