An ultrasound image processing apparatus for obtaining a biometric measurement of an anatomical feature of interest from a 3-D ultrasound image, comprising a display apparatus communicatively coupled to a processor arrangement adapted to: render a volumetric ultrasound image along a viewing angle from the 3-D ultrasound image and control the display apparatus to display said rendered image, wherein the volume rendered ultrasound image depicts an intensity iso-surface; receive a plurality of user inputs highlighting the anatomical feature of interest, each input corresponding to a user-specified point on the display apparatus and corresponding to a pixel of the displayed volumetric image; mapping each of the user-specified points to a location within the volume rendered image with the depth being determined from a user's view ray coinciding with the iso-surface; define a 3-D path in the volumetric ultrasound image based on the received user inputs along said determined depths; perform a processing operation based on the defined 3-D path; and control the display apparatus to display the processing operation result, wherein the processing operation based on the defined 3-D path comprises a measurement of a length of the 3-D path, and at least one of: a reorientation of the rendered volumetric ultrasound image such that the 3-D path is aligned with the viewing angle along the rendered volumetric ultrasound image or perpendicular to a viewing angle along the rendered volumetric ultrasound image; and a generation of a 2-D image slice of the 3-D ultrasound image based on the defined 3-D path. render a volumetric ultrasound image along a viewing angle from the 3-D ultrasound image and control the display apparatus to display said rendered image, wherein the volume rendered ultrasound image depicts an intensity iso-surface; receive a plurality of user inputs highlighting the anatomical feature of interest, each input corresponding to a user-specified point on the display apparatus and corresponding to a pixel of the displayed volumetric image; mapping each of the user-specified points to a location within the volume rendered image with the depth being determined from a user's view ray coinciding with the iso-surface; define a 3-D path in the volumetric ultrasound image based on the received user inputs along said determined depths; perform a processing operation based on the defined 3-D path; and control the display apparatus to display the processing operation result, wherein the processing operation based on the defined 3-D path comprises a measurement of a length of the 3-D path, and at least one of: a reorientation of the rendered volumetric ultrasound image such that the 3-D path is aligned with the viewing angle along the rendered volumetric ultrasound image or perpendicular to a viewing angle along the rendered volumetric ultrasound image; and a generation of a 2-D image slice of the 3-D ultrasound image based on the defined 3-D path. a reorientation of the rendered volumetric ultrasound image such that the 3-D path is aligned with the viewing angle along the rendered volumetric ultrasound image or perpendicular to a viewing angle along the rendered volumetric ultrasound image; and a generation of a 2-D image slice of the 3-D ultrasound image based on the defined 3-D path.