A computer-implemented method for displaying a 3D model of a patient in a 3D scene, each voxel of the displayed 3D model being associated to a respective pixel of at least one corresponding cross-sectional image of the patient, the 3D scene further including a cursor and at least one display window. The method includes the steps of: computing a current position of the cursor in a scene coordinate system of the 3D scene based on a current position of a user point in user coordinate system; and for each active display window of the at least one display window, displaying a displayed image based on the cross-sectional image, which includes a pixel associated to the voxel that is the closest to the computed current position of the cursor and which has a corresponding image cross-section plane that matches a window cross-section plane of the active display window.