Dosimetric Comparison of Doses in Both Positions (Prone and Decubitus) for Patient With Breast Cancer

Inclusion Criteria: * Patients with primary breast cancer and in whom conservative post- surgery radiation therapy for breast cancer is prescribed. * Patients aged over 18 years * Patients with indication for conservative surgery. * Resection should be in healthy margin. * Women of childbearing potential must satisfy a negative pregnancy test at the screening visit and use effective contraception as determined by the physician of the patient throughout the study. Exclusion Criteria: * Minor Patient * Patients whose tumor resection is incomplete * Patients with an indication of mastectomy * Patients with a history of radiation therapy of the chest * Pregnant women, lactating, or of childbearing age without effective contraception. * Patients who had more than 4 scanners in one year. ( Scanner cervical , thoracic, or abdominal * Patients with an incompatible condition with monitoring protocol (psychiatric disorder, uncontrolled disease). * Patient unable to respond to a questionnaire