体型因素及组织成分对成人胸部CT水当量直径的体型特异性剂量估算的影响OA

Objective:To investigate the impact of individual body size factors and tissue composition on the size-specific dose estimate(SSDEWED)based on water equivalent diameter for adult chest.Methods:A total of 205 adult subjects who underwent chest CT scans at our hospital were enrolled,and their individual information(height,weight,body mass index)was collected.The average CTROI value,cross-sectional area AROI,right left diameter,and anteroposterior diameter of the thorax on the axial images at the intermediate level were collected.The fat content,fat volume,muscle content,and muscle volume across the entire scanning range were recorded.The anteroposterior diameter/right left diameter,scan length,and scan length/right left diameter were calculated.The volume CT dose index(CTDIvol)of the subjects was obtained,and the SSDEWED values at the mid-level of all subjects were calculated.The correlations between fat content,muscle content,fat volume,muscle volume,BMI,cross-sectional ares AROI,right left diameter,anteroposterior diameter,scan length,scan length/right left diameter ratio,anteroposterior diameter/right left diameter ratio,and SSDEWED were analyzed.Results:Fat content,fat volume,muscle volume,BMI,cross-sectional AROI,right left diameter,anteroposterior diameter,scan length/right left diameter ratio are significantly positively correlated with SSDEWED.Muscle content,anteroposterior/right left diameter ratio,and scan length showed no correlation with SSDEWED.Conclusion:Multiple individual body size factors and tissue compositions are significantly correlated with SSDEWED,among which adipose tissue is the key factor influencing SSDEWED.