A simplified method for calculating the deficiency of lung perfusion by perfusion scintigrams

The article presents the author’s method of calculating the deficiency of lung perfusion by scintigrams. After perfusion lung scintigraphy with 99mTc-MAA, a zone of both lungs, including defective areas, is outlined on a scintigram in the anterior projection. Determine the average score (A-pulses/cell) in the selected area of interest, including areas of normal and impaired perfusion. Then, the sector of the most perfused portion of the lungs is distinguished in the selected area in the form of an isosceles triangle with a vertex in the middle of the upper, middle, or lower third of the lung image and a base on its periphery. Determine the average score (B-pulses/cell) in the selected triangle with normal perfusion. Such triangular zones can be built 2, 3, 4, take an average of 2-4 definitions. Lung perfusion deficiency in anterior projection=(B-pulses / cell-A-pulses/cell): B-pulses/cell ґ100%. Similarly, the deficiency of perfusion of the lungs is determined by the scintigram of the lungs in the rear projection. The result for both lungs is determined by dividing by two the sum of the deficiency of perfusion of the lungs, calculated by perfusion scintigrams of the lungs in the anterior and posterior projections.

pulmonary thromboembolism, perfusion lung scintigraphy, deficiency of lung perfusion