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1. A computer tomograph, comprising a static radiator-detector ring, which is constructed from an odd number (n) of radiator-detector elements, of which a single radiator-detector element is displaceable, with opening of the radiator-detector ring, the displaceable radiator-detector element with the remaining radiator-detector elements together defining a C-shape, wherein each radiator-detector element has an anode arrangement provided for the emission of X-rays, which extends over an angle α of at least 0.9×360°/n on a circumference of the radiator-detector ring, and a detector provided for detection of X-ray radiation, which extends within the same radiator-detector element over an angle β of at least 0.95×360°/n, and wherein each anode arrangement is part of a radiator arrangement comprising a plurality of electron emitters, in which each electron emitter is configured, in cooperation with an electrode arrangement, to generate a focal spot at one of at least three selectable positions on the anode arrangement.
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