Abstract: A fast moving X-Ray shutter has four independently controlled blades defining a Region of Interest (ROI). The ROI area receives the normal X-Ray dose and is exposed at the machine's X-ray pulse frame rate. The ROI can be automatically controlled based on image contents using computer vision techniques. Periodically the shutter blades retract at a controlled speed, exposing the area outside the ROI to a lower, non-uniform, exposure. The non-uniformity in this background exposure is dynamically corrected by a look-up table. The displayed image is a seamless combination of the ROI image and the corrected background image. The displayed image has slightly lower resolution outside the ROI but better resolution (as compared to standard fluoroscopy practices) in the ROI because of reduced scattering.

Abstract: By exposing the ROI at full exposure and full frame rate while exposing the area outside the ROI with low exposure and up to full frame rate an overall reduction in X-Ray radiation is achieved. The resultant image has slightly lower resolution outside the ROI but better resolution (as compared to standard fluoroscopy practices) in the ROI because of reduced scattering. Different exposures are supplied to different parts of the image by using a fast shutter in conjunction with the exposure control.

Abstract: A bandwidth sharing method for use on respective interstitial connections between on one side a plurality of users and on the other side a common data-link having a shared packet switching device, the method including performing the steps of: monitoring data-link directed bandwidth from each user; maintaining a current sum of the monitored bandwidth; and whenever the current sum exceeds a predetermined data-link bandwidth threshold, reducing current collective data-link directed bandwidth by for substantially each user, comparing the respective user's data-link directed bandwidth with a predetermined data-link bandwidth threshold for the respective user; using an allocation function, selecting at least one user who is exceeding his predetermined data-link bandwidth threshold, and for a predetermined time interval, cutting the connection between each selected at least one user and the shared switching device, so as to restore a current sum of the monitored bandwidth to be not greater than the predet