| 摘要 |
An electronic video camera apparatus (100) is provided for focusing light rays from object plane (112) proximate image intensifier of a medical x-ray imaging system onto an image plane (114) proximate a light sensor (110). The electronic video camera (100) includes a lens system (120, 124) located between the object and image planes to focus light rays from the object plane (112) onto the image plane (114). The light rays at the object plane (112) are representative of a patient image. An optical filter (144) is located between the object and image planes (112, 114) and partially blocks light rays passing there through. The optical filter (144) includes at least first and second filter regions (192, 200, 202) having different opacity. The first and second filter regions (192, 200, 202) are alignable with the lens system (120, 124) at different times to block differing first and second amounts of light rays, respectively, associated with differing first and second x-ray amounts transmitted at different times. <IMAGE> <IMAGE> |
