Limitations
The limitation of the study includes race and ethnicity were not reported because of the limited data use agreement among centers in which this information could not be collected. The 1 to 2 year-old patients were difficult to recruit as they were the most uncooperative patients and frequently cannot breath hold for image acquisition. We did not record the amount of time we spent in acquiring the LV 3D datasets as this can be quite variable depending on the state of the child’s cooperation. However, the post-processing using semi-automated contouring is feasible once a good dataset is acquired and does not consume large amount of time making this clinically feasible to use.