Energy-discriminating gadolinium K-edge X-ray computed tomography system

Hiroshi Matsukiyo, Manabu Watanabe, Eiichi Sato, Akihiro Osawa, Toshiyuki Enomoto, Jiro Nagao, Purkhet Abderyim, Katsuo AIzawa, Keitaro Hitomi, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Akira Ogawa, Kiyomi Takahashi, Shigehiro Sato, Jun Onagawa

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25 Citations (Scopus)


An energy-discriminating K-edge X-ray computed tomography (CT) system is useful for increasing the contrast resolution of a target region utilizing contrast media and for reducing the absorbed dose for patients. The CT system is of the first-generation type of detector using cadmium telluride (CdTe). CT is performed by repeated translations and rotations of an object. Penetrating X-ray photons from the object are detected by a CdTe detector, and event signals of X-ray photons are produced using charge-sensitive and shaping amplifiers. Both photon energy and energy width are selected out using a multichannel analyzer, and the number of photons is counted by a countercard. To perform energy discrimination, a low-dose-rate X-ray generator for photon counting was developed. Its maximum tube voltage and minimum tube current were 110kV and 1mA, respectively. In energy-discriminating CT, the tube voltage and tube current were 100kV and 20mA, respectively, and the X-ray intensity was 2.98μGy/s at a distance of 1.0 m from the source and a tube voltage of 100 kV. The demonstration of enhanced gadolinium K-edge X-ray CT was carried out by selecting photons with energies just beyond the gadolinium K-edge energy of 50.3 keV.

Original languageEnglish
Article number027001
JournalJapanese journal of applied physics
Issue number2 Part 1
Publication statusPublished - 2010 Feb 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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