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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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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- Demonstration of iodine K-edge imaging by use of an energy-discrimination X-ray computed tomography system with a cadmium telluride detector
Radiological Physics and Technology
Volume 3, Issue 2 , pp 127-135
- Cover Date
- Print ISSN
- Online ISSN
- Springer Japan
- Additional Links
- X-ray CT
- CdTe detector
- Photon counting
- Energy discrimination
- Iodine K-edge CT
- Author Affiliations
- 1. Faculty of Software and Information Science, Iwate Prefectural University, 152-52 Sugo, Takizawa, 020-0193, Japan
- 2. Department of Physics, Iwate Medical University, 2-1-1 Nishitokuta, Yahaba, 028-3694, Japan
- 3. The 3rd Department of Surgery, Toho University School of Medicine, 2-17-6 Ohashi, Meguro-ku, Tokyo, 153-8515, Japan
- 4. Department of Electronics and Intelligent Systems, Tohoku Institute of Technology, 35-1 Yagiyama Kasumi-cho, Taihaku-ku, Sendai, 982-8577, Japan
- 5. Department of Nutritional Science, Faculty of Applied Bio-science, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo, 156-8502, Japan
- 6. Department of Physiology, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan
- 7. Organization for Hamamatsu Technopolis, Headquarters of Hamamatsu Knowledge Cluster, 2-7-1 Higashiiba, Naka-ku, Hamamatsu, Shizuoka, 432-8036, Japan
- 8. Department of Microbiology, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, 020-0023, Japan
- 9. Department of Neurosurgery, School of Medicine, Iwate Medical University, 19-1 Uchimaru, Morioka, 020-0023, Japan
- 10. Department of Electronics, Faculty of Engineering, Tohoku Gakuin University, 1-13-1 Chuo, Tagajo, Miyagi, 985-8537, Japan