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Main-graph chart diagrams. The main-graph chart diagrams were obtained from the fetal cardiac ultrasound screening video of a normal case (a) and tetralogy of Fallot case (b). The dots circled in gray correspond to each kernel, and these dots are connected as the kernel moves. Several points correspond to the typical diagnostic planes. The four-chamber view (4CV) and three-vessel trachea view (3VTV) are shown as blue diamond and red square points, respectively.
