[New single-photon emission computed tomograph].

The "OFEKT-1" emission tomograph, worked out on the basis of gamma camera, is described. The results of technical and medical testing of the tomograph are presented.

[Study of the effect of arterial hypertension on the status of left- ventricular myocardium based on thallium-201 scintigraphic data].

Functional relationship was examined between the parameters of myocardial perfusion, left ventricular myocardial mass, and complications developed in patients with coronary heart diseases concomitant with arterial hypertension. Examination was made of 102 patients with various natural history of arterial hypertension, of whom 53 had concomitant angina pectoris, myocardial infarction, congestive heart failure, sudden death, or rhythm disturbances. As "perfusion deficiency" progressed, the patients with complicated natural history of arterial hypertension were found to increase in number with higher left ventricular myocardial mass index.

[Method of radionuclide determination of the right ventricular ejection fraction].

The authors developed a method of evaluation of the right ventricular (RV) ejection fraction based on the use of the left oblique projection for visualization of the right ventricle, separation of the RV contour into the systole and diastole, and subtraction of the surrounding tissue background calculated by a distance-dependent method. The proposed algorithm was shown to be versatile in evaluation of the background for RV and LV investigations. The results of determination of the RV ejection fraction in patients with chronic pulmonary hypertension of III-IV degree were suggestive of a significant decrease in RV contractility of these patients as compared to controls.