Freehand 3D/4D ultrasound: Extending existing U/S devices

3D ultrasound is the extension of 2D ultrasound to the third dimension. In case of acquiring heat motion, we speak about 4D (3 spatial and one temporal dimension). Our 3D/4D approach uses a 2D transducer in a free-scan technique where the transducer movement (performed by the physician) is measured by an additional tracking device. Freehand acquisition requires no intervention in the ultrasound devices and is therefore an upgrade possibility for nearly every conventional 2D device