Abstract: Power supplies for supplying medical systems in hospitals must be designed to accommodate a demanding range of requirements. The instantaneous power demand from modern CT systems can reach hundreds of kilo Watts. Dimensioning a hospital utility power system to provide this instantaneous power level is expensive. The usage pattern of medical systems in hospitals means that the instantaneous power is required only for a low duty cycle, with an average power demand of such a system being at least one order of magnitude lower. Therefore, the present application proposes a multifunctional power distribution system, with a charging mode, an operation mode, a backup mode, and a bypass mode. In the operating mode, the average power level may be supplied from the utility mains, but the relatively infrequent peak power demands may be provided from an electrical energy storage element, which is charged by the utility mains supply.

Abstract: The radiation applied to an object (input dose rate) during irradiation of the object by a radiation source (1) is limited during X-ray exposures. Pairs of values of a control curve which give rise to an input dose rate on the object to be examined which exceeds a predetermined maximum input dose rate are corrected by an arithmetic unit (76). This results in a corrected control curve whose entire length can be used for adjusting the desired tube parameters (tube voltage, tube current or load) without giving rise to the risk of exceeding the maximum input dose rate.

Abstract: The invention relates to a method and a device for limiting radiation applied to an object (input dose rate) during irradiation of the object by means of a radiation source (1), notably during X-ray exposures. Pairs of values of a control curve which give rise to an input dose rate on the object to be examined which exceeds a predetermined maximum input dose rate are corrected by means of a calculated factor. This results in a corrected control curve whose entire length can be used for adjusting the desired tube parameters (tube voltage, tube current or load) without giving rise to the risk of exceeding the maximum input dose rate.