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Optical Engineering

K-edge magnification digital angiography using a 100-um-focus tungsten tube
Author(s): Eiichi Sato; Etsuro Tanaka; Hidezo Mori; Hiroki Kawakami; Toshiaki Kawai; Takashi Inoue; Akira Ogawa; Mitsuru Izumisawa; Kiyomi Takahashi; Shigehiro Sato; Kazuyoshi Takayama
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Paper Abstract

A microfocus x-ray tube is useful to perform magnification digital radiography, including phase-contrast effects. The 100-m-focus x-ray generator consists of a main controller for regulating the tube voltage and current, and a tube unit with a high-voltage circuit and a fixed anode x-ray tube. The maximum tube voltage, current, and electric power are 105 kV, 0.5 mA, and 50 W, respectively. Using a 3-mm-thick aluminum filter, the x-ray intensity is 26.0 Gy/s at 1.0 m from the source, with a tube voltage of 60 kV and a current of 0.50 mA. Because the peak photon energy is approximately 35 keV using the filter with a tube voltage of 60 kV, the bremsstrahlung x-rays are absorbed effectively by iodine-based contrast media with an iodine K-edge of 33.2 keV. Magnification angiography is performed by three-fold magnification imaging with a computed radiography sys-tem using iodine-based microspheres 15 m in diameter. In angiography of nonliving animals, we observe fine blood vessels approximately 100 m with high contrasts.

Paper Details

Date Published: 1 February 2007
PDF: 6 pages
Opt. Eng. 46(2) 026503 doi: 10.1117/1.2542285
Published in: Optical Engineering Volume 46, Issue 2
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Etsuro Tanaka, Tokyo Univ. of Agriculture and Technology (Japan)
Hidezo Mori, National Cardiovascular Ctr. Research Institute (Japan)
Hiroki Kawakami, Hamamatsu Corp. (United States)
Toshiaki Kawai, Hamamatsu Photonics K.K. (Japan)
Takashi Inoue, Iwate Medical Univ. (Japan)
Akira Ogawa, Iwate Medical Univ. (Japan)
Mitsuru Izumisawa, Iwate Medical Univ. (Japan)
Kiyomi Takahashi, Iwate Medical Univ. (Japan)
Shigehiro Sato, Iwate Medical Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)

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