ABSTRACT
Objective To construct a scientific and rational post competency model of human organ donation coordinators. Methods Based on the onion model, the index pool was initially constructed by literature research and behavioral event interview. The index system was screened, modified and improved using Delphi method. The weight of indexes at all levels was determined by analytic hierarchy process. Results The effective response rates of two rounds of Delphi expert inquiries were both 100%, indicating that the expert opinions were highly dependable. The experts' judgment coefficient (Ca), familiarity (Cs) and authoritative coefficient (Cr) were all above 0.7, indicating that the experts' opinions were highly reliable. The expert coordination coefficients (W) were 0.294 and 0.342 (both P<0.001), indicating that experts delivered coordinated opinions and yielded slight difference in understanding the importance of indexes. Finally, according to the "onion model" theory and experts' opinions, a set of coordinator's post competency model including 6 first-level and 55 second-level indexes was established, which comprised an index surface layer, a middle layer and a core layer. Among them, the core layer represented core professional values, the middle layer was personal quality and professional ethics and quality, and the surface layer was interpersonal communication capability, organizational cooperation capability and professional knowledge and lifelong learning capability. Conclusions The post competency model of organ donation coordinators established in this study consists of 6 first-level and 55 second-level indexes, which is highly effective and reliable.
ABSTRACT
Objective To probe into the optimization of scanning parameters of chest with low-dose spiral CT.Methods The phantom was scanned with different scanning parameters.The image quality obtained with the standard dose parameters and the low-dose technique were compared to evaluate the spatial resolution,low contrast resolution,noise level field uniformity and radiation dose,then the optimal scan parameters were defined.The scanning parameters were 120 kV,0.75 s,Pitch 1.0,FOV 360,RF3 reconstruction model(standard filter).Different thickness and tube electricity were used and the data were analyzed with the statistical method.Results There was significant difference about the data of the CTDI between the 160 mA conventional spiral CT and the low dose groups(30 mA,50 mA,70 mA,90 mA).There was no significant difference about the CTDI between 30 mA and 50 mA,and between 50 mA and 70 mA.There was obviously significant difference about the image noise on 1 mm slice and 10mA with other groups.The spatial resolution and low contrast resolution increased along with the increase of tube electricity,and 50mA was a inflexion of low contrast resolution.Conclusion 50mA and 5mm slice are the best scanning parameters in low-dose lung scanning and adapt to routine screening and early lung cancer screening.