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 IJMPCERO  Vol.7 No.3 , August 2018
Enhanced K-Edge Radiography Using a High-Spatial-Resolution Cadmium Telluride Array Detector
Abstract: To confirm the imaging effect of a dual-energy (DE) cadmium telluride (CdTe) array detector (XCounter, Actaeon) and to perform fundamental studies on DE computed tomography, we performed enhanced K-edge radiography using iodine (I) and gadolinium (Gd) media. DE radiography was performed using an X-ray generator with a 0.1-mm-diam-focus tube and a 0.5-mm-thick beryllium window, a 1.0-mm-thick aluminum filter for absorbing extremely low-energy photons, and the CdTe array detector with pixel dimensions of 0.1 × 0.1 mm2. Each pixel has a charge-sensitive amplifier and a dual-energy counter, and the event pulses from the amplifier are sent to the counter to determine two threshold energies. The tube current was a maximum value of 0.50 mA, and the tube voltages for I- and Gd-K-edge radiograms were 60 and 80 kV, respectively. In the I-K-edge radiography of a dog-heart phantom at an energy range of 33 - 60 keV, the muscle density increased, and fine coronary arteries were visible. Utilizing Gd-K-edge radiography of a rabbit head phantom at an energy range of 50 - 80 keV, the muscle density increased, and fine blood vessels in the nose were observed at high contrasts. Using the DE array detector, we confirmed the image-contrast variations with changes in the threshold energy.
Cite this paper: Watanabe, M. , Sato, E. , Oda, Y. , Moriyama, H. , Hagiwara, O. , Matsukiyo, H. , Enomoto, T. and Kusachi, S. (2018) Enhanced K-Edge Radiography Using a High-Spatial-Resolution Cadmium Telluride Array Detector. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 7, 296-307. doi: 10.4236/ijmpcero.2018.73024.
References

[1]   Mori, H., Hyodo, K., Tanaka, E., Uddin-Mohammed, M., Yamakawa, A., Shinozaki, Y., Nakazawa, H., Tanaka, Y., Sekka, T., Iwata, Y., Handa, S., Umetani, K., Ueki, H., Yokoyama, T., Tanioka, K., Kubota, M., Hosaka, H., Ishikawa, N. and Ando, M. (1996) Small-Vessel Radiography in Situ with Monochromatic Synchrotron Radiation. Radiology, 201, 173-177.
https://www.ncbi.nlm.nih.gov/pubmed/8816540
https://doi.org/10.1148/radiology.201.1.8816540


[2]   Hyodo, K., Ando, M., Oku, Y., Yamamoto, S., Takeda, T., Itai, Y., Ohtsuka, S., Sugishita, Y. and Tada, J. (1998) Development of a Two-Dimensional Imaging System for Clinical Applications of Intravenous Coronary Angiography Using Intense Synchrotron Radiation Produced by a Multipole Wiggler. Journal of Synchrotron Radiation, 5, 1123-1126.
https://www.ncbi.nlm.nih.gov/pubmed/15263766
https://doi.org/10.1107/S0909049597017639


[3]   Sato, E., Tanaka, E., Mori, H., Kawai, T., Ichimaru, T., Sato, S., Takayama, K. and Ido, H. (2004) Demonstration of Enhanced K-Edge Angiography Using a Cerium Target X-Ray Generator. Medical Physics, 31, 3017-3022.
https://www.ncbi.nlm.nih.gov/pubmed/15587654
https://doi.org/10.1118/1.1803433


[4]   Watanabe, M., Sato, E., Abderyim, P., Abudurexiti, A., Hagiwara, O., Matsukiyo, H., Osawa, A., Enomoto, T., Nagao, J., Sato, S., Ogawa, A. and Onagawa, J. (2011) First Demonstration of 10 keV-Width Energy-Discrimination K-Edge Radiography Using a Cadmium-Telluride X-Ray Camera with a Tungsten-Target Tube. Nuclear Instruments and Methods in Physics Research Section A, 637, 171-177.
http://www.sciencedirect.com/science/article/pii/S0168900211004098

[5]   Yanbe, Y., Sato, E., Chiba, H., Maeda, T., Matsushita, R., Oda, Y., Hagiwara, O., Matsukiyo, H., Osawa, A., Enomoto, T., Watanabe, M., Kusachi, S., Sato, S. and Ogawa, A. (2013) High-Sensitivity High-Speed X-Ray Fluorescence Scanning Cadmium Telluride Detector for Deep-Portion Cancer Diagnosis Utilizing Tungsten-Kα-Excited Gadolinium Mapping. Japanese Journal of Applied Physics, 52, 092201-1-4.
http://iopscience.iop.org/article/10.7567/JJAP.52.092201/meta
https://doi.org/10.7567/JJAP.52.092201


[6]   Hagiwara, O., Sato, E., Watanabe, M., Sato, Y., Oda, Y., Matsukiyo, H., Osawa, A., Enomoto, T., Kusachi, S. and Ehara, S. (2014) Investigation of Dual-Energy X-Ray Photon Counting Using a Cadmium Telluride Detector and Two Comparators and Its Application to Photon-Count Energy Subtraction. Japanese Journal of Applied Physics, 53, 102202-1-6.
http://iopscience.iop.org/article/10.7567/JJAP.53.102202
https://doi.org/10.7567/JJAP.53.102202


[7]   Sato, E., Kosuge, Y., Yamanome, H., Mikata, A., Miura, T., Oda, Y., Ishii, T., Hagiwara, O., Matsukiyo, H., Watanabe, M. and Kusachi, S. (2017) Investigation of Dual-Energy X-Ray Photon Counting Using a Cadmium Telluride Detector with Dual-Energy Selection Electronics. Radiation Physics and Chemistry, 130, 385-390.
https://www.sciencedirect.com/science/article/pii/S0969806X1630367X
https://doi.org/10.1016/j.radphyschem.2016.09.018


[8]   Matsukiyo, H., Sato, E., Oda, Y., Ishii, T., Yamaguchi, S., Sato, Y., Hagiwara, O., Enomoto, T., Watanabe, M. and Kusachi, S. (2017) Investigation of Quad-Energy Photon Counting for X-Ray Computed Tomography Using a Cadmium Telluride Detector. Applied Radiation and Isotopes, 130, 54-59.
https://www.sciencedirect.com/science/article/pii/S0969804317305146
https://doi.org/10.1016/j.apradiso.2017.09.011


[9]   Feuerlein, S., Roessl, E., Proksa, R., Martens, G., Klass, O., Jeltsch, M., Rasche, V., Brambs, H.J., Hoffmann, M.H.K. and Schlomka, J.P. (2008) Multienergy Photon-Counting K-Edge Imaging: Potential for Improved Luminal Depiction in Vascular Imaging. Radiology, 249, 1010-1016.
http://pubs.rsna.org/doi/abs/10.1148/radiol.2492080560
https://doi.org/10.1148/radiol.2492080560


[10]   Ogawa, K., Kobayashi, T., Kaibuki, F., Yamakawa, T., Nanano, T., Hashimoto, D. and Nagaoka, H. (2012) Development of an Energy-Binned Photon-Counting Detector for X-Ray and Gamma-Ray Imaging. Nuclear Instruments and Methods in Physics Research Section A, 664, 29-37.
http://www.sciencedirect.com/science/article/pii/S0168900211018997
https://doi.org/10.1016/j.nima.2011.10.009


[11]   Zscherpel, U., Walter, D., Redmer, B., Ewert, U., Ullberg, C., Weber, N. and Pantsar, T. (2014) Digital Radiology with Photon Counting Detectors. Proceedings of 11th European Conference on Non-Destructive Testing, Prague, 6-10 October 2014, 1-8.
http://www.ndt.net/events/ECNDT2014/app/content/Paper/461_Zscherpel.pdf

[12]   Osawa, A., Watanabe, M., Sato, E., Matsukiyo, H., Enomoto, T., Nagao, J., Abderyim, P., Aizawa, K., Tanaka, E., Mori, H., Kawai, T., Ogawa, A., Takahashi, K., Sato, S. and Onagawa, J. (2010) Magnification Embossed Radiography Utilizing Image-Shifting Subtraction Program. Japanese Journal of Applied Physics, 49, 037001-1-7.
http://iopscience.iop.org/article/10.1143/JJAP.49.037001
https://doi.org/10.1143/JJAP.49.037001


 
 
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