A medical image processing apparatus comprises processing circuitry configured to: obtain a three-dimensional (3D) image that is representative of an anatomical region of a subject； acquire a stream of two-dimensional images that are representative of the anatomical region of the subject； set a first rendering direction by performing a 2D/3D registration procedure in respect of the 3D image and a 2D image of the stream of 2D images； generate a first rendered image from the 3D image based on the first rendering direction； and for each of a plurality of subsequent 2D images of the stream of 2D images, determine whether a condition is satisfied, the condition being dependent on at least one of a 2D misalignment and a time since last 2D/3D registration procedure； when the registration condition is satisfied, select one of the subsequent 2D images； reset the rendering direction to obtain a second rendering direction by performing a 2D/3D registration procedure in respect of the 3D image and the selected 2D image； and regenerate a second rendered image from the 3D image based on the second rendering direction.
