RESUMEN
Objective To study the test equipment for digital X -ray photograph and to check the efficiency of X -ray equipment. Methods CR and DR were checked respectively. Results Slice numbers of aluminum ladder by CR was fewer than that by DR. The accuracy was improved with the value over 90% after the use of measuring scale. Conclusion Width and low contrast for DR is higher than those of CR and measuring scale error is less than 1 millimeter.
RESUMEN
Objective To discuss a method to show the structure of small mammary gland well by computed radiography(CR).Methods By analyzing 150 radiographs of mammary glands,the results showed that the mammary structure showed well whether or not was depended on the size of mammary gland.Using 24 steps aluminum ladder mimiced the small mammary gland and radiography was taken with various parameters and different imaging plate(IP) shading ways,then processed and printed,after that it was measured by density instrument.Results The display of grey scale of 24 steps aluminum ladder was improved if shading 10~15 mm margin of the IP by collimator or shading the central by a square cuprum plate with 22 mm length and 0.2 mm thickness.Radiography of small mammary gland by the same way was performed and the mammary structure was also showed well.Conclusion Shading the exposing areas properly by collimator or cuprum plate during CR can apparently improve the display of small mammary structure.