[en] The authors have developed an adaptive filtering method for scattered x-ray correction in a digital subtraction angiographic system, based on the following experimental results: (1) When the x-ray grid was applied in front of the image intensifier, the configuration of point spread function (PSF) for scattered radiation was independent of the water phantom thickness (5-25 cm) and the distance between the phantom and the image intensifier (0-25 cm); The distribution of the scattered x-ray (S) was represented by S = (a . P/sup n/ + b . P) * (PSF), where * denotes convolution, P is the primary distribution, and a, n and b are estimated from exposure conditions; (3) The original image (T) is described by T = P + S. A practical method of scatter correction and its pertinence for clinical imaging is presented