Objective To apply a phantom for dose measurement in interventional therapy for pediatric vascular diseases, and calculate the effective dose (E) and conversion coefficient of dose area product (DAP) to E, and to provide a dose reference for studying radiation dose and radiation protection in children. Methods Thermoluminescent dosimeters were placed in the organs of the phantom. Low-, medium-, and high-dose groups were set for three types of vascular anomalies based on the duration of fluoroscopy. Digital subtraction angiography was used to simulate exposure conditions at different dose levels. The organ dose was measured, and the effective dose was calculated. Results For the three groups of vascular anomalies in the head and face, the red bone marrow doses were 8.15, 30.34, and 43.53 mGy, respectively, the effective doses were 12.88, 47.84, and 73.12 mSv, respectively; and the average conversion coefficient of DAP to E was 2.16. For the three groups of vascular anomalies in the trunk, the red bone marrow doses were 2.11, 15.62, and 31.21 mGy, respectively; the effective doses were 12.39, 70.56, and 134.60 mSv, respectively, and the average conversion coefficient of DAP to E was 3.03. For the three groups of vascular anomalies in the lower extremities, the red bone marrow doses were 3.58, 6.50, and 12.28 mGy, respectively, the effective doses were 3.64, 7.04, and 14.85 mSv, respectively, and the average conversion coefficient of DAP to E was 0.73. Conclusion Patient dose and DAP-to-E conversion coefficient are in the following order: vascular anomalies in the trunk > vascular anomalies in the head and face > vascular anomalies in the lower extremities. The dose data obtained can be used to estimate children’s radiation exposure.

Objeetive: To understand the recurrence of tuberculosis patients in Yunnan Province and its influencing factors,so as to provide scientific basis for the prevention and control of tuberculosis. Methods: Through the tuberculosis management information system, the data of successful treatment of tuberculosis cases in Yunnan Province in 2013 and the data of recurrent tuberculosis cases in Yunnan Province in 2014-2018 were collected. The recurrence rate,recurrence proportion and recurrence time of tuberculosis were analyzed, and the influencing factors of tuberculosis recurrence were analyzed by Cox multi factor proportional risk model. Results : A total of 9787 cases of tuberculosis were investigated. 385 cases recurred in 5 years, accounting for 3.94%. The recurrence rate was 0.73/100 person years. The recurrence interval [M （QR）] was 35.12 （28.57） months. The following are the risk factors for pulmonary tuberculosis recurrence：male（HR=1.297,95%CI：1.031~1.631）,secondary tuberculosis(HR=2.000,95%CI：1.088~3.676) in the 40-59 age group（HR=1.618,95%CI：1.036-2.528）, the retreatment（HR=1.566,95%CI：1.040-2.356）,positive of sputum culture（HR=4.048,95%CI：1.795-9.129）and sputum?smear positive（HR=1.569,95%CI：1.266-1.945）, cavitary pulmonary tuberculosis（ HR=1.382,95%CI：1.112-1.716）. Conclusion The recurrence rate of tuberculosis is low in Yunnnan province, and the risk of pulmonary tuberculosis recurrence is high in male, in the 40-59 age group,retreatment,positive of sputum culture only and sputum smear positive,patients with cavitary tuberculosis.

Objective To investigate the prevalence of COPD in high-risk population in Suzhou, and to explore the corresponding measures against cognitive misunderstanding. Methods From January 2017 to January 2020, a total of 4,800 residents from 4 COPD national monitoring points in Suzhou were selected using a multi-stage stratified cluster sampling method. Questionnaire surveys and lung function tests were conducted. The high-risk groups of COPD and their morbidity and COPD awareness were statistically analyzed. The influencing factors of COPD in Suzhou were analyzed by single factor analysis and multi-factor stepwise logistic regression analysis. Results A total of 4 747 residents were included in the analysis, including 4 249 people with high-risk COPD and 441 confirmed patients. Among them, 75.96% had basic knowledge, 52.15% understood the treatment knowledge, 49.89% understood the self-management, and 61.68% understood the lung rehabilitation training. Multivariate stepwise logistic regression analysis showed that age (OR=1.557, 95%CI=1.202~2.017), daily smoking (OR=2.062, 95%CI=1.673~2.541), cooking fuel being polluted (OR=1.526,95%CI=1.255~1.900), and occupational dust exposure>1 year (OR=1.474, 95%CI=1.196~1.816) were risk factors for COPD, while kitchen with smoke exhaust equipment (OR=0.601, 95%CI=0.465~0.777) and ethnic minorities (OR=0.642, 95%CI=0.508~0.812) were COPD protective factors (P<0.05). Conclusion The incidence of COPD in high-risk population aged ≥40 years in Suzhou area was higher, and the patients' cognitive level was lower. It is necessary to strengthen science popularization, improve health awareness, and reduce the related risk factors.