Fig. 4.
Upper: An example of the ZY plane of a 3D US volume with the baseline in magenta of FA (left) and MA (right). Lower: A plotted representation of the gradient of the phantom's surface. Because the cable from the US system is horizontally attached to the transducer and the water well is attached to the phantom, acquiring an image in the XY plane is limited for the moving range. This moving range was larger with FA as the operator could adjusted the angle of the transducer not to be perpendicular to the phantom so the cable was less blocked by the water well
