ABSTRACT
Objective To compare the image quality, radiation dose and diagnostic accuracy on film-screen, digital radiography (DR) and computed radiography (CR) mammography. Methods Three different kinds of mammography machines (film-screen, DR and CR) were tested to make sure they were qualified and comparable. Radiographies were taken on Mammo-152 phantom and ACR phantom using filmscreen, DR and CR systems with the same radiation dose. Next, radiographies were taken on two phantoms using DR and CR systems with classic mode or AEC and the radiation dose was recorded. The images were numbered and scored by eight independent experienced radiologists under the same reading condition according to ACR method. Statistics was performed with the randomized complete-block design variance analysis. The diagnostic accuracy of three kinds of mammography methods were compared with Kappa test in clinical cases who had pathologic results. Results The spacial resolution of film-screen system was the highest (7.0-8.0 Lp/mm) and that of CR was the lowest (2.5 Lp/mm). When the radiation dose was increased (27. 0%-30. 0% ), the resolution was improved with DR ( +11. 0% ) but almost no change with CR ( +1.5%). The radiation dose of DR was the lowest on ACR phantom. The delineation of mass was better on film-screen than on CR, but the delineation of fibers and speck was better on CR. When the radiation dose of CR was increased (25. 0% ), the delineation of fibers and speck on CR was similar to that on DR and the delineation of mass was similar to that on film-screen. There was a good correlation between the mammography diagnosis and pathological results (film-screen is 50/56, DR is 83/90 and CR is 61/69,P < 0. 01 and Kappa value > 0. 75) . The diagnostic accuracy of three mammography systems had no statistical difference [film-screen 89. 3% (50/56), DR 92. 2% (83/90) and CR 88. 4% (61/69),Pearson X 2=0. 722 ,P =0. 697]. Conclusion Film/screen system has the highest space resolution and DR has the lowest radiation dose. Three mammography systems have the same diagnostic accuracy for breast disease.
ABSTRACT
@#ObjectiveTo explore the current status of physical exercise of older adults and its effect on depression.Methods270 subjects from three living strata(public,community and hospital) were randomly investigated by the Geriatric Depression Scale-short form(GDS-s) and the self-designing Geriatric Exercise Scale.ResultsOlder adults had a higher risk of suffering from depression.There were significant differences between attitudes and prevalence rates among the subjects in three environments.Exercises had significant influence on older adults' depression,with the more negative attitude,less frequency,shorter exercising time,less companions,worse feeling after doing exercises,the more serious of one's depression.The demographic variables had also significant influence on both exercise and depression of older adults.ConclusionDoing exercise is one of the important measures to prevent,reduce and overcome depression of older adults.
ABSTRACT
Objective To evaluate the reliability and clinical application of measuring blood glucose and urea with electrodes and end reaction methods. Method Using the electrodes and end reaction methods, blood glucose and urea were measured respectively. The results and the relativity between the two methods were compared. Result Comparing the two methods for GLU and UREA, the correlative factors were 0.990 1 and 0.989 1 respectively. They had fairly good comparability. The linear ranges of their regression equations met the clinical needs. With favorable accuracy, the correlative factors were above 0.997 9. Conclusion The electrodes method was rapid and accurate, which was suitable for emergency tests. The ending reaction methods was fairly stable and has less interfering factors, which was fit for the routine use.