Abstract: A system includes a processor and a display. The processor is configured to: (i) receive a first three-dimensional (3D) ultrasound (US) image of a volume of an organ of a patient, (ii) present at least first and second two-dimensional (2D) slices selected in the first 3D US image, (iii) receive first and second 2D contours including a region of interest (ROI) in the volume of the organ, which are selected in the first and second 2D slices, respectively, and (iv) produce, based on the first and second 2D contours, a second 3D US image of the ROI. The display is configured to present the second 3D US image to a user.

Abstract: A system includes a display and a processor. The processor obtains a three-dimensional mesh representing a first anatomical portion and a second anatomical portion, which is connected to the first anatomical portion. The processor receives, from a user, an input indicating a boundary between the first and second anatomical portions, fits a closed curve to multiple points on the mesh based on the input, and performs an iterative process, in response to the curve not segmenting the mesh into two separate parts, until the curve segments the mesh into two separate parts. Each iteration includes moving each of the points to another location on the mesh, and subsequently to moving each point, refitting the curve to the points. The processor is further configured to display the mesh on the display, based on the curve, so as to demarcate the first anatomical portion from the second anatomical portion.