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Proceedings Paper

Very Small Focal Spot Tube And Its Clinical Application
Author(s): Shinji TAKAHASHI
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Paper Abstract

For high magnification radiography very small focal spot tube should be used. In 1953 we reconstructed the usual fixed anode tube (Toshiba Sealex, 10 kW) so that the potential of the focusing cup became lower than that of the heating fil ent by inserting resistence of 70 ka into the circuit containing the focusing cup and the heating filament. The electron beam e itted from the heating filament was biased and the focal spot of 0.15 mm in size was obtained. The elbow joint or the lung of the adult was roentgenograph ed in 2 or 3 times magnification(1). This type of X-ray tube has been developed step by step and at present 0.1 or 0.05 mm grid biased focal spot tube is available in Japan (Table 1).

Paper Details

Date Published: 1 May 1974
PDF: 5 pages
Proc. SPIE 0056, Medical X-Ray Photo-Optical Systems Evaluation, (1 May 1974); doi: 10.1117/12.954282
Show Author Affiliations
Shinji TAKAHASHI, Hamamatsu Univ. (Japan)


Published in SPIE Proceedings Vol. 0056:
Medical X-Ray Photo-Optical Systems Evaluation
David J. Goodenough; Robert F. Wagner; Kenneth E. Weaver, Editor(s)

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