CORRECTION OF DISPERSION IN SYSTEM OF IMAGE FORMATION WITH MULTITUDE OF TUBES Russian patent published in 2012 - IPC A61B6/03 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, namely to systems and methods of correcting dispersion in formation of image with multitude of X-ray tubes. Method lies in the following: radiation is emitted in a parallel manner from, at least, two X-ray sources, rotating around image formation field and by means of detector sets detected are projection data, which include primary radiation and radiation of cross-dispersion, state of input of each of the two X-ray sources is switched within the multitude of corresponding intervals of cross-dispersion discretisation and by means of one of sets of detectors detected is radiation of cross-dispersion emitted by means of another of, at least, two X-ray sources. Intervals of cross-dispersion discretisation are scattered at angle for many frames. Data of dispersion correction for each set of detectors are taken from corresponding selections of cross-dispersion, data of projection are corrected by dispersion and data of projection are reconstructed in order to form, at least, one image. Computer tomographic system contains at least two X-ray sources, each of which is deactivated within corresponding intervals of cross-dispersion, at least, one detector for each of two X-ray sources is interpolator, which creates selections of dispersion correction from detected selections of cross-dispersion, component of correction and system of reconstruction. In the second version of implementation system contains means of selective switching off of each of, at least, two X-ray sources within corresponding intervals of cross-dispersion discretisation in order to provide possibility for, at least, two X-ray sources to emit radiation in a parallel way during, at least, one frame of data collection, means of radiation detection, means of creating signals of dispersion correction, means of correction by dispersion of projection data by means of dispersion correction data and means of reconstruction.

EFFECT: application of invention makes it possible to increase efficiency of tomographic system due to cross-dispersion correction.

28 cl, 3 dwg