Enhanced k-edge angiography utilizing a super-fluorescent x-ray generator with a gadolinium-target tube

Eiichi Sato; Rudolf Germer; Haruo Obara; Etsuro Tanaka; Hidezo Mori; Toshiaki Kawai; Takashi Inoue; Akira Ogawa; Shigehiro Sato; Kazuyoshi Takayama

doi:10.1117/12.725174

11 January 2007 Enhanced k-edge angiography utilizing a superfluorescent x-ray generator with a gadolinium-target tube

Eiichi Sato, Rudolf Germer, Haruo Obara, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama

Author Affiliations +

Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 627911 (2007) https://doi.org/10.1117/12.725174
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China

Abstract

The gadolinium plasma flash x-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic x-rays from the gadolinium target are absorbed effectively by iodine-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 cold-cathode 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 are approximately 160 kV and 40 kA, respectively. When the charging voltage was increased, the K-series characteristic x-ray intensities of gadolinium increased. Bremsstrahlung x-ray intensity rate decreased with increasing the charging voltage, and clean K lines were produced with a charging voltage of 80 kV. The x-ray pulse widths were approximately 100 ns, and the time-integrated x-ray intensity had a value of approximately 500 μGy at 1.0 m from the x-ray source with a charging voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and iodine-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

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Eiichi Sato, Rudolf Germer, Haruo Obara, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, and Kazuyoshi Takayama "Enhanced k-edge angiography utilizing a superfluorescent x-ray generator with a gadolinium-target tube", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 627911 (11 January 2007); https://doi.org/10.1117/12.725174

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