Radiation Oncology

MedStar Georgetown Cancer Institute at MedStar Southern Maryland Hospital Center offers the most advanced radiation oncology services. Our radiation oncology center, led by clinical director Andrew Satinsky, MD, gives you access to a full range of treatment technologies as well as clinical trials through the Georgetown Lombardi Comprehensive Cancer Center — the only comprehensive cancer center designated by the National Cancer Institute (NCI) in the Washington, D.C., region. This partnership allows us to provide you with access to the latest breakthroughs in cancer care.

Call us at 301-877-4673 to learn more. 

Our Services

patient on table of the ZAP-X machine talking to Dr. Andrew Satinsky
ZAP-X brings new hope to those with brain tumors as it is often an alternative to invasive brain surgery.

Our team of radiation oncologists are experts in using the latest radiation therapy and radiosurgery treatments to treat your cancer. The MedStar Georgetown Cancer Institute at MedStar Southern Maryland Hospital Center houses some of the most advanced, precise treatments available, including ZAP-X Gyroscopic Radiosurgery™ and the Varian Halcyon™ treatment system.

Our ZAP-X Gyroscopic Radiosurgery™ machine utilizes the latest technology to perform non-invasive radiosurgery on brain tumors. MedStar Southern Maryland is one of only a few centers in the entire world, and was the first hospital on the East Coast, to offer this state-of-the-art technology. With the ZAP-X® machine, our radiation oncologists and neurosurgeons can use the most precise radiation technology to treat complex brain tumors. Learn more about ZAP-X and if is an option for you.

Our radiation oncology services also include the Varian Halcyon™ radiation therapy treatment system – a new kind of radiotherapy offering faster, more accurate treatment. This system utilizes rapid image-guided radiotherapy to produce the most precise, computer-generated images. Our cancer care experts use those images to design a treatment plan that targets tumors and minimizes exposure to surrounding organs and tissues.

Meet our Radiation Oncologists

Andrew Satinsky, MD, is the clinical director for the radiation oncology center and has more than 30 years of experience in the medical field. He completed a medical internship at George Washington University Hospital and radiation oncology residency at MedStar Georgetown University Hospital and received his medical degree from the University of Chicago Pritzker School of Medicine in 1989. Dr. Satinsky helped develop the program for image-guided radiation therapy for prostate cancer at MedStar Southern Maryland Hospital. Involved in all aspects of adult radiation oncology, Dr. Satinsky serves as co-chair and cancer liaison physician on the cancer committee at MedStar Southern Maryland Hospital Center.

Peter Ahn, MD, joined the medical staff of MedStar Georgetown University Hospital's Department of Radiation Medicine in 2017, after five years as a radiation oncologist and assistant professor with the University of Pennsylvania Health System. Dr. Ahn completed his internship at Hurley Medical Center and his residency at Montefiore Medical Center. He is fellowship-trained by the University of Texas MD Anderson Cancer Center. Dr. Ahn received his medical degree from the Albert Einstein College of Medicine. He is nationally recognized by Castle Connolly's annual publication, "America's Top Doctors." 

Brian Collins, MD, is medical director of the Department of Radiation Medicine at MedStar Georgetown University Hospital and an assistant professor at Georgetown University School of Medicine. Dr. Collins fulfilled his internship at St. Vincent's Hospital and Medical Center in New York City and completed his residency at MedStar Georgetown. He received his medical degree from SUNY-Stony Brook. Dr. Collins is also a recognized specialist in CyberKnife® radiotherapy technology.

Keith R. Unger, MD, is director of the Gastrointestinal Cancer Service for the Department of Radiation Medicine at MedStar Georgetown University Hospital, and director for the department's residency training program. He also serves as associate professor of Radiation Medicine at the Georgetown University School of Medicine. Dr. Unger completed his internship at MedStar Washington Hospital Center and residency at MedStar Georgetown University Hospital, including a year as chief resident for radiation oncology. He received both his undergraduate and medical degree from the University of Virginia. He is also credentialed in the CyberKnife® system.


Location Information

Cancer Care

MedStar Georgetown Cancer Institute at MedStar Southern Maryland Hospital Center
7501 Surratts Road
Clinton, Maryland 20735
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Phone: 301-877-4673