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KMID : 1151820190130050749
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 5 p.749 ~ p.755
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Effects of Tube Voltage and Tube Current on Exposure Index : Focused on Radiographic Images of Cone Pyramid Phantom
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Seoung Youl-Hun
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Abstract
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In this study, we investigated the effects of tube voltage (kVp) and tube current (mAs) on an exposure index (EI) applied to a digital radiography. There used an inverter type digital X-ray generator and an image receptor (IR) utilized a portable wireless detector without a grid. Radiographic images were acquired using a cone pyramid phantom produced using a 3D printer. The X-ray tube voltage was increased from 40 kVp to 120 kVp with 10 kVp increment, and the tube current was increased from 1 mAs to 128 mAs with the twice increment. As a result, kVp had logarithmic relationship with the EI as high R2 value, and mAs had a very high linear relationship too. Also, there was a high correlation between the area dose and the EI of the IR, with the R2 value being 0.76 or more. In conclusion, it had showed that mAs affected the EI linearly, and that it could be advantageous to adjust the easy-to-predict mAs to maintain proper image qualities.
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KEYWORD
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Cone pyramid phantom, Digital radiography, Tube voltage, Tube current, Exposure index
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