Preliminary investigation of adult CT diagnostic reference levels in selected institutions in Qingdao City,China
Objective To provide data base for the development of X-ray computed tomography(CT)diagnostic refer-ence levels suitable for the physical characteristics of residents in Qingdao City,China.Methods A total of 3351 cases of adult CT scan data derived from 14 devices were randomly selected from three tertiary hospitals and one primary hospital from January 1 to December 31,2022.CT examination was performed on the brain,paranasal sinus,neck,chest,abdomen,cervical vertebrae,and lumbar vertebrae.The cases also included CT angiography(CTA)data on the brain,neck artery,pul-monary artery,and aorta.The data types included tube voltage(kV),effective tube current(mAs),computed tomography dose index volume(CTDIvol),and dose length product(DLP).The 1st,2nd,3rd quartile values of CTDIvol and DLP were calculated.Results Large differences were observed in DLP among different body parts of adults.The DLP value showed a descending order of craniocerebral CTA,craniocerebral CT,abdomen CT,lumbar vertebral spiral CT,aorta CTA,pulmon-ary artery CTA,paranasal sinus CT,chest CT,cervical vertebral spiral CT,and neck CT.The 3rd quartile DLP values of the brain and neck were 657.9 and 228.1 mGy·cm,respectively.The CTDIvol of the brain was largest(3rd quartile,52.0 mGy)and the CTDIvol of the chest was smallest(3rd quartile,8.2 mGy).Conclusion There are significant differences in CT-DIvol and DLP between different body parts of adults in Qingdao City,and CT radiation dose levels are relatively low com-pared to other regions in China and other countries.
CT diagnostic reference levelComputed tomography dose index volumeDose length product
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