1. A method for improving a 3D visualization of both a vascular insert and a vessel anatomy surrounding the insert in a patient using a radiography during a medical intervention procedure, comprising: determining a 2D projection to obtain a first 2D image from a 3D image data set, which includes a view of at least said vessel anatomy of the patient, and which is obtained with a first imaging device prior to the medical intervention procedure, said 2D image containing a view of the vessel anatomy and congruent with a second 2D image obtained with a second imaging device during the intervention procedure, said second 2D image containing a view of the insert and the vessel anatomy surrounding the insert, wherein the view of the insert in the second 2D image has a first-contrast value, wherein a view of the first 2D image has a second-contrast value, wherein the second-contrast value is sufficiently high relative to the first-contrast value to cover the view of the insert when the first and second 2D images are overlaid; overlaying the second 2D image with the first 2D image on a single window display on a monitor, adjusting a cross fading of at least two image parts of the overlaid images, wherein at least one of said at least two image parts contains the view of the insert and the vessel anatomy surrounding the insert, wherein at least another one of said at least two image parts is transparent relative to said at least one of said at least two image parts; manually adjusting a transparency stage of at least one of the overlaid images to provide a blended view of the vessel anatomy surrounding the insert but covering the view of the insert due to the second contrast value of the second 2D image being sufficiently high relative to the first contrast value of the insert in the first 2D image; generating respective cursors linked to said at least two image parts; simultaneously displaying the respective linked cursors on said single window display; spatially shifting within said single window display in response to commands from a user at least one of the two image parts of the overlaid images on said single window display along a first axial direction; arranging the spatial shifting of said at least one of the two image parts of the overlaid images on said single window display to cause a sufficient spatial separation between said at least one of said at least two image parts containing the view of the insert, and said at least another one of said at least two image parts covering the view of the insert so that the view of the insert is no longer covered, said at least two image parts providing respective views of the vessel anatomy surrounding the insert; and using relative movement of the respective cursors displayed on said single window display as a visual cue to the user for performing said spatial shifting, wherein the respective cursors displayed on said single window display are configured to point to an identical position marked in both the shifted and unshifted images and wherein the marked identical position is selected by the user.