1. An ultrasound display system for enabling a user to rapidly identify a region of interest (ROI) in a displayed ultrasound image without having to hand-trace an outline of said ROI, said ROI manifesting a fluid/tissue boundary defining a fluid volume, said system comprising: a display; ultrasound means including processor means for causing said display to manifest an ultrasound image of said fluid volume and said fluid/tissue boundary; user entry means for controlling a quick ROI procedure, user actuation of said user entry means causing said processor means to display a closed trace about said fluid volume and said fluid/tissue boundary on said displayed ultrasound image, said user entry means further enabling positional adjustment of said closed trace to substantially enclose said fluid volume and said fluid/tissue boundary.