METHOD OF OBTAINING A THREE-DIMENSIONAL IMAGE OF AN OBJECT CONTAINING METAL INCLUSIONS IN COMPUTED TOMOGRAPHY Russian patent published in 2023 - IPC A61B6/00 G01N23/46 G06T7/143 

FIELD: medical X-ray technology.

SUBSTANCE: invention can be used in computed tomography, including low angle cone beam tomography, to obtain an informative three-dimensional image in cases where the object of study contains metallic inclusions. To obtain a three-dimensional image of an object containing at least one metallic inclusion, an array of projection images of the object is obtained, each of which corresponds to a certain shooting angle. An array of two-dimensional maps of the probability of the presence of metal is obtained. An array of two-dimensional binary metal masks is obtained. A three-dimensional map of the probability of the presence of metal is obtained. A three-dimensional binary mask of the metal and its traces is obtained. A three-dimensional binary mask of the metal is obtained. An array of projection images without metal is obtained. A three-dimensional image of an object without metal and its traces is reconstructed from an array of projection images without metal. A three-dimensional image of the metal and its traces are reconstructed and the obtained three-dimensional image of the object without metal and its traces are combined with the obtained three-dimensional image of the metal and its traces to obtain the final three-dimensional image of the object. To reconstruct a three-dimensional image of metal and its traces, a three-dimensional image without metal and its traces are taken as an initial approximation and, using an array of projection images, iteratively refines the desired three-dimensional image, updating at each iteration the signal values only in the voxels of the metal and its traces.

EFFECT: invention makes it possible to significantly reduce the number of metal artifacts in a three-dimensional image of an object with relatively little time spent on their suppression.

16 cl, 4 dwg