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Example of a patient at week 1 and week 3 during radiation therapy, which illustrates the change in bronchus position. The primary tumor is shown in red (thin line week 2, thick line week 4) and bronchus is in green (thin line week 2, thick line week 4). Bronchus and the primary tumor center of mass shifted medially 0.9 cm and 1.8 cm, respectively. For color images, please access the electronic version of this figure.
