Application of waist circumference combined with dose index in low dose lumbar CT examination of children
Objective To investigate the feasibility of DRI combined with waist circumference in reducing radiation dose of lumbar CT examination in children.Methods A total of 300 children who underwent lumbar spine CT examination at the Children's Medicine Affiliated to Nanjing Medical University from January 2021 to October 2022 were divided into groups according to their waist circumferences,with a waist circumference of≤45 cm for group A,a waist circumference of 45-50 cm for group B,and a waist circumference of＞50 cm for group C,the children in each group were randomly assigned to different subgroups,each subgroup corresponded to different DRI values,the scanning tube voltage was 100 kV,the DoseRight automatic exposure control technology was used,the iDose4 reconstruction algorithm was used to reconstruct the CT images,and the quality of the images were subjectively and objectively evaluated,and the CTDIVOL and DLP of each group were compared and analyzed.Results When the DRI of group A was 9,group B was 11,and group C was 13,the image quality can meet the minimum diagnostic requirements,the SNR in the intervertebral disc region and the paravertebral muscle region of the three groups increased with the increase of DRI,and the difference was statistically significant(P＜0.01),the CTDIVOL and DLP of the three groups decreased with the decrease of DRI(P＜0.01).Conclusion The combination of DRI and waist circumference can provide guidance for the development of an individualized plan for lumbar CT scan in children.
childrenvolume CT dose indexdose right indexwaist circumference
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