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| Applied research of iterative reconstruction technique in the low-dose chest CT scans of children |
| XU Lei1, XIONG Shan2, CHENG Jianmin1, ZHENG Li3, XU Xin1. |
1.Department of Radiology, the Sceond Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325027; 2.Department of Radiology, Jingzhou Central Hospital, Jingzhou, 434020; 3.Department of Neonatology, Jingzhou Central Hospital, Jingzhou, 434020
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| Cite this article: |
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XU Lei,XIONG Shan,CHENG Jianmin, et al. Applied research of iterative reconstruction technique in the low-dose chest CT scans of children[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2016, 46(10): 716-719.
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Abstract Objective: To explore the feasibility of low tube current combined with iDose4 iterative reconstruction technique in the low-dose chest CT scans of children. Methods: Eight-eight children continuously underwent routine chest CT scan were divided into two groups using conventional dose (50 mAs) and low dose (25 mAs) scan, respectively. Routine dose group underwent filtered back projection (FBP) reconstruction, record as group A, low dose group was performed FBP, iDose4-1, iDose4-3, iDose4-5 iteration reconstruction (IR), and so referred to as group B, C, D, E. Measured and calculated CT value, noise, signal to noise ratio of each group images in order to evaluate the quality of the images objectively; quality of images was assessed according to five levels rating method by two diagnostic radiology physicians of deputy chief physician title; recorded volume CT dose index (CTDIVOL) and dose length product (DLP) provided by CT scanner dose reports, and calculated the effective dose (ED). Subjective and objective images quality and radiation dose were statistically analyzed. Results: Compared with routine dose group, effective dose (ED) of low dose group decreased by 52%. Subjective and objective quality of images of group B, the worst quality of low dose groups, was less than that of routine dose group (P<0.05), subjective and objective quality of images of group C was less than that of routine dose group (P<0.05), no significant statistical difference was existed between group D and group A in subjective and objective quality of images (P>0.05), subjective and objective quality of images of group E was better than that of group A (P<0.05). Conclusion: When low-dose chest CT scans of children are taking, 25 mAs tube current combined with iDose4-3 iterative reconstruction technique can obtain the same quality of images as routine dose group, while the radiation dose is reduced by 52%.
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Received: 04 November 2015
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