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Image intensifier distortion correction
Author(s) -
Chakraborty Dev P.
Publication year - 1987
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596078
Subject(s) - image intensifier , distortion (music) , tomosynthesis , imaging phantom , subtraction , optics , projection (relational algebra) , computer science , computer vision , artificial intelligence , image resolution , computed radiography , image quality , physics , image (mathematics) , mathematics , mammography , algorithm , medicine , amplifier , computer network , arithmetic , bandwidth (computing) , cancer , breast cancer
A method is described for determining and correcting the spatial distortion affecting images acquired with image‐intensified video systems. The distortion is separated into two physically distinct components, a predominant one originating from the projection of the x‐ray image onto the curved input phosphor, and a smaller component corresponding to the mapping from the input phosphor to the output phosphor and the digital image matrix. The former is determined geometrically and the latter is modeled with four empirical parameters. A method for determining the two components from calibration images of a grid phantom is presented. The model of the image intensifier distortion was found to be in good agreement with the measured distortion in the images. The correction is applicable to arbitrary angulations of the x‐ray beam with respect to the image intensifier tube, and consequently is directly applicable to digital tomosynthesis. The correction allows one to obtain accurate positional information with fluorography and may also be useful in radiation therapy treatment planning and quantitative digital subtraction angiography.