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Triple-energy high-count-rate X-ray computed tomography scanner using a cadmium telluride detector

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Abstract

To obtain three kinds of tomograms at three different X-ray energy ranges simultaneously, we have constructed a triple-energy (TE) X-ray photon counter with a cadmium telluride (CdTe) detector and three sets of comparators and microcomputers (MCs). X-ray photons are detected using the CdTe detector, and the event pulses produced using amplifiers are sent to three comparators simultaneously to regulate three threshold energies of 15, 33, and 50 keV. Using this counter, the energy ranges are 15–33, 33–50 and 50–100 keV; the maximum energy corresponds to the tube voltage. We performed TE computed tomography (TE-CT) at a tube voltage of 100 kV. Using a 0.5-mm-diam lead pinhole, three tomograms were obtained simultaneously. K-edge CT using iodine and gadolinium media was carried out utilizing two energy ranges of 33–50 and 50–100 keV, respectively. At a tube voltage of 100 kV and a current of 130 μA, the count rate was 33 kilocounts per second (kcps), and the minimum count rates after penetrating objects in TE-CT were regulated to approximately 2 kcps by the tube current.

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Acknowledgments

This work was supported by Grants from Promotion and Mutual Aid Corporation for Private Schools of Japan, Japan Science and Technology Agency (JST), and JSPS KAKENHI (17 K10371, 17 K09068, 17 K01424, 17H00607). This was also supported by a Grant-in-Aid for Strategic Medical Science Research (S1491001, 2014–2018) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

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

    Eiichi Sato, Tsukuru Sato & Yasuyuki Oda

  2. Central Radiation Department, Iwate Medical University Hospital, 19-1 Uchimaru, Morioka, Iwate, 020-0023, Japan

    Yuichi Sato

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

    Sohei Yoshida & Satoshi Yamaguchi

  4. Department of Surgery, Toho University Ohashi Medical Center, 2-17-6 Ohashi, Meguro, Tokyo, 153-8515, Japan

    Osahiko Hagiwara, Hiroshi Matsukiyo, Toshiyuki Enomoto, Manabu Watanabe & Shinya Kusachi

Authors
  1. Eiichi Sato
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  2. Tsukuru Sato
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  3. Yasuyuki Oda
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  4. Yuichi Sato
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  5. Sohei Yoshida
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  6. Satoshi Yamaguchi
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  7. Osahiko Hagiwara
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  8. Hiroshi Matsukiyo
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  9. Toshiyuki Enomoto
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  10. Manabu Watanabe
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  11. Shinya Kusachi
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Correspondence to Eiichi Sato.

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Sato, E., Sato, T., Oda, Y. et al. Triple-energy high-count-rate X-ray computed tomography scanner using a cadmium telluride detector. Health Technol. 8, 197–203 (2018). https://doi.org/10.1007/s12553-018-0236-4

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  • DOI: https://doi.org/10.1007/s12553-018-0236-4

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