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Rocking is best visualized with a curvilinear probe, a back‐and‐forth movement of the probe. Imagine a rocking horse or rocking chair. The position of the probe is not moved on the patient and the angle of insonation is changed only in the longitudinal plane. The rocking movement allows an object being visualized to be in the center of the screen (Bahner et al. 2016). A simple way of determining which way to rock the probe is this: if the object in the longitudinal plane is towards the cranial side of the screen (left side), rock the probe to direct it more cranially, and conversely, if the object is towards the caudal side of the screen (right side), rock the probe to direct it more caudally. Similar motions apply when scanning in the transverse plane.

Figure 4.6. Rocking. The position of the probe is not moved on the patient and the angle of insonation is changed only in the longitudinal (sagittal) plane.

Source: Illustration courtesy of Randi Taggart, Richmond, VA.