Abstract: Disclosed is a single ultrasound imaging probe 101 comprising a single ultrasound transducer array 103 comprising a first array segment 201 comprising a K plurality of ultrasound transducer elements 103a and an orthogonally arranged second array segment 202 comprising an M plurality of ultrasound transducer elements 103b such that the first array segment 201 and the second array segment 202 comprise a K plurality of ultrasound transducer elements 103a plus an M plurality of ultrasound transducer elements 103b which are electrically connected to provide for the simultaneous display of a scan-converted transverse view ultrasound image and of a scan-converted longitudinal view ultrasound image in a video display 406 of a target scan region for three-dimensional alignment, guided by a projected light beam, of an exterior device in order to access an interior structure below the exterior target region.