Fig. 3From: Comparison of transthoracic echocardiography with computed tomography in evaluation of pulmonary veinsLearning curve of obtaining transthoracic echocardiographic images of pulmonary veins (PV). The X axis refers to the first 50 consecutive study patients who had been imaged by one of the echocardiographer (Q-Q.D.). The Y axis presents the average time spent on obtaining the optimal views to measure PVs per five casesBack to article page