Objective To compare the techniques of bolus chasing angiography(BCA)and static digital subtraction angiography(DSA).Methods The parameters of BCA and DSA including time of examination,dose of contrast medium,image quality and dose-area product(DAP)were comparatively analysed in 61 patients with symptomatic atherosclerotic peripheral disease.Results DSA in comparison with BCA was of better image quality in showing fibiofibular vessel,but DAP value was high,more contrast medium dose and examined time was long.There was statistically significant difference between both DSA and BCA(P

Objective To observe the value of motion freeze technology(MFT)for improving the quality of cone-beam CT(CBCT)images of renal artery aneurysms.Methods Twenty patients with renal artery aneurysms who would receive transcatheter arterial embolization were prospectively enrolled.Renal artery angiography was performed under the guidance of CBCT,and motion artifacts were processed using MFT.Then subjective and objective evaluation of images before and after MFT correction were performed,aimed on displaying of renal artery,parent artery and vascular tree in target area,and the mean value(mean)and standard deviation(SD)of unit density pixels,margin sharpening error rate of blood vessels were measured and calculated.Results After MFT correction,the displaying of renal artery on maximum intensity projection images and parent artery on reconstructed CBCT images were significantly better than those before correction(both P＜0.05),clear vascular trees could be automatically extracted using Flightplan for Liver software,SD and margin sharpening error rate of blood vessels of renal artery aneurysm significantly decreased but mean significantly increased on CBCT images(all P＜0.05).Conclusion MFT could effectively improve the quality of CBCT images of renal artery aneurysms.

Nonpharmaceutical interventions (NPIs) have been commonly deployed to prevent and control the spread of the coronavirus disease 2019 (COVID-19), resulting in a worldwide decline in influenza prevalence. However, the influenza risk in China warrants cautious assessment. We conducted a cross-sectional, seroepidemiological study in Shandong Province, Northern China in mid-2021. Hemagglutination inhibition was performed to test antibodies against four influenza vaccine strains. A combination of descriptive and meta-analyses was adopted to compare the seroprevalence of influenza antibodies before and during the COVID-19 pandemic. The overall seroprevalence values against A/H1N1pdm09, A/H3N2, B/Victoria, and B/Yamagata were 17.8% (95% CI 16.2%-19.5%), 23.5% (95% CI 21.7%-25.4%), 7.6% (95% CI 6.6%-8.7%), and 15.0 (95% CI 13.5%-16.5%), respectively, in the study period. The overall vaccination rate was extremely low (2.6%). Our results revealed that antibody titers in vaccinated participants were significantly higher than those in unvaccinated individuals (P < 0.001). Notably, the meta-analysis showed that antibodies against A/H1N1pdm09 and A/H3N2 were significantly low in adults after the COVID-19 pandemic (P < 0.01). Increasing vaccination rates and maintaining NPIs are recommended to prevent an elevated influenza risk in China.