Objective To investigate the impact of various health education intervention strategies on the proper use of personal respiratory protective equipment (RPE) among workers exposed to dust. Methods Dust-exposed workers were recruited from 60 selected enterprises in Guangdong Province using cluster random sampling method. They were randomly allocated to the control, low-intensity intervention, and high-intensity intervention groups, with 358, 346, and 371 workers in each group, respectively. Workers in the control group received no designed intervention. Workers in the low-intensity intervention group received traditional plus mobile health education on the proper use of RPE. Workers in the high-intensity intervention group received all components of the low-intensity intervention, supplemented with peer education. The intervention lasted for six months. RPE usage was compared among the three groups of workers before and after the intervention. Results Workers in the control, low-intensity intervention, and high-intensity intervention groups showed higher rates of both RPE wearing and correct RPE wearing after the intervention than before it within their respective groups (RPE wearing rate: 94.1% vs 99.2%, 95.7% vs 100.0%, 94.6% vs 100.0%, all P<0.01; correct RPE wearing rate: 66.8% vs 91.1%, 67.3% vs 95.7%, 66.6% vs 96.5%, all P<0.01). Post-intervention correct RPE wearing rates were highest in the high-intensity intervention group, followed by the low-intensity intervention group, and the control group, with the percentage of 96.50%, 95.66% and 91.06%, respectively (P<0.01). Binary logistic regression analysis result showed that different intervention strategies affected the correct use of personal RPE among dust-exposed workers after adjusting for gender, age, and other confounding factors (P<0.05). Compared with the control group, the rates of correct RPE use increased in the low-intensity intervention group and the high-intensity intervention group (odd ratio was 2.14 and 3.01; 95% confidence interval was 1.12 - 4.10 and 1.53 - 5.91, respectively). Conclusion The implementation of traditional plus mobile health education interventions on the proper use of RPE can promote correct RPE utilization among dust-exposed workers, and integrating peer education further enhances the intervention effectiveness.

Objective To investigate the reasons of artifacts in 64-slice spiral CT coronary angiography.Methods One hundred patients with diagnosed or suspected coronary artery disease underwent retrospectively ECG-gated 64-slice spiral CT coronary angiogruphy.Maximum intensity projection(MIP),muhiplanar reformation(MPR)and volume rendering technique(VRT)were reconstructed.The reasons of artifacts were assessed by two experienced radiologists.Results A total of 1347 segments(1347/1500,89.8%)were reviewed,the artifacts were found in 192 segments(14.2%).Breath movement was the moat common artifact(124/192).and the other reasons included fast rate and irregular rhythm of the heart beat (42/192).while the phase mismatch was the third reason(22/192).Conclusions The common artifacts of 64-slice spiral CT coronary angiography includes breath movement,fast rate and irregular rhythm of heart beat and phage mismatch.Breath-holding control,low rate and regular rhythm of heart beat,muhiphage reconstruction are suggested for the accurate diagnosis.