In recent years,research on carotid atherosclerosis has turned to the aspect of neovascularization in vulnerable plaques.The evaluation of neovascularization in plaques using contrast-enhanced ultrasonography has become one of the novel technologies to determine the plaque stability.This article reviews the principles of contrast-enhanced ultrasonography and its application in the evaluation of neovascularization in carotid atherosclerotic plaques and vulnerable plaques.

Objective:To analyze the surveillance results of iodine deficiency disorders in Fuzhou City, Jiangxi Province, so as to master the iodine nutrition level of key population and evaluate the prevention and treatment effect of iodine deficiency disorders in the city.Methods:From 2017 to 2019, counties (districts) under the jurisdiction of Fuzhou City in Jiangxi Province were divided into five sampling areas (east, west, south, north, and central). A township was selected in each area, and a primary school was selected in each township. Forty children aged 8 to 10 were elected in each primary school. At the same time, 20 pregnant women were selected from each area. Home salt samples and urine samples of children and pregnant women were collected to determine the contents of salt iodine and urinary iodine, and the thyroid of children was examined by B-mode ultrasonography.Results:A total of 6 001 salt samples from children's homes were tested. The median iodine content of children's home salt samples was 24.60 mg/kg, the coverage rate of iodized salt reached 99.77% (5 987/6 001), and the edible rate of qualified iodized salt was 96.20% (5 773/6 001). A total of 3 000 salt samples from pregnant women's homes were tested. The median iodine content of pregnant women's home salt samples was 24.81 mg/kg, the coverage rate of iodized salt reached 99.97% (2 999/3 000), and the edible rate of qualified iodized salt was 96.97% (2 909/3 000). A total of 6 001 children's urine samples were tested, and the median urinary iodine was 172.23 μg/L. A total of 3 000 pregnant women's urine samples were tested, and the median urinary iodine was 178.35 μg/L. The rate of goiter in children was 1.00% (8/800) in 2017, 1.33% (8/600) in 2018, and 1.12% (9/800) in 2019.Conclusion:The iodine nutrition level of children and pregnant women in Fuzhou City of Jiangxi Province is suitable and meets the requirements of iodine deficiency disorders elimination standard.