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Rotating is another movement where the probe stays on the same external point on the patient; however, the angle of insonation is not changed in any plane. The probe is turned about its long axis. Picture a clock dial with the probe perpendicular to the face. The probe may be rotated either clockwise or counterclockwise (Bahner et al. 2016); however, to maintain the same imaging as a ventrodorsal radiograph, rotate counterclockwise (to the left).

Figure 4.7. Fanning. The position of the probe is not moved on the patient and the angle of insonation is changed only in the transverse plane.

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

Figure 4.8. Rotating. The probe remains on the same focal point of the patient as with rocking and fanning. During rotating, the angle of insonation is not changed in any plane. The probe is turned about its axis in either a clockwise or a counterclockwise direction.

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

Figure 4.9. Sliding. The probe is moved across the body in the longitudinal axis of the patient, and the angle of insonation in relation to the patient's body is not changed.

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

Pearl: Rocking, fanning, and rotating are on the same fixed external point on the patient; however, the angle of insonation is changed with rocking and fanning (but not rotating).