21 September 2005 Enhanced K-edge plasma angiography achieved with tungsten Kα rays utilizing gadolinium-based contrast media
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Abstract
The tungsten plasma flash x-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because Kα rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash x-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash x-rays are produced by the discharging. The x-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-voltage pulse generator employs a cable transmission line, the high-voltage pulse generator produces twice the potential of the condenser charging voltage. At a charging voltage of 80 kV, the estimated maximum tube voltage and current were approximately 160 kV and 40 kA, respectively. When the charging voltage was increased, the characteristic x-ray intensities of tungsten Kα lines increased. Using an ytterbium oxide filter, the Kα lines were clean, and hardly any Kβ lines and bremsstrahlung rays were detected. The x-ray pulse widths were approximately 60 ns, and the time-integrated x-ray intensity had a value of approximately 50 μGy at 1.0 m from the x-ray source with a charging voltage of 80 kV. Angiography was performed using a film-less computed radiography system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.
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Eiichi Sato, Eiichi Sato, Yasuomi Hayasi, Yasuomi Hayasi, Rudolf Germer, Rudolf Germer, Koji Kimura, Koji Kimura, Etsuro Tanaka, Etsuro Tanaka, Hidezo Mori, Hidezo Mori, Toshiaki Kawai, Toshiaki Kawai, Takashi Inoue, Takashi Inoue, Akira Ogawa, Akira Ogawa, Shigehiro Sato, Shigehiro Sato, Kazuyoshi Takayama, Kazuyoshi Takayama, Hideaki Ido, Hideaki Ido, } "Enhanced K-edge plasma angiography achieved with tungsten Kα rays utilizing gadolinium-based contrast media", Proc. SPIE 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications, 592012 (21 September 2005); doi: 10.1117/12.620212; https://doi.org/10.1117/12.620212
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