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24 September 2007 High-dose-rate pulse x-ray detection using a multipixel photon counter
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Detection of high-dose-rate pulse x-rays from a samarium plasma flash x-ray generator utilizing a multipixel photon counter is described. Monochromatic K-series characteristic x-rays are detected by a plastic scintillator, and fluorescent lights are lead to the photon counter through a 10-m-length plastic fiber. The reverse bias was 70.0 V, and x-ray outputs were recorded by a digital storage scope. The samarium 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 samarium 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. 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 samarium increased. Bremsstrahlung x-ray intensity rate decreased with increasing the charging voltage, and 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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eiichi Sato, Keitaro Hitomi, Seiichiro Nomiya, Hideaki Onabe, Tadayoshi Shoji, Etsuro Tanaka, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, and Kazuyoshi Takayama "High-dose-rate pulse x-ray detection using a multipixel photon counter", Proc. SPIE 6707, Penetrating Radiation Systems and Applications VIII, 67070X (24 September 2007);


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