Automatic filament calibration system for x-ray generators

Details Automatic filament calibration system for x-ray generators Automatic filament calibration system for x-ray generators

1990-07-05

1991-12-31

Westin, Edward P.

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

378207, 378109, 378113, 378118, H05G 134, H05G 150

Patent

active

050777734

ABSTRACT:
A voltage control (22) controls the voltage applied between an anode (12) and a cathode filament (14) of an x-ray tube (10). A filament control (16) controls the amount of current fed through the filament. A voltage controlled oscillator (40) and counter (42) monitor the magnitude, if any, of a tube current (24) flowing between the cathode and the anode to generate x-rays (26). A microprocessor (50) calibrates the filament current such that the filament current value stored in a filament current look-up table (122) for each selectable tube voltage and tube current combination actually produces the selected tube current. The filament current is initialized (60) to a small current value and progressively incremented (66) until a commencement of the tube current (24) is monitored (64). To calibrate each selectable tube voltage, tube current combination, the filament current is incremented from this initial current flow or emission point (52) and the resultant tube current is compared (98) with the selected tube current. A substantial portion of the filament current values stored in the filament current look-up table are determined this way and the rest are determined by interpolation (140).

REFERENCES:
patent: 4593371 (1986-06-01), Grajewski

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