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Proceedings Paper

High-speed soft x-ray generators in biomedicine
Author(s): Eiichi Sato; Michiaki Sagae; Kei Takahashi; Teiji Oizumi; Hidenori Ojima; Kazuyoshi Takayama; Yoshiharu Takayama; Toru Yanagisawa; Akihiro Fujiwara; Kanji Mitoya
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Paper Abstract

The constructions and the fundamental studies of high-speed soft x-ray generators which can be used for performing biomedical radiography with maximum photon energies of less than 150 keV are described. The flash x- ray generators having cold-cathode radiation tubes are classified to four types: (1) high-intensity single flash x-ray generators, (2) dual- energy flash x-ray generators, (3) single plasma flash x-ray generators, and (4) repetitive compact flash x-ray generators. In general, when we employed flash x-ray generators with diodes, the pulse widths had values of less than 200 ns. In the case where we employed a long-duration flash x-ray generator having a triode, the width could be increased up to about 40 microsecond(s) . The maximum tube currents achieved with high-intensity generators were more than 10 kA, and the maximum repetition rate of a compact generator has a value of about 0.4 kHz. In order to obtain higher repetition rates of more than 1 kHz, we developed three types of pulsed x-ray generators having hot-cathode tubes as follows: (5) a 30 kHz high-dose-rate generator, (6) a 30 kHz variable-duration microsecond generator, and (7) two 10 kHz high-photon-energy generators. When a high-dose-rate generator was employed, the maximum tube current can be increased up to about 2 A by applying the positive grid voltage. In contrast, as the duration was controlled in a microsecond range by using a microsecond generator, the sufficient x-ray intensities for the normal radiography were obtained. The maximum photon energy could be increased more than 100 keV using a high-voltage transformer in conjunction with a diode. Using these generators, we performed various kinds of high- speed soft radiographies.

Paper Details

Date Published: 30 May 1995
PDF: 19 pages
Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); doi: 10.1117/12.209662
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Michiaki Sagae, Iwate Medical Univ. (Japan)
Kei Takahashi, Iwate Medical Univ. (Japan)
Teiji Oizumi, Iwate Medical Univ. (Japan)
Hidenori Ojima, Tohoku Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)
Yoshiharu Takayama, Iwate Medical Univ. (Japan)
Toru Yanagisawa, Iwate Medical Univ. (Japan)
Akihiro Fujiwara, Japan Mechaelectric Inc. (Japan)
Kanji Mitoya, Japan Mechaelectric Inc. (Japan)


Published in SPIE Proceedings Vol. 2513:
21st International Congress on: High-Speed Photography and Photonics
Ung Kim; Joon-Sung Chang; Seung-Han Park, Editor(s)

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