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[The isolation of the contribution of the parenchyma to the radionephrogram and the assessment of kidney purifying function].

The authors described the principle and algorithms of the separation of a summary radionephrogram into constituents, reflecting the contribution of a radiopharmaceutical, uptaken by neutrons, and RP in the surrounding tissues. The authors proposed a correct method for estimation (using the first constituent) of the efficacy indicator of RP uptake by the kidneys (Q-parameter) and the indicator of the mean time of transit (t) in the kidneys of RP uptaken by their parenchyma. The results of testing of the proposed methods of Q and t calculation were presented. Values of these parameters were determined in health and in essential hypertension, I and II degree, pyelonephritis, chronic nephritis (latent and hypertensive types), stenosis of the renal artery, obstruction of the upper urinary tracts, and in one kidney. These results indicate the physiological adequacy of the employed mathematical models, proving the diagnostic informative value of the calculated indicators.