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Fig. 1 —Diagram shows virtual CT sonography system composed of main
unit, body of magnetic location detector unit, magnetic field generator, and
magnetic sensor attached to sonographic transducer. In magnetic field, spatial
information from transducer is only relative relation between magnetic
generator and magnetic sensor. Common point between sonographic image and CT
volume data can be set, and virtual CT sonography shows image corresponding to
movement of transducer in magnetic field. MPR = multiplanar reconstruction; X,
Y, and Z = axes.