Objective To investigate the value of 64 row CT low dose scanning technique in thyroid enhancement scanning.Methods From Jan.2016 to Dec.2017,152 patients with thyroid occupying lesions were studied in our hospital.All the patients underwent multislice spiral CT enhanced scan and pathological examination.The patients were divided into four groups according to the different current and voltage of multislice spiral CT.The significance of multi slice spiral CT scanning in the 4 groups was compared.Results There were no significant differences (U=0.1825,P=0.351 8＞0.05)among the four groups of multi-slice spiral CT in the detection rate of nodular thyroid lesions (96.21％,94.38％,85.71％,87.50％) or the detection rate of diffuse thyroid lesions (77.78％,83.33％,80.00％,83.33％).There were significant differences in CTDIvol,DLP and ED among the four groups (P＜0.05),and the radiation dose of group D was lower than that of group A and C.There were significant differences in thyroid CT value,background noise and background signal among the four groups (P＜0.05).The thyroid CT value,background noise and background signal in group D were higher than those in group A,B and C (P＜0.05).There was no significant difference in SNR and CNR among the four groups (P＞0.05).There was no significant difference in subjective evaluation of CT scan images between the four groups (P＞0.05).Conclusion The multislice spiral CT low-dose scanning technique used in thyroid enhanced scan can obtain satisfying scanning images,which is not only beneficial to the quality of the images,but also can improve the accuracy of the diagnosis and reduce the ionizing radiation damage to the patients.

The suspected severe fever with thrombocytopenia syndrome ( SFTS) cases of pharyngeal swab detection of severe fever with thrombocytopenia syndrome virus ( SFTSV) , to discuss the possibility of spread of respiratory tract. According to the suspected cases of inclusive criteria from national Ministry of Health issued " National guideline for prevention and control of severe fever with thrombocytopenia syndrome (2010)". May to September in 2013, we collect serum and throat swab of 72 suspected SFTS cases from the sentinel surveillance hospital in SFTS high?incidence area ( Xinyang, He′nan Province) . Real?time RT?PCR and ELISA methods for the detection of SFTSV were used in this study. In 72 suspected SFTS cases, 52 (72?2%) were detected positive, 46 were positive for RT?PCR, 6 were positive for ELISA. In 52 SFTSV positive cases, 4 ( 7?7%) cases were found with positive nuclei acid of SFTSV in throat swab samples. in 20 SFTSV negative cases, all the throat swab samples from the patients were also negative. The 4 SFTSV positive cases were severe, with cough and the highest viral load of up to 108 copies/mL. SFTSV can be detected in the throat swabs from patients, and the positive rate of throat swabs is much lower than that of serum samples. The feasibility of detecting SFTSV is disputable. SFTS patients with positive throat swab samples possessed the high viral load and cough symptoms, which may increase the risk of SFTSV transmission through the respiratory tract.