FIELD: measuring.
SUBSTANCE: invention can be used for calibrating an X-ray source. Essence of the invention consists in the fact that the X and Y coordinates characterizing the position of the geometrical centre of the X-ray source in the plane of rotation for all moments of time for recording the projections by the tomograph detector are determined; then, phantom is scanned. Said phantom comprises working elements made from radio-opaque material, mounted on an arched base made of a polymer base and arranged between source trajectory and X-ray detector so that shadows cast by working elements of the phantom closest to the radiation source fall on the tomograph detector and on the obtained image did not go beyond the edges of the image and did not intersect; based on phantom images obtained after scanning, as well as obtained coordinates of the position of the geometric centre of the radiation source in the plane of its rotation and coordinates of the detector elements, determining the coordinates of the centres of the shadows of the working elements of the phantom on the projection images and the Z coordinate of the radiation source, which characterizes its position along the axis perpendicular to the plane of its rotation, for all moments of time of registration of projections by detector, and three-dimensional coordinates of centres of elements of phantom; based on images of projections obtained after scanning the phantom, as well as three-dimensional coordinates of the radiation source for all moments in time of recording projections by the detector and coordinates of centres of working elements of the phantom, determining the radial and azimuthal dimensions of the X-ray source on the anode of the tomograph for all moments of time for recording projections by the detector of the tomograph.
EFFECT: possibility of reducing errors when determining dimensions of an X-ray source.
14 cl, 4 dwg
