Usefulness of Digital Radiography with Added Filter

Abstract

Dose reduction is one of the important features of digital fluorography systems. Dose reduction was examined by using an added x-ray filter, and its influence on image quality was determined. We concluded that a 0.2mm Cu filter is best, considering the balance of exposure and exposure time, spatial resolution, and density resolution. Using the 0.2mm Cu filter, the entrance exposure to the patient was reduced by 45-55% for radiography and 50-60% for fluoroscopy, but exposure time increased 30-35%, fluoroscopic tube viltage increased 5-6%, and fluoroscopic tube current increased 9-10%. Clinical image quality was not sacrificed by using the added x-ray filter. The use of an added filter is an effective means to reduce patient exposure, but it is important to consider the load on the x-ray system and its influence on the image quality.