The aim of this study was to propose an algorithm for three-dimensional projection onto convex sets (3D POCS) to achieve super resolution reconstruction of 3D lung computer tomography (CT) images, and to introduce multi-resolution mixed display mode to make 3D visualization of pulmonary nodules. Firstly, we built the low resolution 3D images which have spatial displacement in sub pixel level between each other and generate the reference image. Then, we mapped the low resolution images into the high resolution reference image using 3D motion estimation and revised the reference image based on the consistency constraint convex sets to reconstruct the 3D high resolution images iteratively. Finally, we displayed the different resolution images simultaneously. We then estimated the performance of provided method on 5 image sets and compared them with those of 3 interpolation reconstruction methods. The experiments showed that the performance of 3D POCS algorithm was better than that of 3 interpolation reconstruction methods in two aspects, i.e. subjective and objective aspects, and mixed display mode is suitable to the 3D visualization of high resolution of pulmonary nodules.
ObjectiveTo investigate Chinese psychiatrists' mental health. MethodsLiteratures published from January 1989 to March 31, 2013 were searched through Chinese network databases (CNKI, Weipu, Wanfang) and English network database (OVID). Factors of Symptom checklist-90 (SCL-90) were extracted and compared with Chinese norm. These were analyzed by Meta analysis method. ResultsEleven articles were obtained and analyzed, including 725 psychiatrists. The research illustrated that the differences between psychiatrists and Chinese norm of somatization[WMD=0.19, 95%CI (0.05, 0.33), P=0.008], depression[WMD=0.25, 95%CI (0.06, 0.43), P=0.009], anxiety[WMD=0.28, 95%CI (0.09, 0.47), P=0.004], hostility[WMD=0.15, 95%CI (0.01, 0.30), P=0.03], and phobia[WMD=0.11, 95%CI (0.02, 0.20), P=0.02] were significant, while the other 4 factors were not significant (P>0.05). ConclusionPsychiatrists' mental health is poor and intervention measures need to be adopted to improve psychiatrists' mental health.
ObjectiveTo investigate the prevalence of subclinical hypothyroidism (SCH) in health check-up population of West China Hospital of Sichuan University from 2011 to 2012 and to discuss the relationship between SCH and metabolic syndrome (MS). MethodsThose who received thyroid function tests and health examination in the West China Hospital of Sichuan University from 2011 to 2012 were enrolled in the study. The data of medical history, blood pressure, height, weight, thyroid function, TG, HDL-C, FPG were collected. All data were analyzed by SPSS 18.0 software. ResultsA total of 11 976 persons (7 488 male and 4 488 female) received thyroid function tests. There were 1 820 persons (884 males and 936 females, 15.20%) who suffered from SCH. The SCH prevalence was significantly higher in females (20.86%) than that in males (11.81%) (P < 0.01). The people over 60 years old had the highest SCH prevalence. There were 1 145 persons (1 005 males and 140 females) suffered from MS among all 11 976 persons. The MS prevalence was significantly higher in males (13.42%) than that in females (3.12%) (P < 0.01). The SCH prevalence of the MS group was higher, which in the health group was lower (P < 0.01). The TSH level in the MS group was higher, while it was lower in the health group. ConclusionThe prevalence of SCH is higher in health check-up population; and SCH apparently increases the risk of morbidity of MS.