Figure 5: Application of the FINE method to a fetus with a normal heart (static mode volume) and maestro navigation of cardiac diagnostic planes.

A static mode volume was acquired in which the fetal spine was originally located between 4 and 5 o’clock. Therefore, a spine location alert and Volume Orientation message appeared on the screen. Reorientation occurred so that the fetal spine was placed at 6 o’clock. The marking process continued, and nine normal cardiac diagnostic planes in a single template were depicted by FINE. Next, maestro navigation was used to fine-tune three planes (one at a time): 1) left ventricular outflow tract; 2) short axis of the great vessels / right ventricular outflow tract; and 3) ductal arch. The resulting nine cardiac diagnostic planes with the unique feature of automatic labeling (through intelligent navigation) of each plane, anatomic structures, fetal left and right sides, and cranial and caudal ends are depicted (also see Video S8). A, transverse aortic arch; Ao, aorta; Desc., descending; IVC, inferior vena cava; LA, left atrium; LV, left ventricle; P, pulmonary artery; PA, pulmonary artery; RA, right atrium; RV, right ventricle; RVOT, right ventricular outflow tract; S, superior vena cava; SVC, superior vena cava; Trans., transverse