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논문 기본 정보

자료유형
학술저널
저자정보
문태준 (원광대학교병원) 김기정 (건국대학교병원) 이혜남 (김상영내과검진센타)
저널정보
대한방사선과학회 방사선기술과학 방사선기술과학 제40권 제2호
발행연도
2017.6
수록면
261 - 267 (7page)
DOI
http://dx.doi.org/10.17946/JRST.2017.40.2.11

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The study has attempted to evaluate and compare the image evaluation and exposure dose by respectively applying filter back projection (FBP), the existing test method, and adaptive statistical iterative reconstruction (ASIR) with different values of tube voltage during the low dose computed tomography (LDCT). With the image reconstruction method as basis, chest phantom was utilized with the FBP and ASIR set at 10%, 20% respectively, and the change of tube voltage (100 kVp, 120 kVp). For image evaluation, back ground noise, signal-noise ratio (SNR) and contrast-noise ratio (CNR) were measured, and, for dose assessment, CTDIvol and DLP were measured respectively. In terms of image evaluation, there was significant difference in ascending aorta (AA) SNR and inpraspinatus muscle (IM) SNR with the different amount of tube voltage (p < 0.05). In terms of CTDIvol, the measured values with the same tube voltage of 120 kVp were 2.6 mGy with no-ASIR and 2.17 mGy with 20%-ASIR respectively, decreased by 0.43 mGy, and the values with 100 kVp were 1.61 mGy with no-ASIR and 1.34 mGy with 20%-ASIR, decreased by 0.27 mGy. In terms of DLP, the measured values with 120 kVp were 103.21 mGy?cm with no-ASIR and 85.94 mGy?cm with 20%-ASIR, decreased by 17.27mGy?cm (about 16.7%), and the values with 100 kVp were 63.84 mGy?cm with no-ASIR and 53.25 mGy?cm with 20%-ASIR, a decrease by 10.62 mGy?cm ( about 16.7%). A t lower tube v oltage, the r ate of d ose significantly decreased, but the negative effects on image evaluation was shown due to the increase of noise.

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