Mathematical models of the teenager's skeletal age evaluation based on CT scan and imaging reconstruction of medial clavicular epiphysis / 法医学杂志

OBJECTIVE@#To explore the correlation between CT volume rendering (VR) statistics and living age and to build the mathematical models for skeletal age evaluation based on the growth rules of medial clavicular epiphysis of teenagers in China.@*METHODS@#The thin layer CT scan and VR 3D imaging reconstruction of both sides of sternal ends of clavicles were examined for 684 teenagers aged from 15 to 25 in East and South China. The parameters of sternal end of clavicle including the longest diameter of epiphysis, the longest diameter of metaphysis, their length radio, area of epiphysis, area of metaphysic, their area ratio, and other data were measured and calculated in order to establish mathematical models of skeletal age evaluation. Fifty trained subjects were tested to verify the accuracy of the mathematical models.@*RESULTS@#In the same age group, the length ratio and the area ratio had significant difference in genders (P < 0.05). The established mathematical models showed that the growth rules of medial clavicular epiphysis were highly correlated with the living ages. The accuracies of these models were higher than 70.5% +/- 1.0 year) and 82.5% (+/- 1.5 year).@*CONCLUSION@#The mathematical models have easy operability and high accuracy. It can be used to confirm and sustain the conclusion of atlas method. Meanwhile, it is of great significance to study the other single skeletal age evaluation in the future.

Mathematical models for teenager's living age evaluation based on CT image of medial clavicular epiphysis / 法医学杂志

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 clavicle.@*METHODS@#The CT images of the medial clavicles from 795 teenagers aged 15-25, 387 males and 408 females, were collected in East and South China. VR 3D images were reconstructed from 0.60 mm-thick 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 19.0 statistical software. The statistical differences in gender and age were analyzed by Mann-Whitney 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 models.@*RESULTS@#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 67.6% (+/- 1.0 year) and 78.5% (+/- 1.5 year).@*CONCLUSION@#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.

The staging method of sternal end of clavicle epiphyseal growth by thin layer CT scan and imaging reconstruction / 法医学杂志

OBJECTIVE@#To establish a CT staging method of sternal end of clavicle epiphyseal growth for teenagers by thin layer CT scan, multiplanar reconstruction (MPR) and volume reconstruction (VR) technologies.@*METHODS@#The CT imaging characteristics, which collected from 460 teenagers (aged from 15 to 25) in East and South China, were studied through both sternal ends of clavicles' imagings by thin layer coronal CT scan and axial CT scan, MPR and VR technologies. The parameters of sternal end of clavicle including the longest diameter of epiphysis, the longest diameter of metaphysis, their length ratio, area of epiphysis, area of metaphysis, and their area ratio were measured and calculated in order to establish new classification.@*RESULTS@#Based on the staging method of Schmeling, integrating the CT imaging reconstruction information of sternal end of clavicle, the new classification of sternal end of clavicle epiphyseal growth were divided into 1 to 5 stages, and stage 2 and stage 3, respectively, contained a, b and c sub-classification.@*CONCLUSION@#This new classification has merits of large sample size, wide age range and easy operability. By using CT imaging reconstruction techniques and analyzing the data which closely related to sternal end of clavicle epiphyseal growth of teenagers, the feasibility of the staging method could be increased.

Progress in thin layer CT scan technology in estimating skeletal age of sternal end of clavicle / 法医学杂志

It is practical value for determination the teenagers whether the age is full of the legal responsibility age of 18 years old or not by estimating skeletal age of sternal end of clavicle. The traditional methods mainly based on X-ray radiography. However, sternal end of clavicle and adjacent lung, bronchus, sternum, rib, transverse process of thoracic vertebra are overlapped each other. As a result of overlapping, there will be obtained false negative or positive film reading results when according to X-ray observation of epiphyseal growth of sternal end of clavicle, which directly affect the scientificalness and accuracy of estimating of skeletal age. In recent years, the scholars at home and abroad have started to use thin layer CT scan technology to estimate skeletal age of the sternal end of clavicle. With the 2D and 3D CT recombination technology, the accuracy of the film reading distinctly improves by making the shape, size and position of epiphysis displayed clearly. This article reviews the application and research progress of thin layer CT scanning technology in estimating skeletal age of sternal end of clavicle at home and abroad, analyzes the superiority and value of thin layer CT scan technology, which applied to skeletal age of sternal end of clavicle.

Long-term trend of bone development in the contemporary teenagers of Chinese Han nationality / 法医学杂志

OBJECTIVE@#To further improve the accuracy of bone age identification using the time of secondary ossification center appearance and epiphyseal fusion of 7 joints to estimate the age of living individuals.@*METHODS@#DR films were taken from 7 parts including sternal end of clavical and the left side of shoulder, elbow, carpal, hip, knee and ankle joints of 1 709 individuals who came from eastern China, central China and southern China, whose ages were between 11.0 and 20.0 years. From those 7 joints 24 osteal loci were selected as bone age indexes, which could better reflect age growth of teenagers. The characteristics of secondary ossification center appearance and epiphyseal fusion were observed, and the mean and age range of secondary ossification center appearance and epiphyseal fusion were calculated.@*RESULTS@#The fusion time of the 24 epiphyses were advanced at different degrees, the most obvious epiphyses the sternal end of clavicle, scapular acromial end, distal end of the radius, distal end of the ulna, iliac crest, ischial tuberosity, the upper and lower end of tibia and fibula. The appearance time of sternal end of clavicle, scapular acromial end, iliac crest and ischial tuberosity epiphyses were all found to be after the age of 12, and the female's age, approximately 1 year ahead of schedule in comparison with the male's.@*CONCLUSION@#The relevant forensic information and data for bone age identification should be updated every 10-15 years so as to provide accurate and objective evidence for court testimony, conviction and sentencing.

Skeletal age estimation of sternal end of clavicle in Sichuan Han nationality youth using thin-section computed tomography / 法医学杂志

OBJECTIVE@#To explore the growth status of epiphysis of sternal end of clavicle using thin-section computed tomography (CT) and to study the relationship between the status and the chronological age of Sichuan Han nationality youth.@*METHODS@#According to the Schmeling's report and the age range of our samples, the ossification status of medial clavicle epiphysis was classified as four stages. CT films of 565 patients between 15 and 25 years were studied based on the classification and analyzed statistically.@*RESULTS@#There was no statistical difference between the sexes (P > 0.05). The calculated empiric distribution function showed that 100% of stage 1 patients were under 18 years, 75% of stage 2 patients were under 18 years, 94.5% of stage 3 patients were over 18 years, and 100% of the stage 4 patients were over 20 years, respectively.@*CONCLUSION@#The ossification of medial epiphysis of the clavicle for those around 18 years has certain regular. These characteristics can be used for forensic identification of the skeletal age, especially 18 years, which is the criminal responsibility age.