Patent ID: 8781196

Claim:
A method for defining a volume of interest (VOI) in an ultrasound imaging space, wherein the VOI is used in generating a three-dimensional image, the method comprising: defining an initial frame of the VOI in the ultrasound imaging space; receiving a selection of at least one reference point at an arbitrary location in the ultrasound imaging space, wherein receiving a selection of at least one reference point further comprises: receiving a selection of at least one reference plane in the ultrasound imaging space; receiving a selection of at least one proxy reference point in the reference planes; and updating the reference points using reversed projection points of the proxy reference points, wherein the reversed projection points are obtained by projecting the proxy reference points according to a reversed projection relationship which is reversed to the projection relationship according to which the reference points are projected to the reference planes; creating at least one curved surface using at least one element of the initial frame and the at least one reference point; and creating the VOI based on the curved surface in the ultrasound imaging space.