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저선량 CT에서 다양한 촬영기법에 따른 폐결절의 석회화 발견과 음영도 변화의 팬텀 연구
  • Cho Jae Yong
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Advisor
박경주
Affiliation
아주대학교 일반대학원
Department
일반대학원 의학과
Publication Year
2016-02
Publisher
The Graduate School, Ajou University
Keyword
Low-dose chest CTLung phantomLung noduleCT densitometry
Description
학위논문(석사)--아주대학교 일반대학원 :의학과,2016. 2
Alternative Abstract
Purpose : To evaluate the attenuation change of hyperdense lung nodule and diagnostic performance of visual assessment according to various tube voltage and current setting in low-dose CT comparing with standard-dose CT. Material and Methods : A chest phantom containing artificial nodules was scanned with 64-detector-row and 128-detector-row CT scanners using a standard and various low-dose settings with iterative reconstruction. Mean attenuation of nodules and image noise were compared between the standard-dose and low-dose images. Diagnostic accuracy of visual assessment by two readers for discrimination of hyperdense nodule was analyzed using CT images of standard and 5 selected low-dose settings. Results : Mean CT attenuation of nodules was increased with low tube voltage and image noise was increased with low tube voltage and current in both CT scanners. Mean attenuation of some nodules below hyperdense criteria (200 HU) on standard-dose CT was changed to considerably above 200 HU on low tube current and voltage setting. Diagnostic accuracy for discrimination of hyperdense nodule by visual assessment was not different between standard-dose and low-dose CT scans. Inter-observer agreement for grading of hyperdense nodule showed better agreement in higher radiation-dose scans. Conclusion : Low-dose CT maintains the diagnostic accuracy in visual assessment of hyperdense lung nodule despite increased image noise and higher attenuation criteria will be necessary for determining hyperdense nodule using CT densitometry in low-dose setting.
Language
eng
URI
https://dspace.ajou.ac.kr/handle/2018.oak/18829
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Type
Thesis
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