Abstract
The bloodstream system of the pulmonary field consists of two systems: pulmonary arteries pass and aorta pass. Until now, the influence of recirculation has been excluded by fitting a gamma function, because the recirculation from aorta is less than 10 percent of the blood flow from pulmonary arteries. In this study, we consider the way to estimate influence of recirculation by modeling the impulse response of a blood flow system that consists of 2-inputs with pulmonary arteries pass and aorta pass firstly, and we propose the way to analyze two blood flow systems separately. An experimental prototype system using these methods was applied to three cases with pulmonary tumor. Furthermore, we compared the global blood volume of the whole pulmonary field inferred from the signal intensity of the pulmonary arteries and the left atrial, with the total of the local blood volume of the whole pulmonary, by using perfusion MRI. The validity was considered by comparing the percentage of the recirculation which occupies a pulmonary field with the cardiac output volume calculated using Fast GE cine MRI.