A method for determining a projected track of an object (230) includes measuring movement from frame to frame of a detected object point in a field of view by periodic comparison of positions, extrapolating a locus of periodically detected object points, and qualifying the locus by calculating and applying a threshold to the linearity in a sequence of positions and a threshold to consistency in strength. The method further produces the plurality of ultrasound images by including thereon a rendering of a plurality of lines (310) as a path track indicator (330) on one or more ultrasound images (305) and displaying the projected track of the object when a user moves the tracked object a minimum distance in a region of interest (242) of a subject (240). The method also includes utilizing a motion sensor (234) with a probe (205) to suppress calculation and display of the projected track.
