0.05).(2)In 67 cases with pre-and post-image selection and reconstruction in single-slice or twin-slice helical CT,the slice concordance rate in measurement was 20.98% and 97.01%,respectively(?2=80.22,P=0.00).The slice concordance was all accomplished with the same method in multi-slice helical CT in 5 cases.(3)Peak heights and SPN-to-aorta ratios of malignant [(38.48?14.32)HU,(19.64?9.52)% ] and inflammatory SPN [(42.48?11.55)HU,(21.14?7.77)%] were significantly higher than that of benign SPN [(9.52?3.78)HU,(3.41?1.86)%,P0.05).Slice optimization of dynamic contrast-enhanced CT scan improved the diagnostic accuracy of SPN from 78% to 80%.Conclusion No significant efficacy was found in the attenuation between primitive images and reconstructive images with the same slice thickness of homogenous material.Slice concordance of dynamic contrast enhanced spiral CT could reflect objectively the morphological appearance and CT value changes of solitary pulmonary nodules,and may improve the veracity of diagnosis.

Objective To investigate the characteristics of self perceived burden (SPB) in patients with chronic obstructive pulmonary disease (COPD) and explore the relationship between the perceived burden and self-efficacy,coping style.Methods A total of 96 cases with COPD in our hospital from January 2015 to June 2017 were enrolled in the study.The clinical data of patients were retrospectively analyzed.The patients were surveyed by self perceived burden scale,self-efficacy scale and coping style scale.The relationship between self perceived burden and self efficacy,coping style were investigated.Results The self perceived burden score of COPD patients was (33.76 ± 7.65) points with moderate level.The symptom management self-efficacy,common disease management self-efficacy score of COPD patients were (8.13 ± 1.09) and (8.22 ± 1.13) respectively with moderate self-efficacy.The total score of coping style in COPD patients was (35.09 ± 10.83) points with positive coping style.The each dimension and the total score of self perceived burden were negatively correlated with positive coping style in COPD patients (P ＜ 0.05),and positively correlated with negative coping styles (P ＜ 0.05).The total score of coping style had no significant correlation with perceived burden scores (P ＞ 0.05).The each dimension and the total score of self perceived burden were negatively correlated with the each dimension scores and total scores of self-efficacy in COPD patients (P ＜ 0.05).Conclusions There are significant correlation between SPB and self-efficacy and coping style in COPD patients.Medical staff should strengthen communication with patients,and guide them with positive coping style in the face of disease,which can effectively improve their self-efficacy and reduce the self perceived burden and promote physical and mental health.