DUAL ENERGY ROENTGENOGRAPHY METHOD (EMBODIMENTS) Russian patent published in 2020 - IPC A61B6/00 

FIELD: medicine.

SUBSTANCE: declared group of inventions refers to medical X-ray equipment and can be used for examination of patients with various diseases, including oncological diseases. Method for dual-energy X-ray radiography involves irradiating a patient with X-rays as a result of feeding two voltage pulses of different magnitude to an X-ray source, obtaining two corresponding initial X-ray images and constructing on their basis separate images of tissues having different coefficients of linear attenuation. Not earlier than the middle of the first exposure interval, a high-voltage pulse is supplied, and in fact, simultaneously with the beginning of the second exposure interval, a low-voltage pulse is supplied. Before constructing separate images of tissues having different coefficients of linear attenuation, performing combination of two initial images by correcting one of them, for which sequence of compressions of initial X-ray images is performed k_p times, where k_p is current compression ratio along each direction, selected from: k₁ ≥ k₂ ≥…> ≥ k_p-1 ≥k _p≥ k_p+1…k_P, displacement vectors finding Δr_p(i,j) of each pixel with coordinates i,j, where i=1…N_p, j=1…M_p, a N_p×M_p is the size of each of the compressed images. According to the first embodiment, a sequence of formations is performed from a set of said displacement vectors Δr_p(i,j) displacement maps Δr in scale of initial images and obtaining the current corrected image by shifting the previous corrected image according to the current displacement map until the final corrected image is obtained. According to the second embodiment, formation of a set of said displacement vectors Δr_p(i,j) of displacement map Δr in scale of initial images with its subsequent updating until obtaining final displacement map and obtaining the corrected image by shifting the original image according to the final displacement map.

EFFECT: group of inventions provides reduction of motion artefacts on obtained separate images, both by reducing the effect of probable movement of the patient during diagnostic examination, and by compensating for the effect of the residual effect of such motion on the information content of these images.

2 cl, 2 dwg