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

Abulajiang Abudurexiti, Masashi Kameda, Eiichi Sato, Purkhet Abderyim, Toshiyuki Enomoto, Manabu Watanabe, Keitaro Hitomi, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Kiyomi Takahashi, Shigehiro Sato, Akira Ogawa, Jun Onagawa

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalRadiological Physics and Technology
Volume3
Issue number2
DOIs
Publication statusPublished - 2010 Jul 1

Keywords

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

ASJC Scopus subject areas

  • Radiation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Radiology Nuclear Medicine and imaging

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