X-ray or gamma ray systems or devices – Electronic circuit – With switching means
Patent
1985-07-03
1987-08-04
Howell, Janice A.
X-ray or gamma ray systems or devices
Electronic circuit
With switching means
378115, 378138, H05G 156, H01J 3514
Patent
active
046851186
ABSTRACT:
An X-ray tube having a capability to produce multiple anode spots. The X-ray tube can produce three or more different size anode focal spots without modification of the connectors, cabling, or high voltage supply for routing high voltage signals to the X-ray tube. An isolating fiber optic control input connects an external light emitting diode to a controller inside the tube housing. The controller responds to light signals from the light emitting diode to control the size of focus spots on the tube anode. In a preferred embodiment each of three filaments are individually energized to produce three different size focal spots and a cathode cup to which the filaments are mounted is also biased to add a four spot capability. In an alternate embodiment a split or segmented cathode cup has its segments biased to different electrical potentials by tapping power from a conventional high voltage filament supply used in energizing a cathode filament. Confirmation circuitry monitors operation of the controller and deactivates the X-ray tube in the event of a controller malfunction.
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Burke James E.
Furbee Avery D.
Pleil Viktor W.
Howell Janice A.
Picker International Inc.
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