Objective: To analyze the impact of persistent obesity on their lung function, so as to offer insights for implementing intervention measures to increase lung function in obese school age children. Methods: A total of 335 children from the Sheyang Mini Birth Cohort established in 2009 in Yancheng City, Jiangsu Province, who participated in the follow up at the ages of 7 years (2016) and 10 years (2019), were selected as the study participants. Physical measurements including height, weight, and lung function were recorded. According to the World Health Organization standard, that is, gender and age specific to correct the body mass index to calculate the body mass index Z score, was used to evaluate the obesity status of children at the age of 7 and 10. Children were divided into four groups, including sustained non obesity group, restored obesity group, newly classified obesity group, and persistent obesity group. Meanwhile, the lung function prediction equations recommended by the Global Lung Function Initiative were used to standardize the lung function indexes of children. Pulmonary function differences among these groups were examined, and the relationship between childhood obesity and pulmonary function was longitudinally analyzed using generalized estimating equations. Results: The prevalence of obesity were 9.0% and 16.1% at the age of 7 and 10 years, respectively. The proportion of both newly classified and persistent obesity group were 8.1%, respectively. The forced expiratory volume in one second (FEV 1) and forced vital capacity (FVC) were (1 269.90±202.70) and (1 415.70±230.00) mL, respectively, at the age of 7 years. FEV 1 and FVC at the age of 10 years were (1 440.80±403.20) and (1 555.60±517.60) mL, respectively. Cross sectional analysis at age 7 showed that forced expiratory flow at 75% vital capacity (FEF 75 ) ( β=-0.52, 95%CI =-0.96--0.07) and maximal mid expiratary flow (MMEF) ( β=-0.45, 95%CI =-0.89--0.00) were significantly lower in obese children compared to their non obese peers ( P < 0.05). Longitudinal analysis indicated that obese children had lower levels of lung pulmonary function, with a statistically significant difference in FEV 1 ( β=-0.44, 95%CI=-0.85--0.02, P <0.05). There was no significant difference among the various obesity groups ( P >0.05), while gender stratified results revealed significant reductions in FEV 1/FVC in newly classified obese girls at age 10 years ( β=-1.76, 95%CI =-3.13--0.38) and in MMEF in persistently obese girls at age 10 years ( β=-1.44, 95%CI = -2.79- -0.09) ( P <0.05). Conclusion Obesity may contribute to reduced lung function levels in school aged children, with newly classified and persistent obesity having more pronounced effects on lung function in girls.

Objective To investigate the separation efficiency of three physical separation methods for gaseous ¹⁴C, namely membrane separation, adsorption separation, and low-temperature separation, to screen for the optimal separation method, and to provide a reference for the separation and enrichment of ¹⁴CO₂ in online monitoring of ¹⁴C. Methods The experimental plan was designed, and three devices were constructed for separation and purification experiments. The purity, recovery rate, and separation time of CO₂ separated by the three methods were analyzed. Results All the three methods achieved the separation of CO₂. Under certain conditions, 20 mL of sample gas was obtained. The separation time of membrane separation method was 0.5 hour, CO₂ gas with a sample purity of 0.0486%-0.0488%VOL was obtained, and the recovery rate was only 2.5%−12.7%. The separation time of MOF material adsorption separation method was 24−30 hours, CO₂ gas with a sample purity of 20.2%−47.5%VOL was obtained, and the recovery rate was 57.3%−63.2%. The separation time of low-temperature separation method was 3 hours, CO₂ gas with a sample purity of 96.0%−99.8%VOL was obtained, and the recovery rate was 81.5%−92.5%. Conclusion The purity and recovery rate of CO₂ with low-temperature separation method were higher compared to membrane separation method and MOF material adsorption separation method. The separation time of low-temperature separation method was moderate. The low-temperature separation method can provide a reference for the enrichment technology of ¹⁴C in the rapid measurement of gaseous ¹⁴C effluent.

【Objective】 To investigate the status quo of disease perception and partner support of erectile dysfunction (ED) patients, and to analyze their correlation. 【Methods】 With convenient sampling method, 220 ED patients in a first-class hospital in Taiyuan were surveyed with the short version of disease perception questionnaire (BIPQ) and partner support coping questionnaire (DCI). 【Results】 The BIPQ score was (41.90±7.33), and the DCI score was (116.79±20.37). Pearson correlation analysis showed that except life influence, treatment control and emotional influence, the mutual support dimension of partner support of ED patients was correlated with all dimensions of disease perception (r=-0.173, 0.151, -0.182, 0.163, 0.188,P<0.05).Except cognitive comprehension, the negative support dimension of partner support of ED patients was correlated with the dimensions and total score of disease perception (r=0.399, 0.185, -0.167, -0.306, 0.269, 0.445, 0.320, 0.357,P<0.05). 【Conclusion】 ED patients have negative disease perception, and their partners have better coping strategies. Medical staff may pay more attention to partner support so as to reduce patients’ negative perception of disease and promote recovery.

Objective To analyze the daily quality assurance(QA)measurement results of IBA Sphinx Compact device on the Mevion compact pencil beam scanning proton therapy system for evaluating its clinical application value in proton therapy.Methods The daily QA measurement of Mevion S250i proton therapy system was carried out with Sphinx Compact device for 30 consecutive days,and the measurement results were analyzed.Results The average deviation between the positioning laser and the image center was(0.42±0.27)mm in 30 days.All of the proximal and distal depth errors of the high-and low-energy pencil beams were within 0.50 mm.The position deviation of all the spots measured did not exceed 1.00 mm,and the size deviation was less than 7.5%.The deviation between the image center and the beam center was not more than 0.75 mm.The relative deviation of the flatness of the rectangular field was about 0.5%.The deviation of the output dose of the square field was within 1.0%.Conclusion The proton system daily QA measurement items recommended by AAPM TG-224 report can be accurately and rapidly measured with Sphinx Compact device.The device is a practical and efficient daily QA tool with high practical value in clinic.

Objective To explore the efficacy and safety of subretinal injection of conbercept in treating refractory neovascular age-related macular degeneration(nAMD).Methods In this prospective clinical study,17 eyes of 17 pa-tients diagnosed with refractory nAMD at the Department of Fundus Disease,the Affiliated Eye Hospital of Nanchang Uni-versity from March 2022 to September 2023 were enrolled.The 10 g·L-1 conbercept was injected into the subretinal area of the macular area using a 41G ultra-fine microneedle.If retinal exudation was found in the macular area by optical coherence tomography during the follow-up,the intravitreal injection of 10 g·L-1 conbercept was performed.The best corrected vis-ual acuity(BCVA),central macular retinal thickness(CMT),number of injections and complications were recorded before and 1,3,6,and 12 months after the operation.Results Compared with the preoperative values,the BCVA of patients significantly improved(all P＜0.001)1,3,6 and 12 months postoperatively.There was no significant change in BCVA at each time point after operation(all P＞0.05).Compared with pre-operation,CMT of patients significantly decreased at 1,3,6 and 12 months after operation(all P＜0.001).From 1 month to 12 months after the operation,the CMT of patients gradually decreased(all P＜0.001).Pearson correlation analysis showed that there were positive correlations between pre-operative BCVA and preoperative CMT,preoperative BCVA and 12-month postoperative BCVA(r=0.643,P=0.005;r=0.634,P=0.006).During the treatment,the number of anti-vascular endothelial growth factor injections in 17 eyes was(1.35±0.61)times,with 1 time in 12 eyes,2 times in 4 eyes,and 3 times in 1 eye.Correlation analysis showed that the number of injections was positively correlated with preoperative CMT(r=0.664,P=0.004).No intraoperative or postop-erative complications related to the operation occurred in 17 eyes.Conclusion Subretinal injection of conbercept,which can reduce CMT and improve visual prognosis,is a safe and effective treatment method for refractory nAMD.

Objective:To analyze the efficacy of high-throughput hemodialysis (HFHD) therapy on the application of serum ferritin (SF), transferrin saturation (TSAT), ferromodultin (Hepc) and soluble transferrin receptor (sTfR) levels in maintenance hemodialysis (MHD) with renal anemia.Methods:The uremic patients with MHD treatment in the Third People′s Hospital of Hangzhou City from August 2020 to July 2023 were selected as the study object. They were divided into high throughput (30 cases) and low throughput (30 cases) according the treatment methods. The general data; anemia indexes, including red blood cell count (RBC), hemoglobin (Hb), hematocrit (HCT), percentage of reticulocytes (Ret); iron metabolism indexes (SF, TSAT, Hepc and sTfR); inflammations indexes, including β 2-microglobulin (β 2-MG), C-reactive protein (CRP), interleukin-6 (IL-6); renal function indexes, including blood creatinine (SCr), urine creatinine (Cr), blood urea nitrogen (BUN); and adverse reaction were collected. Results:After treatment, the levels of RBC, Hb, HCT, SF and TSAT in the high-throughput group were increased compared with those before treatment: (3.33 ± 0.43) × 10 12/L vs. (2.12 ± 0.24) × 10 12/L, (118.08 ± 11.36) g/L vs. (98.23 ± 8.58) g/L, 0.354 ± 0.030 vs. 0.228 ± 0.037, (486.23 ± 68.22) μg/L vs. (149.34 ± 39.62) μg/L, (36.24 ± 5.82)% vs. (18.72 ± 6.14)%, After treatment, the levels of RBC, Hb, HCT, SF and TSAT in the low-throughput group were increased compared with those before treatment: (2.79 ± 0.32) × 10 12/L vs. (2.19 ± 0.27) × 10 12/L, (111.98 ± 9.07) g/L vs. (97.60 ± 8.33) g/L, 0.330 ± 0.036 vs. 0.214 ± 0.037, (332.73 ± 56.35) μg/L vs. (151.25 ± 39.90) μg/L, (22.23 ± 6.60)% vs. (17.97 ± 5.72)%. In the high-throughput group, after treatment compared with before treatment, Ret, Hepc, sTfR, β 2-MG, CRP, IL-6, SCr, Cr and BUN levels all decreased: (1.02 ± 0.58)% vs.(1.64 ± 0.99)%, (71.56 ± 5.67) μg/L vs. (89.56 ± 7.62) μg/L, (395.07 ± 37.10) μg/L vs. (471.37 ± 41.18) μg/L, (8.38 ± 1.94) μg/L vs. (13.79 ± 2.09) μg/L, (1.07 ± 0.23) mg/L vs. (2.28 ± 0.20) mg/L, (11.40 ± 2.84) ng/L vs. (22.74 ± 6.38) ng/L, (351.54 ± 62.05) μmol/L vs. (530.04 ± 85.06) μmol/L, (6.32 ± 1.49) nmol/L vs. (11.52 ± 2.37) nmol/L, (6.75 ± 1.51) mmol/L vs. (18.37 ± 4.52) mmol/L, compared with before and after treatment in low throughput group, Ret value, Hepc, sTfR, β 2-MG, CRP, IL-6, SCr, Cr and BUN levels decreased: (1.40 ± 0.65)% vs. (1.67 ± 0.78)%, (84.33 ± 7.45) μg/L vs. (88.97 ± 7.79) μg/L, (431.20 ± 37.59) μg/L vs. (459.56 ± 42.22) μg/L, (11.35 ± 1.06) μg/L vs. (14.00 ± 1.90) μg/L, (1.57 ± 0.27) mg/L vs. (2.19 ± 0.23) mg/L, (16..85 ± 3.02) ng/L vs. (23.38 ± 6.17) ng/L, (389.48 ± 67.03) μmol/L vs. (531.02 ± 78.07) μmol/L, (9.80 ± 1.33) nmol/L vs. (11.34 ± 2.18) nmol/L, (7.55 ± 1.21) mmol/L vs. (18.37 ± 4.52) mmol/L, In addition, RBC, Hb, HCT, SF and TSAT levels in high-flux group were higher than those in low-flux group ( P<0.05), while Ret, Hepc, sTfR, β 2-MG, CRP, IL-6, SCr, Cr and BUN levels were lower than those in low-flux group, with statistical significance ( P<0.05). There was no significant difference in the incidence of adverse drug effects between the two groups ( P>0.05). Conclusions:HFHD treatment for patients with renal anemia in MHD has better treatment effect than LFHD, which can effectively correct the anemia state of patients, improve the body iron metabolism response, reduce inflammatory response and improve kidney function, and has certain clinical application value.

Objective:To verify and calibrate the CT modeling curves of three CT devices in RayStation proton treatment planning system (TPS).Methods:CT-mass density (CT-MD) curves were established by CT Hounsfield units of different tissue substitute materials obtained by scanning the model with CT equipment. CT-stopping power (CT-SP) curves were established by calculation based on the chemical composition of various human tissues. The equivalent water thickness of tissue substitute modules was calculated with different CT modeling curves in TPS. The actual equivalent water thickness of various modules was measured by a Bragg peak detector, and compared with the calculated values of TPS to verify the accuracy of different CT models.Results:The differences of CT modeling curves were significantly different under different tube voltage scanning protocols. Compared with CT-MD curves, CT-SP curves based on the stoichiometric calibration were more suitable for proton dose calculation. However, the values of stopping power corresponding to high CT values still needed to be optimized, and the calculation error after calibration was less than 3%.Conclusion:The method of verifying and calibrating CT unit curves of proton TPS is described, proving that the CT-SP curves after stoichiometric calculation are more suitable for proton dose calculation.

Objective To develop a simplified phantom for the calibration of whole-body counters. Methods A simplified phantom design method for the calibration of whole-body counters was established based on the process and method of calibrating whole-body counters. By using the established method and Monte Carlo method, a simplified phantom including the total body, thyroid, lungs, and gastrointestinal tract was designed to calibrate the ORTEC-Stand FAST II whole-body counter. The simplified phantom was compared with the BOMAB phantom through experimental measurements. Results Within the range of 50 keV to 2 MeV, for rays of the same energy in the same organ of the simplified phantom and BOMAB phantom, the simulated data of detection efficiency by whole-body counting showed an error within 5%, and the experimental measurements showed an error within 10%. Conclusion We developed a simplified phantom for the calibration of the whole-body counter, demonstrating the feasibility of using the simplified phantom instead of a physical body phantom for whole-body counter calibration, which can greatly facilitate whole-body counter calibration for internal radiation monitoring.

Objective:To describe the baseline characteristics of the subjects enrolled in the China Quantitative CT (QCT) big data program in 2018—2019.Methods:Based on baseline data from the Chinese health big data project from January 2018 to December 2019 from the eligible enrolled population, measurements of bone mineral density (BMD) and visceral adipose tissue (VAT) were performed using Mindways′ QCT Pro Model 4 system. The baseline data of age, gender, regional distribution, height, weight, abdominal circumference, blood pressure, blood routine and blood biochemical tests were analyzed. And the single factor analysis of variance (ANOVA) was used to check the age related trend of BMD and VAT in both genders.Results:After screening the inclusion exclusion criteria and outliers of the main indicators, 86 113 people were enrolled in the project. The enrollment rate was 92.47%, including 35 431 (41.1%) women and 50 682 (58.9%) men, and the ratio of men to women was 1.43. The mean age was (50.3±12.7) years in all the subjects, and it was (50.2±12.8) years and (50.4±12.5) years in men and women, respectively, and there was no statistical difference between the two genders ( P>0.05). Total of 43 833 people were enrolled in east China, it was the largest group by region (50.90%), it was followed by central China (16 434 people, 19.08%), and the number of people enrolled in Northeast China was the lowest (2 914 people, 3.38%). The rate of completing of health information indicators related to the main outcome of the study were all above 70%, and there were significant differences between men and women (all P<0.05). The mean BMD was (139.33±46.76) mg/cm 3 in women, (135.90±36.48) mg/cm 3 in men, which showed a decreasing trend with age in both gender (both P<0.001); the mean intra-abdominal fat area was (116.39±56.23) cm 2 in women, (191.67±77.07) cm 2 in men, and there was an increasing trend with age in both men and women (both P<0.001). Conclusions:There are gender differences in BMD and VAT measured by QCT with different age tendency, and there are gender differences in health information index. Regional factors should also be taken into account for regional differences in the inclusion of data.

Pseudomonas aeruginosa is a common pathogen of respiratory infections. The conventional diagnostic methods for Pseudomonas aeruginosa have certain weakness, for example, sputum culture is time-consuming and of low sensitivity; and polymerase chain reaction cannot be popularized clinically due to its high cost. Meanwhile, detection of volatile organic compounds is a sensitive, rapid, portable and inexpensive diagnostic method. This review focuses on the detection of volatile organic compounds in the diagnosis of Pseudomonas aeruginosa respiratory infection, discusses the existing problems, and puts forward relevant suggestions to provide reference for clinical application and future researches.