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♦ The intersection between the CIA centerline and the plane at the aortic bifurcation (O) defines the starting points of the CIAs, denoted as PL and PR. The angle between the left and right CIAs is determined by use of CIA vectors, defined from the starting points (PL and PR) to a distal point on the CIA centerline in 5-mm increments. Ten pairs of aortic bifurcation angles are compared between the supine and fetal positions.
