In ultrasonic volume imaging, the effect of rotating the transducer ab
out the central axis of the imaging plane is equivalent to rotation of
the insonified volume. The authors present schematics to depict the a
ction and sonograms in two cases (a hand immersed in water and a 36-we
ek fetus) to demonstrate this phenomenon. This maneuver can be used to
''rotate'' the imaged structures, which enhances their three-dimensio
nal representation.