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(a)–(d) Artificially generated 2D cine MR images. Overlaid are the ground truth and adapted lung tumor contours as well as the static peak-exhale and mid-ventilation contours from the first scan. In all examples, the slice acquisition strategy and 2Dsingle template generation strategy were used. For very small tumors, localization sometimes failed using low-resolution images due to the tumor-to-background-contrast.
