BACKGROUND:Studies have shown that pathological change of substantia nigra (SN) is the main reason for Parkinson's disease (PD).From the medical imaging,spatial location,size and 3D morphology analysis of the tiny SN structure are very important to PD's diagnosis and treatment evaluation.As the physiology of rhesus monkey is much similar to human's,it has been used as an ideal experiment subject in many scientific researches.OBJECTIVE:To modify traditional shape-based interpolation method for SN structure of the rhesus monkey brain slices.METHODS:To gain the middle layers between two slices,traditional shape-based interpolation used linear weighted mean algorithm.However,considering the impact of adjacent multi-layer to the image,the middle layers were obtained by non-linear weight.RESULTS AND CONCLUSION:The new interpolation algorithm was assessed with a favorable results.Also,this method was applied to the 3D reconstruction of SN structure.The results show that the new interpolation method can be used in nucleus group interpolation with sparse slices and tiny structures,and offer reference to the related disease research.

Objective:To explore influence on physical development of children aged 18 months from HIV-positive mothers for prevention mother to child transmission of HIV (PMTCT) in Guangxi Zhuang autonomous region, and provide evidence for the improvement PMTCT program.Methods:This retrospective case control study was conducted in 554 HIV negative infants aged 18 months whose HIV positive mothers had received PMTCT services reported through PMTCT system database from January 1, 2010 to December 31, 2017 and 1 109 healthy infants born in 2017, whose mothers were healthy, in Lingshan, Luzhai, and Hengxian counties, ranking top three counties with high HIV infection prevalence, in Guangxi. PMTCT data and physical development data such as height, weight and head circumference of children aged 18 months were collected. The physical dysplasia in the infants was defined as at least one of the three main indicators of height, weight and head circumference below the normal range.Results:The number of HIV-positive mother and their infants in the case group were 667 and 554 respectively, and the PMTCT rates were 91.15 % (608/667) and 96.57 % (535/554) respectively. HIV positive rate, mortality rate and mother to child transmission rate of the infants aged 18 months were 1.44 % (8/554), 3.07 % (17/554) and 1.91 % (8/418) respectively, and the physical examination results of the infants aged 18 months showed that the physical dysplasia rate was 30.51 % (169/554). Among the 1 109 infants in the control group, the physical dysplasia rate was 9.83 % (109/1 109). The difference between the case group and the control group was significant ( P<0.01). Conclusion:The PMTCT rates of HIV positive mother and their children were more than 90.00 %, respectively. However, poor physical development rate of infants aged 18 months were more than 30.00 %. The possible influence of PMTCT on physical development of the infants aged 18 months of HIV positive mother’s needs to be further studied.