Stock Photo - Three_dimensional Computed Tomograpgy CT scan of the the chest showing mapping of a radiotherapy treatment of esophagus cancer yellow. The collimated frame shows the area to be irradiated. Radioprotector screens protect the health lungs tissus. In green is the spinal cord. Radiotherapy is a surgical procedure widely used from cancer treatment because noninvasive : X_rays are focused on the cancerous area , the nearby structures are not affected by radiations.

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