METHOD AND DEVICE FOR DETERMINING DENSITY OF SUBSTANCE IN BONE TISSUE Russian patent published in 2011 - IPC A61B6/00 G01N23/203 G01B15/02 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to radiodiagnostics of bone tissue state, and can be used in determination of such diseases as osteoporosis and osteopathy. Method includes irradiation of bone tissue by collimated beam of gamma-radiation, movement of gamma-radiation source and detector with movement of irradiation zone into bone tissue depth, registration of reversely dispersed irradiation with respect to falling beam and determination of substance density. Energy of gamma-irradiation photons is selected within the range from 50 keV to 1 MeV. Movement of gamma-irradiation source and detector is carried out by layer-by-layer displacement of zone of reversely dispersed irradiation. In addition, distribution of substance density along axis of probing is obtained by calculation of density in second measurement for second layer of substance and all following dimensions of layers to n-th one, by value of density, obtained in first measurement for first layer and all measurements for (n-1) layers. Device consists of patient's extremity fixer, gamma-irradiation source, collimator and detector of dispersed gamma-irradiation, combined into rigid assembly, moved by movement device along symmetry axis with displacement of irradiation zone into bone tissue depth. Movement device includes electric drive, connected by means of mechanic transmission links with rigid assembly.

EFFECT: application of invention will make it possible to probe bone tissue to essential depth and ensures more accurate determination of substance density distribution alone axis of probing.

4 cl, 2 dwg, 1 tbl, 1 ex