The present invention relates to an ultrasound imaging system and a method for the measurement of a distance (58) between two points (54, 56) within a volume of a three-dimensional image (50). To avoid the commonly known fore-shortening effect, according to which a distance measured by the system is shorter than an actual distance (58) between the two points (54, 56), an in-depth control of a cursor (53) shown in the image (50) on the display as provided to the user. Further, an indication (72) may be given to the user that the cursor (53) collides with a structure (52) within the volume to allow the user to assess the movement of the cursor out of the plane shown on the display more conveniently. By this, occurrence of the fore-shortening effect may be avoided.