X-radiator with non-migrating focal spot

Details X-radiator with non-migrating focal spot X-radiator with non-migrating focal spot

1988-08-12

1989-04-04

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Source

Electron tube

378138, G01T 120, H01J 3506

Patent

active

048192600

ABSTRACT:
An x-radiator has a rotating anode on which electrons emitted by a thermionic cathode are incident to produce an x-ray beam. The electron stream is incident on the anode at a focal spot. The focal spot on the anode is prevented from migrating laterally from a selected point by a magnetic field generated by a coil acting on the electron stream. The position of the emitted x-ray beam is monitored by a detector, and upon a change in position of the x-ray beam, corresponding to a migration of the focal spot, the detector supplies a signal to a control unit for the coil which adjusts the magnetic field to maintain the electron stream at the desired focal spot.

REFERENCES:
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patent: 2946892 (1960-07-01), Bas-Taymaz
patent: 3250916 (1966-05-01), Rogers
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patent: 4112397 (1978-09-01), Randall
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patent: 4442539 (1984-04-01), Aichinger et al.
patent: 4577340 (1986-03-01), Carlson et al.
patent: 4631744 (1986-12-01), Haberrecker
patent: 4675892 (1987-06-01), Plessis et al.

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