Objective To evaluate the accuracy of the fetal weight estimation system in terms of estimating the fetal weight.Methods The fetal weight estimation system developed by the Department of Electronic Engineering,Fudan University was applied to estimate the fetal weight in many hospitals,and the differences between the estimated results of the system and the actual weight of newborn fetuses,as well as the accuracy of the estimation system and the traditional estimation methods were compared.Results A total number of 610 cases were employed,with each case including the ultrasound images of fetus before birth,the corresponding measurement data and the newborn weight.The correlation coefficients between the weight of the newborn babies and the fetal parameters,which were measured by the estimation system in terms of the biparietal diameter,the head circumference,the abdomen circumference and the femur length,were higher than those obtained by manual annotations,with improvements of 0.08,0.17,0.09 and 0.05,respectively.The absolute error of the estimated weight of the system with respect to the actual weight was 44 g smaller than those estimated by traditional method,and the variance of the absolute error was 53 g smaller;while the corresponding absolute percentage error was 1.8％ lower,and the corresponding variance percentage was 1.5％ lower.Conclusions The fetal weight estimation system improves the accuracy of the prenatal ultrasound assessment and provides reliable information to clinical diagnosis.

Objective:To establish a practical and systematic pre-deployment base-based training course for medical units in peacekeeping level-II hospitals.Methods:We surveyed the current status of pre-deployment training of medical teams in peacekeeping level-II hospitals, and organized expert discussions to preliminarily construct centralized training course contents. At the same time, the Delphi method was used to conduct two rounds of questionnaire-based consultation to evaluate the overall framework design of the course and the rationality and importance scores of each module. The contents of the pre-deployment training course were further selected and optimized based on the positive coefficient (%), authority coefficient (Cr), coefficient of concordance ( W), and coefficient of variation (Cv). Results:The contents of the pre-deployment training course for the medical units of peacekeeping level-II hospitals were preliminarily established. The experts scored high for the combat onsite first-aid skills module [rationality score, (9.32±0.75) points; importance score, (9.45±0.65) points] and the combat wound treatment module [rationality score, (9.33±0.75) points; importance score, (9.28±0.74) points], and scored lowest for the field survival module [rationality score, (7.95±2.28) points; importance score, (7.87±2.16) points].Conclusions:The established contents of the pre-deployment base-based training course for the medical units of peacekeeping level-II hospitals are reasonable and practical, which lays the foundation for perfecting the pre-deployment training system of peacekeeping medical teams.

Objective: To observe the root and root canal morphology of mandibular second molars in Western Guangxi by CBCT, to provide a reference for clinical diagnosis and treatment. Methods: In total, 564 patients′ 1 128 mandibular second molars that satisfy the inclusion criteria were analyzed with a planmecaromexis CBCT machine and its own image analysis software. The patients′ gender, age and ethnic differences in the root and canal morphology and the symmetry of the bilateral root and canal were statistically analyzed. Results: Among the 1 128 mandibular second molars, 662 were the Zhuang ethnic group and 384 were the Han ethnic group, and 82 were other ethnic groups; the double root type and C-shaped root type accounted for a relatively high proportion: 73.94% and 24.47%, respectively. The detection rates of the double root type were higher in males than in females (P < 0.05); the detection rates of the C-shaped root type were higher in females than in males (P <0.05); the root type of the teeth was mainly double-rooted in the Zhuang ethnic group (P<0.01). The incidence of type IV in the mesial root of the double root type mandibular second molar was the highest (P < 0.01), and the incidence of type I in the distal root was the highest (P < 0.01). The C-shaped root canal is more continuous at the mouth of the root canal, more downward corresponds to a worse continuity: in three different levels of root canal orifice, root middle and root apex, the root canal orifice is dominated by the C1 type, and both root middle and root apex are mainly C3-type (P < 0.01). The difference in symmetry of bilateral roots and root canals was statistically significant among different gender groups, age groups, and ethnic groups (P < 0.05): there were more males than females, the results in the 18-35-year-old group and the Zhuang ethnic group were higher. Conclusion The root and root canal morphology of mandibular second molars in western Guangxi people are complex and changeable. The roots are mainly double root type in the Han ethnic group and the Zhuang ethnic group. C-shaped roots are also common. The detection rate of C-shaped roots in the Zhuang ethnic group was higher, and the symmetry rate of bilateral roots and that of bilateral root canals was higher in the Zhuang ethnic group than in the Han ethnic group.