Picker International, Inc.

John S Ramos

Carl F Bauer

Avery D Furbee

An x-ray tube is disclosed whose cathode cup is battery biased at a low level, approximately 30 volts DC, to inhibit 'wings' on the focal spot of electrons bombarding the anode. The battery for providing bias, floats at the DC electrical potential applied to the cathode, many KV below ground potential. Geometric modifications to the filament/focusing cup arrangement are also included. The geometrical characteristics partially inhibit the dispersion of electrons, inhibiting the formation of 'wings' on the x-ray focal spot, particularly at high current levels. At lower current levels, the low DC battery bias enhances the anti-dispersion effects of the geometrical characteristics to inhibit wing formation even at these lower current levels.

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Buffalo Grove, IL, United States of America

John S Ramos