X-ray diagnostic generator in which the x-ray tube voltage is re

Details X-ray diagnostic generator in which the x-ray tube voltage is re X-ray diagnostic generator in which the x-ray tube voltage is re

1978-11-09

1980-03-04

Church, Craig E.

Radiant energy

With charged particle beam deflection or focussing

With target means

250409, H05G 130_

Patent

active

041918916

ABSTRACT:
In an exemplary embodiment, the control circuit for controlling filament current to maintain x-ray tube voltage at a set point value is disabled near the beginning of an x-ray exposure by the cut-off of filament current to provide a falling load characteristic as a function of time. During the cooling of the x-ray tube filament, the x-ray tube voltage is maintained near its set point value by the timed switching of taps of a variable-ratio transformer to change the input voltage to the x-ray tube high voltage transformer, and by the coordinated changing of the loading of the primary circuit of such high voltage transformer, the control circuit for maintaining x-ray tube voltage at the set point value thereafter being placed in control of the filament current for the remainder of the x-ray exposure.

REFERENCES:
patent: 3846633 (1974-11-01), Romandi
patent: 3939352 (1976-02-01), Mester

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