A user interface element for a diagnostic ultrasound system including a user determined seed point, a perimeter defining a closed region of similar echoic intensity surrounding the seed point, here that region corresponds to a cross section through a physical feature within a body, a first calculated value being an area of said closed region, a second calculated value being a volume of said physical feature, calculated using preselected assumptions about the shape of the physical feature, wherein the perimeter is user adjustable.
