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Fig. 7 —Photograph shows transducer designed with rotation capabilities contained within housing. End result is similar to Figure 5, but rather than having a separate device to hold transducer, transducer itself has electronic steering that steers in rotational pattern. Design is also similar to transesophageal echocardiography transducer shown in Figure 1. (Courtesy of Philips Medical Systems, Andover, MA and Bothell, WA)