Dual filament X-ray tube used in production of fluoroscopic imag

Details Dual filament X-ray tube used in production of fluoroscopic imag Dual filament X-ray tube used in production of fluoroscopic imag

1977-05-12

1978-08-22

Willis, Davis L.

Radiant energy

Luminophor irradiation

Self-luminous article

315 64, G01N 2322, H01J 744

Patent

active

041091515

ABSTRACT:
Method and apparatus is disclosed for providing a beam of X-radiation having an intensity value which is rapidly switchable between nonzero levels. An X-ray tube having one or more electron-emitting thermionic filaments is provided with cathode bias control circuitry for limiting electron flow between the tube's cathode and anode structures. The bias control circuitry applies one of a plurality of predetermined values of negative potential to a cathode cup structure for allowing predetermined quanta of electrons emitted from an energized filament to reach the anode.
One value of the negative potential bias is a relatively large value for cutting off all flow of electrons; a second or intermediate value of negative voltage bias allows a predetermined fraction of the total quanta of emitted electrons to flow; and a third potential value allows a greater number of electrons to flow. Because the bias potential can be rapidly switched to rapidly change the number of electrons striking the anode, the intensity value of the X-ray beam produced is rapidly switchable. The invention finds particularly advantageous application in fluoroscopic examination systems wherein the radiation level is rapidly switched between a relatively low television level and a relatively high spot camera or cine photographic level.

REFERENCES:
patent: 1660122 (1928-02-01), Greger
patent: 2686884 (1954-08-01), Atlee
Clark, George L., Applied X-Rays, Fourth Edition, McGraw-Hill, 1955, p. 14.
Sears, Francis Weston, Principles of Physics III, 3rd Ed., Addison-Wesley Press, Inc., Cambridge Mass., 1948, pp. 304, 305.
Terman, Frederick Emmons, Radio Engineers Handbook, 1st Ed., McGraw-Hill, 1943, pp. 393, 394.

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