Decrease of radiation dose to patients and its management is important for modern radiographic imaging procedures. Computed radiography (CR) provides broader dynamic range and high potential for post-processing, lower radiation dose while maintaining usual image quality could be promoted. There is sufficiency of experiments, which finds clinical possibilities of patient dose reduced from usage of CR systems. However the experiments correlating radiation dose and x-ray image quality have not been found. Therefore the current research is directed to find ways to reduce patient dose keeping up the quality of x-ray image using CR system. The quality of image was evaluated as the contrast and lateral resolution. The Plexiglas phantom and test plate “ETR-1” were in use as the radiated objects. The x-ray machine “Bucky Diagnost” was employed to supply radiation flow. The digital images were provided both the Automatic Exposure Control (AEC) and manual modes. The voltage range from 40 to 90 kV was in use. The radiation dose was varied because of the mAּ s control. The dose was estimated because of detected Air Kerma (microGyּ m2) by the DAP meter. The results demonstrated that the dose could be decreased on for 40-75% keeping the quality of image.