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A Top) A left upper lobe lesion (shown in cyan colorwash) being treated to 5400 centigray (cGy) total in three fractions. The various beam angles to target the lesion are shown.
B Bottom) The dosimetric coverage of the lesion. The 100% isodose line (5400 cGy) covers the tumor. There is a rapid dose fall-off to the 50% isodose line (2700 cGy).
