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KMID : 1151820170110070663
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Journal of the Korean Society of Radiology
2017 Volume.11 No. 7 p.663 ~ p.669
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A Study for Effects of Image Quality due to Scatter Ray produced by Increasing of Tube Voltage
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Park Ji-Koon
Jun Jae-Hoon
Yang Seung-Woo
Kim Kyo-Tae
Choi Il-Hong
Kang Sang-Sik
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Abstract
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In diagnostic medical imaging, it is essential to reduce the scattered radiation for the high medical image quality and low patient dose. Therefore, in this study, the influence of the scattered radiation on medical images was analyzed as the tube voltage increases. For this purpose, ANSI chest phantom was used to measure the scattering ratio, and the scattering effect on the image quality was investigated by RMS evaluation, RSD and NPS analysis. It was found that the scattering ratio with increasing x-ray tube voltage gradually increased to 48.8% at 73 kV tube voltage and to 80.1% at 93 kV tube voltage. As a result of RMS analysis for evaluating the image quality, RMS value according to increase of tube voltage was increased, resulting in low image quality. Also, the NPS value at 2.5 lp/mm spatial frequency was increased by 20% when the tube voltage was increased by 93 kV compared to the tube voltage of 73 kV. From this study, it can be seen that the scattering radiation have a significant effect on the image quality according to the increase of x-ray tube voltage. The results of this study can be used as basic data for the improvement of medical imaging quality.
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KEYWORD
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Scattering Ray, Tube voltage, ANSI chest phantom, RMS, RSD, NPS
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