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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.