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Proceedings Paper

Ultrasound-directed robotic system for thermal ablation of liver tumors: a preliminary report
Author(s): Jian Zheng; Jie Tian; Yakang Dai; Xing Zhang; Di Dong; Min Xu
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Paper Abstract

Thermal ablation has been proved safe and effective as the treatment for liver tumors that are not suitable for resection. Currently, manually performed thermal ablation is greatly dependent on the surgeon's acupuncture manipulation against hand tremor. Besides that, inaccurate or inappropriate placement of the applicator will also directly decrease the final treatment effect. In order to reduce the influence of hand tremor, and provide an accurate and appropriate guidance for a better treatment, we develop an ultrasound-directed robotic system for thermal ablation of liver tumors. In this paper, we will give a brief preliminary report of our system. Especially, three innovative techniques are proposed to solve the critical problems in our system: accurate ultrasound calibration when met with artifacts, realtime reconstruction with visualization using Graphic Processing Unit (GPU) acceleration and 2D-3D ultrasound image registration. To reduce the error of point extraction with artifacts, we propose a novel point extraction method by minimizing an error function which is defined based on the geometric property of our N-fiducial phantom. Then realtime reconstruction with visualization using GPU acceleration is provided for fast 3D ultrasound volume acquisition with dynamic display of reconstruction progress. After that, coarse 2D-3D ultrasound image registration is performed based on landmark points correspondences, followed by accurate 2D-3D ultrasound image registration based on Euclidean distance transform (EDT). The effectiveness of our proposed techniques is demonstrated in phantom experiments.

Paper Details

Date Published: 12 March 2010
PDF: 8 pages
Proc. SPIE 7629, Medical Imaging 2010: Ultrasonic Imaging, Tomography, and Therapy, 76290Z (12 March 2010); doi: 10.1117/12.843881
Show Author Affiliations
Jian Zheng, Medical Image Processing Group, Institute of Automation (China)
Jie Tian, Medical Image Processing Group, Institute of Automation (China)
Yakang Dai, Medical Image Processing Group, Institute of Automation (China)
Xing Zhang, Medical Image Processing Group, Institute of Automation (China)
Di Dong, Medical Image Processing Group, Institute of Automation (China)
Min Xu, Medical Image Processing Group, Institute of Automation (China)


Published in SPIE Proceedings Vol. 7629:
Medical Imaging 2010: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Stephen A. McAleavey, Editor(s)

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