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MR-guided pHIFU (phased High Intensity Focused Ultrasound) system can realize non-invasive ablation of tumors. In order to use MR as the guidance, there must be a precise transfer matrix between the MR and HIFU system. In this paper, some methods are proposed to improve the precision of positioning. One image-processing algorithm is used to automatically pick up the points. Furthermore, this paper...
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