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Objective To investigate the clinical value of DSCT preoperation in the assessment of the pulmonary arteries in the complex congenital heart disease with diminished pulmonary blood flow and compared with echocardiography.Materials and methods 79 patients schedules for operation because of suspected or definite complex congenital heart disease with diminished pulmonary blood flow were examined both DSCT and ECHO.3 aspects reflecting pulmonary artery developmental capacity were concerned, including the pulmonary artery trunk, left pulmonary artery and right pulmonary artery, whose results were subjected to statistical analysis using Pearsons correlation and t-test analysis compared with that of echocardiography.