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KMID : 1131320140160020015
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Journal of Korean Society of Computed Tomographic Technology
2014 Volume.16 No. 2 p.15 ~ p.24
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Evaluation of Image Noise and Radiation Dose Analysis InScreening Asymptomatic Normal Lung Disease using DoseModulation
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Kim Ki-Jeong
Seong Dong-Chan
Lim Woo-Teak
Kim Do-Yun
Kim Sun-Bae
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Abstract
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Purpose : Lung disease in clinical screening of asymptomatic during normal use of the low dose chest CT protocol(Fixed mAs) and Dose Modulation protocols were compared between dose and image quality.
Materials & Method : Thoracic low-dose protocol(2012) and Dose Modulation protocol(2013) and inspection(BrillianceTM CT 64 Slice, PHILIPS)was targeted by the same 40 people, autoorities of the mediastinal branch location images were used for this study. Subjects werefourgroupsaccording toBMI(underweight, normal weight, overweight, obese) weredivided,and visibleunder therootof the ascending aortaand the noisewas measuredin theCT number. Back-ground noise by measuring the signal-to-noise ratio (signal-to-noise ratio. SNR), and contrast-to-noise ratio (contrast-to-noise ratio. CNR) was determined.CTDIVOL dose and DLP values from the two protocols were measured, and statistical analysis program SPSS (version 17.0) were analyzed.
Result : CTDIVOL Dose Modulation is applied to the 29.3% DLP has had a 32.5% reduction in dose. Quality assessment of noise and SNR in the underweight group and the normal weight group, but significant differences, significant differences toward overweight and obese, respectively.CNR in the four groups did not show significant differences. Compare the two images of each group in the body mass increased SNR and CNR were significantly higher noise. Dose Modulation in the group had at least one difference.
Conclusion : Dose Modulation protocols are significantly lower dose than the low dose protocol, approximately 30% of the dose was reduced.Quality assessment in the underweight group and the normal weight group did not show significant differences, toward overweight and obese increases the noise was significantly different.
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KEYWORD
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Low dose CT , Body mass index , Dose , Signal-to-noise ratio , Contrast-to-noise ratio
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