With advances in technology and screening, the overdiagnosis and overtreatment of ductal carcinoma in situ (DCIS) have increased. Minimizing treatment toxicity and cost is a high priority area of research. Intraoperative Radiation Therapy (IORT)is a form of radiation where a single high dose of irradiation is applied to the tumor bed at the time of lumpectomy. Its use has not been previously studied in DCIS. Proposed advantages include decreased toxicity to adjacent tissue and organs, reduction in healthcare costs, and improved quality of life. The investigators hypothesize that IORT is a safe and patient-friendly alternative to whole breast irradiation.