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Objective To analyze the correlation of the patients body mass index,abdominal anteroposterior diameter(AP),transverse diameter(LR)and anterior abdominal fat thickness(H)with the image quality of upper abdominal CT enhanced scan which used the automatic tube current control technology(caredose4D).Methods Retrospective analysis the image data of one hundred and seventy-eight upper abdominal CT enhanced scan patients who were scanned by SIEMENS 128-slice CT.All patients were scanned tube voltage 120KV,reference tube current 210mAs and the used of automatic tube current control technology(caredose4D).Abdominal anteroposterior diameter(AP),transverse diameter(LR)and abdominal fat thickness(H)was measured in the level of hilar.Records of all patients height and weight and calculate body mass-to-noise ratio(SNR),contrast-to-noise ratio(CNR)to evaluate the image quality of objective.The image quality of subjective was evaluated by two radiologists of high qualification abdominal with 5 points system.Statistics used the Multiple regression analyze the correlation between the patients body mass index(BMI),abdominal anteroposterior diameter(AP),transverse diameter(LR),the anterior abdominal fat thickness(H)and the image quality of upper abdominal CT enhanced scan.Results The image quality of arterial phase and abdominal anteroposterior diameter(AP)were no correlation(P>0.05),transverse diameter(LR)and body mass index(BMI)were negatively correlated(P<0.05),and abdominal fat thickness(H)was po(AP),transverse diameter(LR),body mass index(BMI)were negatively correlated(P<0.05),and abdominal fat thickness were positively correlated(P<0.05).Conclusion The image quality of upper abdominal CT enhanced scan are related to the body mass index(BMI)of the patient,abdominal anteroposterior diameter(AP),transverse diameter(LR)and the anterior abdominal fat thickness(H)with the used of automatic tube current control technology(caredose4D).Therefore,Radiographer should think the patient,s body mass index(BMI),abdominal anteroposterior diameter(AP),transverse diameter(LR)and the anterior abdominal fat thickness(H)as a reference to adju the image quality of upper abdominal CT enhanced scan.