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Mentions: In 6 cases of HCC, we evaluated the tracking system according to the tumor size, and the tracking of the tumor larger 3cm in diameter were successfully performed in all cases (n=2). On the other hand, the tracking of the tumor smaller than 3cm were performed successfully in 3 out of 4 cases. The reason for motion trackings were not performed well was thought to be that the tumor contour became unclear because the maximal cross section of the tumor go out of the plane by the respiratory movement. By using the video images during the FUS treatment (Fig. 1, Fig. 2), we evaluated the respiratory tracking, and the tumor was successfully tracked. And the tumor after FUS treatment was also tracked well even after the presence of the hyperecho around the tumor (Fig. 3, Fig. 4). In conclusion, the respiratory motion tracking using template matching method was successfully performed and have a possibility to shorten the FUS treatment time.
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