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An Automatic Method for Ultrasound Probe Calibration Based on NPhantom |
Department of Biomedical Engineering, Tsinghua University, Beijing 100084, China |
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Abstract In the ultrasound guided intervention, the imaging plane is tracked using a 3D spatial tracking device, hence it is necessary to determine the transform between the ultrasound probe and the attached position sensor by calibration. The accuracy of calibration has significant impacts on the overall accuracy of ultrasound guidance. The widely used calibration method based on Nphantom requires extracting fiducial points manually in ultrasound images. The conventional manual approach is prone to subjective pickup errors and mistakes in labeling as well as timeconsuming. In this paper, an automatic method, which searches and identifies Nfiducials based on position prediction, is presented. Experimental results showed that the proposed method improves calibration precision to 0.63 mm and accuracy to 1.80 mm, compared to 1.57 mm and 2.66 mm of the conventional method, respectively. The average processing time on each frame is 0.067 s, which is much less than that of manual processing.
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