Fig. 3
From: Ultrasound-based incidence of coarctation of the aorta in true and false positive fetuses
Parameters measured on ultrasound images. (A) The transverse aorta (1) and the aortic isthmic (2) diameters were measured on the 3 vessel trachea view, with the transverse aorta diameter of 0.25 cm and the isthmic diameter of 0.22 cm. (B) The aorta (AO) diameter at the aortic valve annulus and the ascending aorta (AAO) diameter were measured at the left ventricular outflow tract section, with the AO diameter (1) of 0.35 cm and the AAO diameter of 0.35 cm. (C) The aortic arch diameter was measured at arch 1 before the brachiocephalic artery (BA), arch 2 before the left common carotid artery (LCCA) and arch 3 before the left subclavian artery (LSA). (D) The DA-isthmus angle was measured on the HD Live Flow image on the sagittal view, with the DA-Isthmus angle of 16.16°. (E) The DA-isthmus angle was measured on the 3D STIC HD Live Flow image viewed from the superior aspect, with the DA -Isthmus angle of 36.70°. (F) Displacements 1–3 were measured on the 3D STICK-HD Live Flow image. Displacement 1: the vertical distance between the LSA origin and the outer edge of the descending aorta (DAO), displacement 2: the vertical distance between the aortic arch import point on the aorta (or isthmus-DA junction) and the DAO outer edge, and displacement 3: the vertical distance between the LSA origin and the Isthmus-DA junction. DA ductus arteriosus; MPA main pulmonary artery; SVC superior vena cava; ISTH aortic isthmus.
