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Isodose plans prescribed to 3850 cGy for 2 left-sided patients. (A) Double scattering isodose plan for patient #13 (first enrolled on the phase 2 trial; mean heart dose 1.2 cGy). (B) Pencil-beam scanning isodose plan for patient #41 (last enrolled on the phase 2 trial; mean heart dose 19.1 cGy). Note the greater ability to optimize (reduce) surface and subcutaneous dose with the pencil-beam scanning delivery technique.
