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Measurement of ductal size on 2D and color Doppler on high left parasternal “ductal view.” (A) Showing significant discrepency between ductal diameter measurement on 2D and color Doppler—over-estimation of ductal size on color Doppler because of gain setting; (B) showing no significant discrepency between ductal diameter measurement on 2D and color Dopple after optimisation of gain setting. LPA, left pulmonary artery; RPA, right pulmonary artery; PDA, patent ductus arteriosus.
