METHOD OF ASSESSING MYOCARDIAL PERFUSION RESERVE USING A SINGLE PHOTON EMISSION TOMOGRAPHY SYSTEM WITH NaI CRYSTALS WITH CT RADIATION ABSORPTION CORRECTION Russian patent published in 2023 - IPC A61B5/02 G01T1/161 

FIELD: medicine; clinical cardiology; radiodiagnostics.

SUBSTANCE: invention can be used to determine myocardial perfusion reserve (MPR). Single-photon emission computed tomography (SPECT) with CT correction of radiation absorption at rest and after a stress test is performed according to a two-day protocol using a radiopharmaceutical (RP)^99m Tc-MIBI. In this case, the study is carried out using the SPECT system with NaI-crystals. The share of accumulation of radiopharmaceuticals in the myocardium at rest and after the stress test is calculated. The proportion of radiopharmaceutical accumulation in the myocardium is calculated by the formula: C=N_total/(N_myoc*P)*100%, where C is the proportion of radiopharmaceutical accumulation in the myocardium, N_total is the number of pulses in the detector field of view, N_myoc is the number of pulses in the myocardium, P is the number of projections. RMP is calculated by the formula: R=C_load/C_rest, where R is MPR, C_load is the proportion of radiopharmaceuticals in the myocardium after a stress test, C_rest is the proportion of radiopharmaceuticals in the myocardium at rest.

EFFECT: method provides an accurate assessment of MPR on the devices of the traditional SPECT system with NaI-crystals.

1 cl, 4 dwg, 1 tbl, 1 ex