Abstract: Objective: Because the traditional loop of breathing control and regulation effect on blood circulation, there was rare study of pulmonary vein capacity.We need a noninvasive and accurate pulmonary vascular capacity measurement and analysis method. Methods: Twelve normal volunteers were performed a total lung CT scan, image data analysis processing by computer software, the whole lungs from the apex to the base of lung with 40~50 layers by hand-cut, the connection between adjacent layers automatically by a computer simulation, the full pulmonary vascular (≥0.6 mm) were treated by high-accuracy three-dimensional imaging technology after removing the interference, and then calculate the whole lung and pulmonary vascular. Results: The whole lung of the 12 normal volunteers from the apex to the base of lung CT scan image layers was 530±98(range, 431~841). The total capacity of lung and pulmonary vascular blood was 3705±857(range, 2398~5383)ml, and the total volume of the pulmonary vascular blood was 125±32(range, 94~201)ml. The pulmonary vein vascular blood volume was 63±16(range, 47~100)ml. Conclusion: The method of measuring the three-dimensional imaging of pulmonary vascular capacity by analyzing lung CT scan data is available and accurate.

Key words: lung CT scan, total capacity of the pulmonary vascular, pulmonary vascular tree, pulmonary vein blood volume