mathematical models for teenagers living age evaluation based on ct image of medial clavicular epiphysis objective to explore the correlation between volume rendering vr statistics of medial clavicular epiphysis and living age and establish the mathematical models for living age evaluation using the ct image of medial clavicular epiphysis based on the growth rules of osteoepiphysis of medial claviclemethods the ct images of the medial clavicles from 795 teenagers aged 1525 387 males and 408 females were collected in east and south china vr 3d images were reconstructed from 060 mmthick slice ct images the epiphyseal diameter sternal end diameter and their respective diameter ratio the left x1 the right x3 epiphyseal area sternal end area and their respective area ratio the left x2 the right x4 were measured and calculated all these observations were analyzed using spss 190 statistical software the statistical differences in gender and age were analyzed by mannwhitney u test the mathematical models were established using least square sixty trained subjects 30 males and 30 females were tested to verify the accuracy of the established mathematical modelsresults in the group of same age x1 showed significant difference in gender the same results were observed in x2 x3 and x4 which suggested that the growth rules of osteoepiphysis of medial clavicle were highly correlated with living age the accuracy of these mathematical models were all above 676 10 year and 785 15 yearconclusion the mathematical models with reasonable accuracy could be manageable in practice to confirm the conclusion of the atlas method the current study can contribute to the single skeletal age evaluation