CAT scanner
 A CAT (computerized axial tomography) scanner having a lightweight rotary portion. The scanner has slip rings through which electric power is supplied to an x-ray tube. The slip rings do not need any special insulating mechanism. The scanner includes an inverter (3) for converting a line voltage into an AC voltage between the line voltage and a high voltage applied to the x-ray tube. The frequency of the AC voltage is between the frequency of the line voltage and radio frequencies. This AC voltage is supplied via the slip rings to the rotary portion and then stepped up and rectified by step-up tanks (7, 8) on the rotary portion to obtain the high DC voltage applied to the x-ray tube. 
Yokogawa Medical Systems, Limited
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H05G H05G H05G A61B
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Ryo Hitoshi
Takahashi Yamada