METHOD FOR GENERATING COMPOSITE IMAGE FROM SERIES OF ANGIOGRAPHIC DIGITAL SUBTRACTION FRAMES Russian patent published in 2017 - IPC A61B6/00 G06T5/50 

FIELD: physics.

SUBSTANCE: method includes: obtaining a series of angiographic digital subtraction frames, isolating a basic set of diagnostic significant subtraction frames from the series of angiographic digital subtraction frames, forming a composite image from the basic set of the diagnostic significant subtraction frames. For each position of the composite image, a predetermined luminance value of the pixels corresponding to this position on the frames of the basic set of the diagnostic significant subtraction frames is determined and the brightness of the composite image element located at the given position is determined in accordance with the detected luminance value. A set of corrected frames from the series of the angiographic digital subtraction frames is selected, limited to the frames corresponding to the reference time points associated with phases of physiological cycles in the patient's body. Before generating the composite image, the brightness for each frame from the set of the corrected frames is adjusted according to the luminance distortion factor for each image, where the maximum image brightness distortion factor is aligned with the frame corresponding to the moment of maximum capillary filling, the minimum image brightness distortion factor is put in correspondence with the first and the last frame of the set of the corrected frames, the factors of the image brightness distortion for other set frames of the corrected frames are obtained by interpolation. At least, one additional set of the diagnostic significant subtraction frames is allocated, for each of which a composite image is formed. The composite image for the series of the angiographic digital subtraction frames is formed by combining composite images by averaging the brightness of elements located at coincident positions of the composite images.

EFFECT: method allows to save a small amount of contrast medium introduced into the patient's vascular system as the diagnostic value of the image increases.

6 cl, 8 dwg