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(A–D) Active microcoil (arrow) tracking of brachytherapy stylet. The trajectory (yellow points) represents consecutive tracking positions overlaid on previously acquired images. (From Wang W, Dumoulin CL, Viswanathan AN, et al. Real-time active MR-tracking of metallic stylets in MR-guided radiation therapy. Magn Reson Med 2015;73(5):1810; with permission.)
