X-ray reference channel and x-ray control circuit for ring tube

Details X-ray reference channel and x-ray control circuit for ring tube X-ray reference channel and x-ray control circuit for ring tube

1994-04-08

1995-12-12

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378108, 378134, 378138, H01J 3504

Patent

active

054757290

ABSTRACT:
A toroidal x-ray tube (I) is supported and selectively positioned by a gantry (II). The x-ray tube includes a toroidal housing (A) in which a rotor (30) is rotatably mounted. One or more cathodes (C) are mounted on the rotor for generating an electron beam which strikes an anode (B) to generate a beam of x-rays which passes through a window (20) and strikes an annular ring of detectors (160). A grid bias control circuit (100) selectively applies a continuously adjustable bias to a grid (36) for regulating the electron current, hence the intensity of the x-ray beam. A scintillating optical fiber (110) extends around the exterior of the window. The scintillation optical fiber includes fluorescent dopant (116) which convert a very small fraction of the x-rays into optical light which is transmitted along the fibers to an opto-electric transducer (118). The opto-electric transducer is connected with the grid bias control circuit. The opto-electrical transducer (118) can also be connected with an intensity compensator (162) for adjusting the signals from the detector ring before they are reconstructed (164 ) into an image representation.

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"Scintillating Optical Fibers", Bicron Corporation Advertising Brochure, pp. 1-6 No date.

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