Article

Radiological Physics and Technology

, Volume 3, Issue 2, pp 127-135

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

  • Abulajiang AbudurexitiAffiliated withFaculty of Software and Information Science, Iwate Prefectural University Email author 
  • , Masashi KamedaAffiliated withFaculty of Software and Information Science, Iwate Prefectural University
  • , Eiichi SatoAffiliated withDepartment of Physics, Iwate Medical University
  • , Purkhet AbderyimAffiliated withDepartment of Physics, Iwate Medical University
  • , Toshiyuki EnomotoAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Manabu WatanabeAffiliated withThe 3rd Department of Surgery, Toho University School of Medicine
  • , Keitaro HitomiAffiliated withDepartment of Electronics and Intelligent Systems, Tohoku Institute of Technology
  • , Etsuro TanakaAffiliated withDepartment of Nutritional Science, Faculty of Applied Bio-science, Tokyo University of Agriculture
  • , Hidezo MoriAffiliated withDepartment of Physiology, Tokai University School of Medicine
    • , Toshiaki KawaiAffiliated withOrganization for Hamamatsu Technopolis, Headquarters of Hamamatsu Knowledge Cluster
    • , Kiyomi TakahashiAffiliated withDepartment of Microbiology, School of Medicine, Iwate Medical University
    • , Shigehiro SatoAffiliated withDepartment of Microbiology, School of Medicine, Iwate Medical University
    • , Akira OgawaAffiliated withDepartment of Neurosurgery, School of Medicine, Iwate Medical University
    • , Jun OnagawaAffiliated withFaculty of Software and Information Science, Iwate Prefectural UniversityDepartment of Electronics, Faculty of Engineering, Tohoku Gakuin University

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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.

Keywords

X-ray CT CdTe detector Photon counting Energy discrimination Iodine K-edge CT