Objective:To investigate the distribution of iodine and other chemical elements in soil, grain and vegetables in different water iodine areas of Xi'an City, and to provide theoretical basis for prevention and treatment of iodine related diseases and water improvement measures.Methods:From September to November 2021, a stratified cluster sampling method was used to select three survey villages in Xi'an, namely Yehu Village, Xingbei Village, and Quanzhong Village, where the iodine level of residents' drinking water < 10, 10 - 100, and > 100 μg/L. Drinking water samples were collected from seven survey sites based on the source of domestic drinking water to determine the iodine level of the water. At the same time, soil samples of cultivated land, residents' grains (wheat, corn), and vegetables were collected from survey villages to determine the content of 14 elements including calcium, iron, magnesium, chromium, nickel, copper, zinc, cadmium, lead, arsenic, mercury, selenium, iodine, and fluoride.Results:The iodine level in the water of 7 survey sites in three survey villages was 5.80, 6.40, 25.51, 42.20, 53.90, 111.65, and 177.63 μg/L, respectively. A total of 70 samples of soil, 65 samples of wheat, 76 samples of corn, and 141 samples of vegetables were collected. Among them, the levels of various elements in vegetables and grains were lower than those in the soil. Only calcium and fluoride were higher in vegetables than in grains, while iron, chromium, copper, zinc, selenium, and iodine were lower in vegetables than in grains. According to the range of water iodine level, there were statistically significant differences in the content of calcium, iron, chromium, nickel, copper, zinc, mercury, iodine, and fluoride in soils from different water iodine regions ( Fcalcium, iron, chromium, nickel = 42.04, 13.55, 12.22, 11.20, Hcopper, zinc, mercury, iodine, fluoride = 14.27, 9.19, 14.72, 25.14, 16.50, P < 0.05). The comparison of magnesium, zinc, cadmium, arsenic, and selenium content in wheat showed statistically significant differences ( Fadmium, selenium = 6.34, 3.31, Hmagnesium, zinc, arsenic = 6.12, 11.55, 6.23, P < 0.05). The comparison of calcium, iron, magnesium, chromium, nickel, copper, zinc, cadmium, lead, arsenic, mercury, iodine, and fluoride content in corn showed statistically significant differences ( Fmagnesium, chromium, nickel, copper, zinc, iodine = 18.89, 13.76, 17.86, 24.17, 28.46, 15.96, Hcalcium, iron, cadmium, lead, arsenic, mercury, fluoride = 11.57, 40.53, 26.50, 33.05, 33.73, 36.01, 29.21, P < 0.05). The comparison of calcium, iron, magnesium, chromium, zinc, cadmium, lead, arsenic, mercury, and selenium content in vegetables showed statistically significant differences ( H = 23.93, 8.12, 10.03, 7.01, 16.09, 18.36, 23.07, 6.51, 27.67, 7.86, P < 0.05). Conclusions:There are significant differences in the distribution of 14 elements in soil, grain, and vegetables in different water iodine regions. In addition to drinking water, precise guidance should also be provided based on the iodine content in soil, grain, and vegetables in different water iodine areas.

Objective To observe CT manifestations of unicentric Castleman disease(UCD)in children.Methods Totally 7 children with solitary UCD confirmed by postoperative pathology were retrospectively enrolled,and CT manifestations of lesions were observed.Results The lesions presented as circular mass,with smooth,regular and clear edge in all 7 cases,the maximum diameter of lesions was 15.1-74.3 mm,and the average diameter was(42.57±19.05)mm.Among 7 cases,lesions located in the neck,mediastinum and abdominal cavity each in 2 cases,respectively,while in 1 case located in inguinal area.Non-enhanced CT showed soft tissue density lesion in all 7 cases including 6 with uniform density without bleeding,calcification or necrosis,while lesion in mediastinum had short linear high-density calcification in 1 case.Satellite lesions around the mass were noticed in 6 cases.After enhanced scanning,in arterial phase lesions moderately enhanced in 4 cases and significantly enhanced in 3 cases,which all significantly enhanced in venous phase,and abundant small blood vessels around lesions were observed in all 7 cases,while fissure signs were observed in 3 cases.Conclusion UCD in children presented as soft tissue mass with clear boundary,uniform density and significant enhancement on CT,with abundant nourishing blood vessels and satellite lesions around,while some with calcifications and fissure signs.

Objective:To investigate the distribution of iodine and other chemical elements in soil, grain and vegetables in different water iodine areas of Xi'an City, and to provide theoretical basis for prevention and treatment of iodine related diseases and water improvement measures.Methods:From September to November 2021, a stratified cluster sampling method was used to select three survey villages in Xi'an, namely Yehu Village, Xingbei Village, and Quanzhong Village, where the iodine level of residents' drinking water < 10, 10 - 100, and > 100 μg/L. Drinking water samples were collected from seven survey sites based on the source of domestic drinking water to determine the iodine level of the water. At the same time, soil samples of cultivated land, residents' grains (wheat, corn), and vegetables were collected from survey villages to determine the content of 14 elements including calcium, iron, magnesium, chromium, nickel, copper, zinc, cadmium, lead, arsenic, mercury, selenium, iodine, and fluoride.Results:The iodine level in the water of 7 survey sites in three survey villages was 5.80, 6.40, 25.51, 42.20, 53.90, 111.65, and 177.63 μg/L, respectively. A total of 70 samples of soil, 65 samples of wheat, 76 samples of corn, and 141 samples of vegetables were collected. Among them, the levels of various elements in vegetables and grains were lower than those in the soil. Only calcium and fluoride were higher in vegetables than in grains, while iron, chromium, copper, zinc, selenium, and iodine were lower in vegetables than in grains. According to the range of water iodine level, there were statistically significant differences in the content of calcium, iron, chromium, nickel, copper, zinc, mercury, iodine, and fluoride in soils from different water iodine regions ( Fcalcium, iron, chromium, nickel = 42.04, 13.55, 12.22, 11.20, Hcopper, zinc, mercury, iodine, fluoride = 14.27, 9.19, 14.72, 25.14, 16.50, P < 0.05). The comparison of magnesium, zinc, cadmium, arsenic, and selenium content in wheat showed statistically significant differences ( Fadmium, selenium = 6.34, 3.31, Hmagnesium, zinc, arsenic = 6.12, 11.55, 6.23, P < 0.05). The comparison of calcium, iron, magnesium, chromium, nickel, copper, zinc, cadmium, lead, arsenic, mercury, iodine, and fluoride content in corn showed statistically significant differences ( Fmagnesium, chromium, nickel, copper, zinc, iodine = 18.89, 13.76, 17.86, 24.17, 28.46, 15.96, Hcalcium, iron, cadmium, lead, arsenic, mercury, fluoride = 11.57, 40.53, 26.50, 33.05, 33.73, 36.01, 29.21, P < 0.05). The comparison of calcium, iron, magnesium, chromium, zinc, cadmium, lead, arsenic, mercury, and selenium content in vegetables showed statistically significant differences ( H = 23.93, 8.12, 10.03, 7.01, 16.09, 18.36, 23.07, 6.51, 27.67, 7.86, P < 0.05). Conclusions:There are significant differences in the distribution of 14 elements in soil, grain, and vegetables in different water iodine regions. In addition to drinking water, precise guidance should also be provided based on the iodine content in soil, grain, and vegetables in different water iodine areas.

Objective:To investigate the factors affecting clinical pregnancy outcomes in fresh embryo transfer cycles of patients undergoing ovulation induction with antagonist protocol.Methods:Data from 1001 patients un-dergoing their first antagonist protocol fresh embryo transfer cycle at Department of Reproductive Medicine,The Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine,from December,2016 to June,2024 were collected.Patients were stratified into two groups based on pregnancy outcomes:clinical pregnancy(502 cases)and non-clinical pregnancy(499 cases).General characteristics,controlled ovarian stimulation pa-rameters,and laboratory data were analyzed.Independent factors affecting clinical pregnancy were identified through univariate analysis and multivariate binary Logistic regression analysis.Results:Multivariate binary Logis-tic regression analysis indicated that advanced maternal age(≥35 years)and HCG-day progesterone(P)levels were identified as inhibitory factors for clinical pregnancy(OR 0.571,95％CI 0.400-0.815,P＜0.05;OR 0.832,95％CI 0.720-0.961,P＜0.05).Endometrial thickness on HCG-day,2PN cleavage rate,and the number of trans-ferable embryos were significant positive predictors of clinical pregnancy(OR 1.095,95％CI 1.011-1.186;OR 1.036,95％CI 1.006-1.067,P＜0.05;OR 1.122,95％CI 1.039-1.211,P＜0.05).Embryo transfer strategy signifi-cantly impacted outcomes:transferring one cleavage-stage embryo or one blastocyst resulted in lower pregnancy rates compared to dual cleavage-stage embryo transfer(OR0.359,95％CI 0.195-0.658,P＜0.05;OR 0.457,95％CI 0.285-0.733,P＜0.05).Conclusions:Maternal age,HCG-day P levels,endometrial thickness on HCG-day,2PN cleavage rate,number of transferable embryos and embryo transfer strategy are independent pre-dictors of clinical pregnancy in antagonist protocol of fresh cycles.Individualized treatment protocols should con-sider these factors and maternal-infant health priorities to optimize pregnancy success.

Objective:To investigate the factors affecting clinical pregnancy outcomes in fresh embryo transfer cycles of patients undergoing ovulation induction with antagonist protocol.Methods:Data from 1001 patients un-dergoing their first antagonist protocol fresh embryo transfer cycle at Department of Reproductive Medicine,The Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine,from December,2016 to June,2024 were collected.Patients were stratified into two groups based on pregnancy outcomes:clinical pregnancy(502 cases)and non-clinical pregnancy(499 cases).General characteristics,controlled ovarian stimulation pa-rameters,and laboratory data were analyzed.Independent factors affecting clinical pregnancy were identified through univariate analysis and multivariate binary Logistic regression analysis.Results:Multivariate binary Logis-tic regression analysis indicated that advanced maternal age(≥35 years)and HCG-day progesterone(P)levels were identified as inhibitory factors for clinical pregnancy(OR 0.571,95％CI 0.400-0.815,P＜0.05;OR 0.832,95％CI 0.720-0.961,P＜0.05).Endometrial thickness on HCG-day,2PN cleavage rate,and the number of trans-ferable embryos were significant positive predictors of clinical pregnancy(OR 1.095,95％CI 1.011-1.186;OR 1.036,95％CI 1.006-1.067,P＜0.05;OR 1.122,95％CI 1.039-1.211,P＜0.05).Embryo transfer strategy signifi-cantly impacted outcomes:transferring one cleavage-stage embryo or one blastocyst resulted in lower pregnancy rates compared to dual cleavage-stage embryo transfer(OR0.359,95％CI 0.195-0.658,P＜0.05;OR 0.457,95％CI 0.285-0.733,P＜0.05).Conclusions:Maternal age,HCG-day P levels,endometrial thickness on HCG-day,2PN cleavage rate,number of transferable embryos and embryo transfer strategy are independent pre-dictors of clinical pregnancy in antagonist protocol of fresh cycles.Individualized treatment protocols should con-sider these factors and maternal-infant health priorities to optimize pregnancy success.

Objective To observe CT manifestations of unicentric Castleman disease(UCD)in children.Methods Totally 7 children with solitary UCD confirmed by postoperative pathology were retrospectively enrolled,and CT manifestations of lesions were observed.Results The lesions presented as circular mass,with smooth,regular and clear edge in all 7 cases,the maximum diameter of lesions was 15.1-74.3 mm,and the average diameter was(42.57±19.05)mm.Among 7 cases,lesions located in the neck,mediastinum and abdominal cavity each in 2 cases,respectively,while in 1 case located in inguinal area.Non-enhanced CT showed soft tissue density lesion in all 7 cases including 6 with uniform density without bleeding,calcification or necrosis,while lesion in mediastinum had short linear high-density calcification in 1 case.Satellite lesions around the mass were noticed in 6 cases.After enhanced scanning,in arterial phase lesions moderately enhanced in 4 cases and significantly enhanced in 3 cases,which all significantly enhanced in venous phase,and abundant small blood vessels around lesions were observed in all 7 cases,while fissure signs were observed in 3 cases.Conclusion UCD in children presented as soft tissue mass with clear boundary,uniform density and significant enhancement on CT,with abundant nourishing blood vessels and satellite lesions around,while some with calcifications and fissure signs.

Objective: To evaluate the dynamic prevalence of dental fluorosis of children and levels of fluoride in drinking water after improvement of water in Xi an City, to provide scientific basis for water fluoridation improvement. Methods: A total of 35 fluorosis endemic villages were selected as fixed monitor sites in 2014-2018, the ways of water improvement were surveyed, water fluorine content were detected and the prevalence of dental fluorosis in children aged 8 to 12 years were examined. Results: Rates of excess fluoride in drinking water from 2014 to 2018 were 22.86%, 14.29%,11.43%, 11.43% and 8.57%, the difference were significant(χ2=16.44, P<0.01).The dental fluorosis detection rates of children aged 8 to 12 years were 20.89%,18.22%,17.46%,18.13% and 16.76% in 2014-2018 which showed a obvious descending trend by year(χ2=10.02, P<0.01). The detection rate of dental fluorosis in children aged 8 and 9 years showed a decreasing trend by year(χ2=6.53, 4.54, P<0.05).The difference of total rate of dental fluorisis,rate of mild cases rate of moderate-to-severe cases were statistically between the villages without qualified water and the villages with normal fluorine water(χ2=179.22, 167.93,10.35, P<0.01). The rate of detection in the villages with the water fluorine exceed standard in 2014-2018 showed a declining trend year by year(χ2=28.50, P<0.01). The detection rate were significant different across water improvement methods(χ2=197.76, P<0.01). Detection rate of dental fluorosis decreased from 2014 to 2018 in the areas with municipal water supply showed a decreasing after year(χ2=12.16, P<0.01). Conclusion The improvement of municipal water supply shows significant effects on water fluorosis control, the detection rate of water fluoride and children s dental fluorosis in some villages with the other ways of water improvement are still higher than expected, the continuously monitor of fluoride content in water and dental fluorosis in children should be strengthened.

Objective:To evaluate the effect of different water-improving methods on dental fluorosis of children aged 8 to 12 in drinking-water-borne fluorosis areas in Xi'an City, and provide basis for making fine prevention and control measures.Methods:In 2018, 50 drinking-water-borne fluorosis villages in Xi'an City with water improvement time from 2011 to 2013 were selected as survey sites. The condition and the way of water improvement were surveyed, water fluoride content was determined and the prevalence of dental fluorosis in children aged 8 to 12 was examined, and the rates of dental fluorosis were compared before and after the water improvement in the 50 villages.Results:The water-improving projects were in normal operation in 50 villages. The medians of water fluoride content were 0.31, 0.88 and 1.14 mg/L in villages with municipal water supply, low fluorine well and defluoridation treatment water supply (the villages of different water-improvement methods were 12, 24 and 14, respectively), the differences were statistically significant ( H = 75.54, P < 0.01). The qualification rates of water fluoride in villages with different water-improvement methods were 100.00% (12/12), 79.17% (19/24) and 57.14% (8/14), and the difference was statistically significant (χ 2 = 6.95, P < 0.05). The detection rate of dental fluorosis was 43.17% (218/505) in the 11 villages with excessive water fluoride content, and the detection rate was 20.77% (331/1 594) in the 39 villages with qualified water fluoride content, the difference was statistically significant (χ 2 = 99.66, P < 0.01). After water improvement, the total detection rate of dental fluorosis (26.16%, 549/2 099) in the 50 villages was lower than that before water improvement (41.66%, 959/2 302), the difference was statistically significant (χ 2 = 117.17, P < 0.01). The detection rates of dental fluorosis were reduced after the water improvement in villages with municipal water supply and low fluorine well, the differences were statistically significant (χ 2 = 74.37, 69.36, P < 0.01). The detection rate was declined after water improvement in villages with defluoridation treatment water supply, but the difference was not significant (χ 2 = 0.78, P > 0.05). There was a statistically significant difference in the detection rate of dental fluorosis among children in villages with different water-improvement methods (χ 2 = 72.79, P < 0.01). The detection rate of dental fluorosis in villages with defluoridation treatment water supply [39.53% (200/506)] was higher than that in villages with municipal water supply [17.97% (133/740)] and low fluorine well [25.32% (216/853)], the differences were statistically significant ( P < 0.017); the detection rate of dental fluorosis in villages with municipal water supply was lower than that in villages with low fluorine well ( P < 0.017). Conclusions:The dental fluorosis of children's has been effectively controlled in the villages after water improvement in Xi'an City. The fluoride content in the water and the detection rate of dental fluorosis in children in some endemic areas are still high. It is necessary to further improve the water quality or consolidate the improvement effect as soon as possible.

Inflammatory bowel disease (IBD) mainly includes Crohn′s disease (CD) and ulcerative colitis (UC) . The imaging diagnosis of CD is difficult because of its complex disease and varied imaging manifestations. Standardizations of imaging techniques and reports are helpful to improve the imaging diagnosis level of CD. This article aims to provide guideline for the imaging technique selection, scanning scheme formulation, imaging features interpretation and imaging report writing of CD in China.