摘要：Objective: To evaluate whether neck circumference (NC) is an appropriate somatometric parameter for determining tube voltage of thorax CT under automatic exposure control (AEC) system in comparison with BMI. Methods: 76 patients undergoing non-enhanced thorax CT were enrolled in this study. NC, body weight and height were measured and body mass index (BMI) was calculated before the examination. The subjective image quality was assessed using on a 5-point scale. Results: There were high correlations between BMI, NC, and weight. There were also high correlations between these three somatometric parameters and dose. The correlation between NC and dose (r = 0.839) is higher than the correlation between BMI and dose (r = 0.635). Conclusion: It might be more accurate to determine the tube voltage of thorax CT under AEC system according to NC value as NC is correlated in dose changes more accurately and with a higher proportion instead of BMI.
关键词：ındividual dose control; computed tomography; ALARA; tube voltage; neck circumference; body mass index
