Patent ID: 8473869

Claim:
A method, comprising: displaying an X-ray computed tomography image on a screen with a first image contrast; positioning a movable object relative to the screen, detecting a spatial position of a movable object that does not touch the screen relative to the screen, where the spatial position includes two coordinates (x, y) on the screen and a distance (z) from the screen; selecting a region on the screen based, at least in part, on the spatial position of the movable object relative to the screen, where the region includes the two coordinates (x, y) and the X-ray computed tomography image; determining a second image contrast for the X-ray computed tomography image in the selected region in dependence on the distance (z) of the movable object from the screen, wherein the second image contrast is determined based, at least in part, on a mean value computed from the region; and displaying the X-ray computed tomography image with the second image contrast.