Abstract: To study the dose levels to patient from six main examination types in Hunan province. Using random sampling method, 967 patients were selected as the survey samples in research on the dose to patient receiving the common projection type. The typical dose values to patient were Lumbar(AP) 3.9 mGy,Lumbar spine(LAT) 5.7 mGy,Pelvis (AP) 2.5 mGy,hip joint (AP) 3.8 mGy,Chest (PA) 0.3 mGy,Chest (LAT) 0.7 mGy,thoracic (AP) 1.3 mGy,thoracic (LAT) 3.0 mGy,Skull (PA) 0.7 mGy,Skull (LAT) 0.7 mGy. The doses to Patient from the Chest (PA) and Chest (LAT) are 0.77 mGy and 1.44 mGy when the DR has the function AEC. The doses to Patient from the Chest (PA) and Chest (LAT) are 0.27 mGy and 0.56 mGy when the DR hasn’t the function AEC. The dose to patient receiving six types of X ray examinations by DR is lower than the dose Guidance Level in GB 18871—2002《Basic standards for protection against ionizing radiation and for the safety of radiation sources》in HUNAN province. The function of AEC has positive effect in dose controlling. To some extent,The function of AEC can optimize the dose receiving from X ray examinations by DR.

Key words: digital radiography, dose, typical value