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Demonstration of iodine K-edge imaging by use of an energy-discrimination X-ray computed tomography system with a cadmium telluride detector

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Abstract

An energy-discrimination K-edge X-ray computed tomography (CT) system is useful for increasing the contrast resolution of a target region by utilizing contrast media. The CT system has a cadmium telluride (CdTe) detector, and a projection curve is obtained by linear scanning with use of the CdTe detector in conjunction with an X-stage. An object is rotated by a rotation step angle with use of a turntable between the linear scans. Thus, CT is carried out by repetition of the linear scanning and the rotation of an object. Penetrating X-ray photons from the object are detected by the CdTe detector, and event signals of X-ray photons are produced with use of charge-sensitive and shaping amplifiers. Both the photon energy and the energy width are selected by use of a multi-channel analyzer, and the number of photons is counted by a counter card. For performing energy discrimination, a low-dose-rate X-ray generator for photon counting was developed; the maximum tube voltage and the minimum tube current were 110 kV and 1.0 μA, respectively. In energy-discrimination CT, the tube voltage and the current were 60 kV and 20.0 μA, respectively, and the X-ray intensity was 0.735 μGy/s at 1.0 m from the source and with a tube voltage of 60 kV. Demonstration of enhanced iodine K-edge X-ray CT was carried out by selection of photons with energies just beyond the iodine K-edge energy of 33.2 keV.

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Acknowledgments

This work was supported by Grants-in-Aid for Scientific Research and Advanced Medical Scientific Research from MECSST, Health and Labor Sciences research grants, grants from the Keiryo Research Foundation, The Promotion and Mutual Aid Corporation for Private Schools of Japan, the Japan Science and Technology Agency, and the New Energy and Industrial Technology Development Organization.

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Authors and Affiliations

  1. Faculty of Software and Information Science, Iwate Prefectural University, 152-52 Sugo, Takizawa, 020-0193, Japan

    Abulajiang Abudurexiti & Masashi Kameda

  2. Department of Physics, Iwate Medical University, 2-1-1 Nishitokuta, Yahaba, 028-3694, Japan

    Eiichi Sato & Purkhet Abderyim

  3. The 3rd Department of Surgery, Toho University School of Medicine, 2-17-6 Ohashi, Meguro-ku, Tokyo, 153-8515, Japan

    Toshiyuki Enomoto & Manabu Watanabe

  4. Department of Electronics and Intelligent Systems, Tohoku Institute of Technology, 35-1 Yagiyama Kasumi-cho, Taihaku-ku, Sendai, 982-8577, Japan

    Keitaro Hitomi

  5. Department of Nutritional Science, Faculty of Applied Bio-science, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo, 156-8502, Japan

    Etsuro Tanaka

  6. Department of Physiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan

    Hidezo Mori

  7. Organization for Hamamatsu Technopolis, Headquarters of Hamamatsu Knowledge Cluster, 2-7-1 Higashiiba, Naka-ku, Hamamatsu, Shizuoka, 432-8036, Japan

    Toshiaki Kawai

  8. Department of Microbiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, 020-0023, Japan

    Kiyomi Takahashi & Shigehiro Sato

  9. Department of Neurosurgery, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, 020-0023, Japan

    Akira Ogawa

  10. Department of Electronics, Faculty of Engineering, Tohoku Gakuin University, 1-13-1 Chuo, Tagajo, Miyagi, 985-8537, Japan

    Jun Onagawa

Authors
  1. Abulajiang Abudurexiti
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  2. Masashi Kameda
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  3. Eiichi Sato
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  4. Purkhet Abderyim
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  5. Toshiyuki Enomoto
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  6. Manabu Watanabe
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  7. Keitaro Hitomi
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  8. Etsuro Tanaka
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  9. Hidezo Mori
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  10. Toshiaki Kawai
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  11. Kiyomi Takahashi
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  12. Shigehiro Sato
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  13. Akira Ogawa
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  14. Jun Onagawa
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Correspondence to Abulajiang Abudurexiti.

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Abudurexiti, A., Kameda, M., Sato, E. et al. Demonstration of iodine K-edge imaging by use of an energy-discrimination X-ray computed tomography system with a cadmium telluride detector. Radiol Phys Technol 3, 127–135 (2010). https://doi.org/10.1007/s12194-010-0088-8

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  • DOI: https://doi.org/10.1007/s12194-010-0088-8

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