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KMID : 1149020190210020041
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 2 p.41 ~ p.48
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Effectiveness Evaluation about the Volume Reduction of Contrast Media and Radiation Dose with 100 kVp in Abdomen-Pelvis CT
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Choi Jun-Young
Kim Mi-Hyeon
Kim Seong-Il
Lee Ki-Baek
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Abstract
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In CT examination, many hospitals attempt to reduce radiation dose in various ways. One of those methods is to use lower tube voltage. This method can decrease radiation dose and also increase the enhancement of iodine-containing vascular, parenchymal organs. However, This leads to degrading image quality by increasing noise, so we have to find a reasonable point. To hold the merit as mentioned above, We tried to reduce the tube voltage from 120 kVp to 100 kVp and quantity of Contrast medium. Thus, The pupose of this study is to find out how much this changes can reduce the radiation dose, amount of contrast medium and maintain the image quality. we gathered data of 1200 patients who underwent Abdomen Pelvis CT with Somatom Definition Edge from February to August 2017. 600 patients of them were applied 100 kVp, the rest were applied 120 kVp. we divided into three groups by A(<60 kg), B(60 kg≤x＜70 kg), C(≤70 kg) in same kVp groups, and measured the radiation dose, CT number and noise. Then we evaluated the quantitative image quality and radiation dose. DLP and CTDIvol of 100 kVp were about 40% less than 120 kVp regardless of weight. Overall quality of images with 100 kVp were higher than 120 kVp. Usage of 100 kVp can reduce not only the amount of Contrast Medium, but also radiation dose about 40% without degrading image quality using the IR method.So Usage of 100 kVp in abdominal pelvis CT is recommended.
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KEYWORD
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Abdomen Pelvis CT, low tube voltage, radiation dose, iterative reconstruction, contrast media reduction
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