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KMID : 1151820190130070969
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 7 p.969 ~ p.977
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Usefulness of Dual Energy CT to Improve Image Quality Degradation due to Lens Shielding
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Yoon Joon
Kim Hyeon-Ju
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Abstract
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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.
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KEYWORD
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Radiation shielding, Bismuth, Image quality, Dual energy CT
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