RESUMO
The application of 18 F-FDG PET-CT in the diagnosis and treatment of nasopharyngeal carcinoma includes early diagnosis,clinical staging,contouring target volume,predicting the sensitivity of tumors to radiotherapy and effect evaluation,and monitoring the residual and recurrence.However,18 F-FDG uptake of tumor cells is under the influence of various factors,so false positive and false negative are unavoidable.Therefore it is need to develop more specific tracer agent in order to improve the accuracy of diagnosis and treatment,as well as to carry out multicenter clinical trial to identify the correlation of standardized uptake value (SUV)and radiation target volume.
RESUMO
<p><b>OBJECTIVE</b>The approach of this paper is make extracting solution' clarity achieve the request level and reduce the pollution of resinic columns through improved technical procedure. Silkworm dropping have sediment with alcohol extract and acid precipitation, affect the clarify performance quality, and polysaccharide and protein in extracting solution is badly for resinic columns in purification process.</p><p><b>METHOD</b>Added freeze-thaw pretreatment in clarified process and researched three thaw methods effect on clarify performance of extracting solution with silkworm dropping. The adding effects were evaluated by content of polysaccharide and protein, transmittance and the yield of active ingredients during this adding process.</p><p><b>RESULT</b>Through comparing researches of three thaw methods, the microwave thaw method was the best approach.</p><p><b>CONCLUSION</b>Adding freeze-thaw pretreatment in clarify process is not only can improve the clarity of extracting solution with silkworm dropping on ideal level, reduce pollution of resinic columns, but also remain ideally the active ingredients.</p>