Abstract: In a method and apparatus to detect position changes of an implant x-ray detectable markers are arranged in the environment of the implant, and 2D x-ray exposures are obtained at temporal intervals of a region containing the implant in which a distribution of the markers as well as of marked points of the implant are visible in each 2D x-ray exposure. A first of the 2D x-ray exposures is obtained at a first point in time from one projection direction, and a second of the 2D x-ray exposures is obtained at a second point in time from another projection direction. The distribution of the markers and marked points is determined in the first and second 2D x-ray exposure by an evaluation device, and from the distributions a degree of probability is calculated that the distribution of the first 2D x-ray exposure and the distribution of the second 2D x-ray exposure are projections of the same three-dimensional distribution of markers and marked points.

Abstract: An apparatus for processing cassettes which contain exposed photographic roll films has an inclined chute the upper part of which receives successive loaded cassettes in predetermined orientation by way of a duct when a first turnable gate between the duct and the chute is held in open position. The first gate can seal an inlet opening at the upper end of an antechamber which is adjacent to the upper part of the chute and is dimensioned to receive one casette at a time. The outlet opening at the lower end of the antechamber can be sealed by a second turnable gate which, when moved to the open position (simultaneously with movement of the first gate to closed position or vice versa), allows a loaded cassette to descend onto a third turnable gate and to assume an optimum position for removal of exposed photographic film therefrom. When the third gate is moved to open position, it allows an empty cassette to pass through a conduit and into a collecting receptacle.