Dose control by iterative reconstruction combined with axial Scanning and wide body detector in low-dose children CT scanning

ZHAI Yanhui; ZHANG Wenjing; MENG Huiying; ZHANG Min; YANG Chenxiao; NIU Dandan; JIA Shouqiang

doi:10.20258/j.cnki.1006-9011.2025.01.016

Abstract：objective This research intended to investigate the application value of iterative reconstruction(ASiR-V)com-bined with axial scanning and wide body detector in dose control for low-dose children CT scanning.Methods 120 preschool children were prospectively enrolled in this study.The patients were randomly divided into four groups.The control group was set to group A,the ASiR-V weight was set to 0%(FBP),the experimental group was set to group B,C,D,and the ASiR-V weight was set to 20%,40%and 60%respectively.The children in four groups were scanned by 16 cm detector axis,voltage 100 kVp,automatic tube current setting range 10-600 mA,rotation speed 0.28 s/rot,noise index 12,and scanning layer thickness 5 mm.Dose Length Product(DLP)values were recorded,and the standard deviation(SD,image noise)values of each patient's image were measured with the mediastinal window aorta.The differences of DLP and SD were compared by single factor ANOVA.Sub-jective image quality was evaluated blindly using a 5-point scoring method.Results The DLP values of group A,B,C,D were(30.16±13.75),(21.33±8.19),(16.41±6.66),(10.26±4.60)mGy·cm,and the SD values were(9.92±1.31)HU,(9.79±1.21)HU,(9.55±1.34)HU,(9.47±0.85)HU.There were significant differences in DLP between any two groups(P<0.05).Compared with imaging of ASiR-V 0,as the increase of ASiR-V,the reduction percentage of DLP was 29.28%,45.59%and 65.98%,respectively.There were no significant differences in SD and subjective score between any two groups(P>0.05).Con-clusion The new function of iterative reconstruction dose control was used in chest CT examination of preschool children.ASiR-V weight change did not affect image quality(SD),but the radiation dose could be significantly reduced.