Statement: Patients with a COPD diagnosis through spirometry are ineligible for the primary trial.
Primary_evidence: Inclusion Criteria:   Requiring adjuvant or post mastectomy radiation therapy with tangential fields or 3-fields   Adequate pulmonary function   Presence of 5 cc of the heart or liver with the simulation fields   Karnofsky Performance Status (KPS) equal to or greater than 70 Exclusion Criteria:   Pregnant women   Patients who have had previous ipsilateral breast or thoracic radiation therapy