A method for producing a three-dimensional image (70) of an object. The method includes providing a model (8) of the object (62) (200), insonifying regions of the object from source transducers (58) external to the object (62) (202), receiving return echoes from the object (62) at receiving transducers (58) external to the object (62), processing the return echoes (204) and generating a hybrid image (70) of the object (62) comprising object regions responsive to the model (8) of the object (62) and object regions responsive to the return echoes (208/212).