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(A) The Electron-Return Effect. Dose was deposited at the lung/tissue interface (3600-centigray [cGy] line) and at the trachea/tissue interface (6600-cGy line). (B) The Electron Air-Stream Effect (White Arrow; 400-cGy Isodose Line). Dose was deposited to protruding anatomic structures from electrons swept away from the treatment field by the magnetic field.
