抄録
An additional filter on the collimator of X-ray tube is useful to reduce exposure dose during x-ray fluoroscopy in interventional radiology(IVR). In this study, exposure doses to the patients and operators were measured after creating differential image qualities using an additional filter. We made an additional filter(spot filter)consisting of a copper sheet with an open hole in the center. The quality of the fluoroscopic image, the exposure dose and tube loading were measured at different thicknesses of the spot filter in a phantom study. Using this filter, the image quality was improved at the target region of the image intensifier(I.I.), because scatter radiation was attenuated at the periphery. Although image quality deteriorated at the periphery, there was no significant disadvantage for IVR. By keeping x-ray tube loading as low as possible, exposure dose to the patient and scatter dose to the operator could be decreased further.
