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http://dx.doi.org/10.7742/jksr.2019.13.7.969

Usefulness of Dual Energy CT to Improve Image Quality Degradation due to Lens Shielding  

Yoon, Joon (Department of Radiologic Technology, Dongnam Health University)
Kim, Hyeonju (Department of Radiologic Technology, Dongnam Health University)
Publication Information
Journal of the Korean Society of Radiology / v.13, no.7, 2019 , pp. 969-977 More about this Journal
Abstract
Applying the bismuth shield used to reduce the radiation exposure, image quality may be reduced due to beam hardening caused by the shield during CT scan. Therefore, we tried to find out the energy range that can reduce image degradation by applying GSI mode of G company's dual energy CT and examine the possibility through experiment. As a result, after bismuth shielding, 118 ± 10.6 HU and 50.1 ± 14.6 HU at 50 keV after dual-energy CT scan were the most similar to the CT value before image deterioration(p> 0.05). It was measured 176.6 ± 7.1 and 138.3 ± 1.1 at 50 keV(p> 0.05). Experiments showed that the use of the shield during CT inspection inevitably degrades the image quality, but experiments show that the GSI function of the dual energy CT can maintain the image quality even when the shield is used. If the various shields are secured after the evaluation using the dual energy CT, it is expected to overcome the disadvantages of poor image quality caused by the use of the radiation shield for reducing the exposure, which is the biggest disadvantage of the CT scan.
Keywords
Radiation shielding; Bismuth; Image quality; Dual energy CT;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 M. Joshi, S. Aluri, K. Procknow, D. A. Langan, D. S. Sahani . "Effective atomic number accuracy for kidney stone characterization using spectral CT," The International Society for Optical Engineering, Vol. 7622, No. 5, pp. 76223 - 76223, 2010.
2 D. Prell, W. A. Kalender, Y. Kyriakou, "Development implementation and evaluation of a dedicated metal artifact reduction method for interventional flat -detector CT. British Journal of Radiology Vol. 83. No. 996, pp. 1052-1062, 2010.   DOI
3 M. Y. Jung, D. C. Kwon, S. I. Kwon, "Effectiveness of bismuth shield to reduce eye lens radiation dose using the photoluminescence dosimetry in computed tomography," journal of Korean Society Radiological Technologists, Vol. 32, No. 3, pp. 307-312, 2009.
4 H. Hricak, D. J. Brenner, S. J. Adelstein, D. P. Frush, E. J. Hall, RW Howell, "Managing radiation use in medical imaging: a multifaceted challenge," Journal of Radiology, Vol. 258, No. 3, pp. 889-905, 2011.   DOI
5 F. A. Mettler Jr, M. Bhargavan, K. Faulkner, D. B. Gilley, J. E. Gray, G. S. Ibbott, "Radiologic and nuclear medicine studies in the United States and worldwide: frequency, radiation dose, and comparison with other radiation sources 1950-2007," Journal of Radiology Vol. 253 No. 2, pp. 520-531, 2009.   DOI
6 European Commission. "European guidelines on quality criteria for computed tomography," (EUR 16262 EN). Luxembourg, Luxembourg: European Commission, 2000.
7 S. C. Han, Y. E. Chung, Y. H. Lee, K. K. Park, M. J. Kim, "Metal Artifact Reduction Software Used With Abdominal pelvic Dual-Energy CT of Patients With Metal Hip Prostheses: Assessment of Image Quality and Clinical Feasibility", American Journal of Roentgenology. Vol. 203 No. 4 pp. 788-795, 2014.   DOI
8 Y. G. Kwak, C. Y. Kim, S. P. Jeong "Research on Dose Reduction During Computed Tomography Scanning by CARE kV System and Bismuth" The Journal of the Korea Contents Association, Vol. 14, No. 8, pp. 233-242, 2014.   DOI
9 H. J. Kim, J. Yoon "Analysis of the artifact reduction rate for the types of medical metals in CT with MAR algorithm", Journal of Korean Academia-Industrial cooperation Society, Vol. 17, No. 9, pp. 655-662, 2016.
10 International Commission on Radiological Protection: Managing Patient Dose in computed tomography, in Ann ICRP 2000, Pergamon Oxford, 2000.
11 Yu, Lifeng, "Radiation dose reduction in computed tomography: techniques and future perspective." Imaging in medicine, Vol. 1. No. 1, pp. 65-84, 2009.   DOI
12 J. T. Payne, "CT radiation dose and image quality," Radiologic clinics of North America, Vol. 43 No. 6, pp. 953-962, 2005.   DOI
13 H. S. Lim, K, H, Kim, M, K, Kim, Computed Tomography, publish of Academia Vol. 1, No. 2, pp 29-31, 2010.
14 C. L. Brown, R. P. Hartman, O. P. Dzyubak, i N. Takahash, A. Kawashima, C. H. McCollough, M. R. Bruesewitz, A. M. Primak, J. G. .Fletcher " Dual-energy CT iodine overlay technique for characterization of renal masses as cyst or solid a phantom feasibility study", European Journal of Radiology Vol. 19, No. 5, pp. 1289-1295, 2009.   DOI