Abstract: ［Abstract］ Objective〖HTSS〗〓To investigate the application and quality control measures of bedside chest digital radiography(DR) in acute myocardial infarction.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓A total of 100 patients with acute myocardial infarction and  photographic parameters were equally divided into noquality control group and quality control group. The photographic parameters of the noquality control group were 93 kV/1.6 mAs, 88 kV/2 mAs, etc., randomly selected. Exposure in eupnea, the exposure field was set to the maximum, the flat panel detector was placed on the back including the chest, and the received image was simply processed. The quality control group, the exposure parameters of 79-81 kV/1 mAs, 84-85 kV/1 mAs, 88-89 kV/1 mAs and 93-96 kV/1 mAs were selected according to the lean, medium, fat and obese body types. The technology of adjusting and controlling ultrashort exposure time was used to improve the exposure mode. The patients were exposed in breathholding state after deep inhalation. The irradiation field was controlled reasonably. The detector plate was placed flat under the patient′s back. By optimizing and adjusting the parameters of image postprocessing, the best combination of parameters was found and the obtained image was postprocessed.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The radiation doses received by patients of each body type in quality control group were significantly lower than those of the noquality control group. Especially lean patients receive the most radiation dose. The difference between the two groups was statistically significant(P＜005). The image quality of the quality control group was significantly higher than the noquality control group .The first film rate(scores 10) is 80.0%(40/50). The unqualified film is 0, while the noquality control group ,the first film rate(scores 10) is only 14.0%(7/50), the top quality film accounts for 24.0%(12/50), the unqualified film is 20.0%(10/50), The difference scores between the two groups was statistically significant(P＜005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓The two methods were compared, after quality control, the radiation dose of bedside chest DR in acute myocardial infarction disease was significantly reduced, and the image quality was greatly improved, should be applied widely.

Key words: myocardial infarction； radiography, radiation dosage