Real-time tumor tracking is a task of growing importance due to the increasing availability of modern linear accelerators paired with MR imaging, called MR-LINAC. Physiological motion can thereby impair focal treatment of moving lesions.Classical tracking approaches often work inadequately because they operate only at the pixel level and thus do not include image-level information.Contrarily, learning based tracking systems typically require a large, fully-annotated dataset which is an arduous task to create. In this work, we propose a framework for example-based single-shot tumor tracking, which is trained without presence of labels and investigated for lesion tracking under respiratory motion.
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