Abstract: An X-ray source comprises a cold cathode and an anode. The cold cathode has a curved emission surface capable of emitting electrons. The anode is spaced apart from the cathode. The anode is capable of emitting X-rays in response to being bombarded with electrons emitted from the curved emission surface of the cathode.

Abstract: With the objective of preventing variations in sensitivity even if samples to be inserted between an upper coil and a lower coil opposite to each other are different in body frame, a pre-scan is effected on a sample in a state in which the sample is placed in a space defined between the upper coil and the lower coil, and reflected waves sent from the coils are detected by a directional coupler. Further, a comparison controller controls an attenuator so that the voltages of the reflected waves are equalized. Afterwards, a main scan is carried out.

Abstract: A system for managing replacement of x-ray tubes, such as in medical diagnostic systems, includes circuitry for monitoring operating parameters of the x-ray tubes, and circuitry for analyzing the monitored parameters and scheduling for tube replacement based upon predicted failure. The scheduling circuitry may be located in a remote service center and is linked to the diagnostic systems via a network connection. A failure prediction circuit may be located at the remote service center or local to the diagnostic system. Upon identifying a predicted tube failure, replacement of the tube is scheduled and shipment of a replacement tube is ordered. Service personnel may be notified automatically to coordinate tube replacement. Electronic messages may be transmitted to the service personnel and to personnel in the facility where the x-ray tube is installed to notify all parties of the scheduled tube replacement.