| 摘要 |
A method and apparatus for improving skin line viewing in a medical X-ray diagnostic system having an X-ray source (50) for generating a scanning X-ray beam (52) to image a target (60). In one form, the apparatus includes a first collimator (58) positioned in the X-ray beam and having a rectangular shaped slit (56) for passing the beam. A second collimator (120L, R) is positioned adjacent the first collimator and includes a plurality of spaced attenuation plates which can be moved over the slit (56) in the first collimator. The attenuation plates (120L, 120R) are angled and tapered with respect to the slit. Control means (72, 126, 128) is provided for locating the target within the slit and continuously driving the second collimator attenuation plates so as to intersect the edge of the target aligned with the slit. |
