Siemens Aktiengesellschaft

Klaus Baeker

Heribert Amtmann

In the exemplary embodiments the path of movement of the photographic exposure unit comprised of an x-ray tube and image layer (or film) carrier can be selected. For determination of the photographic exposure time, either an mAs-relay or an automatic exposure timer with a radiation detector may be placed in control of the energization of the x-ray tube. The x-ray tube current or the current of the radiation detector are integrated and the integrator contents are sampled at a predetermined time following commencement of the photographic exposure. The sampled value is compared with a reference value and the running speed of the photographic exposure unit is influenced in such a fashion that the photographic exposure time determined by the switching of the mAs-relay or by the automatic exposure timer approximately corresponds to the running time of the photographic exposure unit.

X-ray diagnostic system comprising tomographic apparatus

In an exemplary embodiment, a circuit arrangement is present for the purpose of storage of information which corresponds to the switch-off phase angle of the supply voltage and for the purpose of switching-on at a phase position of the supply voltage which is equal to the respectively stored phase angle. In order to take into account the delay time between a switch-on signal and the actual switching-on of the high voltage transformer, two time systems are present, operating in relative displacement by the amount of the delay time, which time systems recognize the respective phase position of the supply voltage and cooperate with the memory as well as with a comparator, where the phase position present at the switch-off time is stored taking into account the delay time. The comparator delivers enabling signals for the switching-on of the high voltage transformer when the supply voltage reaches the switch-off-phase position which is pre-displaced by the amount of the delay time.

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Uttenreuth, Germany

Klaus Baeker