TY JOUR TI Effect of Correction of Gamma-Radiation Absorption in the Study of Myocardial Perfusion by SPECT/CT KW SPECT/CT KW gamma-ray emission KW absorption correction KW microvascular angina KW myocardial perfusion JO Medical Radiology and radiation safety AU Hachirova, E.A. AU Samoylenko, L.E. AU Shevchenko, O.P. PY 2017 IS 62 PB Federal Medical Biological Agency of Russia