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KMID : 1131320160180010041
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Journal of Korean Society of Computed Tomographic Technology
2016 Volume.18 No. 1 p.41 ~ p.46
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The Study of gray-white matter contrast at 80kVp compared to 120kVp in the pediatric brain CT
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Kim Yun-Jae
choi Eun-Young
Goo Hong-Wook
Kim Dong-Seong
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Abstract
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Purpose: We aimed to know whether the 80kVp pediatric brain CT has better gray-white matter contrast compared to 120kVp on the same patients.
Materials and method: Thirty patients at 80kVp of brain CT were compared to 120kVp of prior studies in the same patients. Signal(Hounsfield units[HU]), noise(sd HU), contrast to noise ratio(CNR) and contrast to noise ratio per dose(CNRD) were assessed in the multiple gray and white matter regions of interest.
Result: The average signals(HU) of gray matter at 80kvp and 120kVp were 41.731(95% CI=40.983-42.579) and 35.837(95% CI=35.070-36.559),respectively (p=0.000) and white matter at 80 and 120 were 29.897(95% CI=29.028-30.934) and 27.655(95% CI=27.043- 28.282), respectively(p=0.000). The average noise(sd HU) of gray matter at 80kVp and 120kVp were 4.525(95% CI=4.219-4.911) and 3.757(95% CI=3.529-4.025), respectively(p=0.001) and white matter at 80 and 120 were 4.270(95% CI=3.955-4.585) and 3.560(95% CI=3.348-3.785), respectively(p=0.000). The gray-white matter contrast to noise ratio(CNR) at 80kVp and 120kVp was 2.789(95% CI=2.574-3.021) and 2.376(95% CI=2.145-2.649), respectively(p=0.024) and gray-white matter contrast to noise ratio per dose at 80kVp and 120kVp were 0.573(95% CI=0.518-0.628 ) and 0.476(95% CI=0.422-0.534 ).
Conclusion: The cerebral gray-white matter CNR at 80kVp was increased by 17.4% compared to 120kVp and CNRD was increased by 20.4%. These findings will contribute to pediatric brain CT imaging.
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KEYWORD
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Brain CT, Pediatric, CNR, CNRD
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