#$%^&*AU2008200421B220121206.pdf#####ABSTRACT A calibration apparatus includes a motion assembly, which is arranged to move an imaging probe through a calibration point having known coordinates. The imaging probe includes an ultrasound transducer and a position sensor for acquiring 5 concurrently a first sequence of ultrasound images and a second sequence of position measurements. The apparatus further includes a marking circuit, which is arranged to mark an ultrasound image that is acquired by the ultrasound transducer in the first sequence when the imaging probe is at the calibration point. A processor is arranged to calibrate a time offset between the first and second sequences by associating the 10 marked ultrasound image in the first sequence with a position measurement in the second sequence whose coordinates match the coordinates of the calibration point. 29101/08.kn 17136 - spcification,222/5 FIG. 2 40 4 (28 32-46 33 FIG. 3 20 34 50? 36 57 POSITIONING CALIBRATION PROCESSOR PROCESSOR IMAGE ELECTRO-MECHANICAL PROCESSOR ASSEMBLY 42 (59 28
