Résumé
As the development of functional and molecular imaging,PET/CT gradually becomes one of methods in optimizing cancer radiotherapy treatment planning.Currently,numerous hospitals routinely use 18F-FDG PET/CT for the delineation of target volume in esophageal carcinoma (EC).However,the validity of 18F-FDG PET/CT in the delineation of target volume for EC is limited and needs further clinical validation.This review focuses on the value and validity of 18F-FDG PET/CT in the delineation of gross tumor target volume of EC primary lesions and regional lymph nodes.
Résumé
<p><b>OBJECTIVE</b>The aim of this survey was to obtain some information of the prevalence of dental caries in the youth aged 12, 15 and 18 years of Sichuan province.</p><p><b>METHODS</b>Based on WHO and national oral health survey standards, dental caries prevalence and treatment needs were investigated randomly in selected young individuals of Sichuan province in 1995.</p><p><b>RESULTS</b>The prevalent rates of caries of 12-, 15-, and 18-year-old adolescents were 28.47% and 36.40% and 39.54% respectively. The mean DMFT of 12-, 15- and 18-year-old were 0.52, 0.81, and 0.99. There are more pit and fissure caries than smooth caries in the young of 12-year-old than those of 15- and 18-year-old.</p><p><b>CONCLUSION</b>Despite improvement can be seen in adolescents' oral health in Sichuan, there remains a proportion of active untreated decays. Some simple prevention programs are needed to stabilize the caries.</p>