Radiation Oncology/Therapy

VCS Treatments

How Does Radiation Therapy Work?

Radiation therapy works by causing DNA damage in cancer cells that cannot be repaired and leads to cancer cell death. It can be given externally or internally, depending on the type and location of the tumor. External radiation is delivered by a machine called a linear accelerator that generates high-energy beams that are precisely directed into the tumor. External beam radiotherapy is delivered over several days or many weeks depending on a variety of factors. Internal radiation therapy, also known as brachytherapy, uses radioactive sources that can be temporarily inserted or permanently implanted in the operating room. Radiation from the implant travels only a short distance, which spares most tissues from treatment side effects.

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                            [post_content] => Harold C. Agbahiwe, M.D. received his undergraduate education at Princeton University and earned his medical degree from Duke University School of Medicine.  After an internship and residency at Thomas Jefferson University Hospital, Dr. Agbahiwe went on to complete a residency in radiation oncology at Johns Hopkins Hospital. During his time there, his research was presented at both national and international conferences, and he was the recipient of several awards, including the RSNA Roentgen Resident/Fellow Research Award, a Young Investigator Award from the Johns Hopkins Department of Radiation Oncology, and a HDR Brachytherapy Fellowship from the American Brachytherapy Society. He is board certified in radiation oncology and internal medicine.

Dr. Agbahiwe joins Virginia Cancer Specialists after serving on faculty at the Johns Hopkins Department of Radiation Oncology at Sibley Memorial Hospital in Washington, DC. He holds memberships in multiple medical organizations, including the American Society for Radiation Oncology and the American Society of Clinical Oncology. He has also authored several peer-reviewed publications and book chapters. He is experienced in the treatment of all types of cancers using the most up-to-date radiation treatment techniques.

Dr. Agbahiwe is dedicated to providing his patients with the highest quality of care. In his spare time, he enjoys travel, music, and film. He is proficient in French.


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                            [post_content] => Dr. Gregory S. Sibley joined Virginia Cancer Specialists after 14 years in Radiation Oncology at Sibley Memorial Hospital in Washington, D.C.  Throughout his career, Dr. Sibley has focused on providing the highest quality care in the field of radiation oncology. He has positioned himself as an expert in the multi-disciplinary treatment of cancer and in state-of-the-art radiation treatment planning techniques. Within the US Oncology Network, Dr. Sibley is a member of the Executive Committee for Radiation Oncology and Vice-Chair for the Technology Committee. Dr. Sibley has authored over 20 peer-reviewed publications, many while on faculty at Duke University Medical Center. Although well-versed in the treatment of multiple cancers, Dr. Sibley has special interest in breast cancer, brachytherapy for prostate cancer, and intensity-modulated radiotherapy for head and neck, and lung cancers.

In his spare time, Dr. Sibley is an avid hockey player and triathlete.

 


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Our Radiation Oncologists

Advanced Treatment Options

Intensity Modulated Radiotherapy (IMRT)

IMRT is a noninvasive therapy that begins by acquiring a Computed Tomography (CT) scan exactly in the treatment position and then fusing other imaging studies like PET and MRI. The physician uses all of this information to precisely define the tumor as well as tissues to be avoided. Physicists/dosimetrists then use a sophisticated treatment planning system to maximize target coverage and minimize normal tissues exposure. The high speed computer does this by “trying” millions of beam segments and intensities until the best solution is determined. The result of IMRT planning is a dose that “shrink wraps” around the target. Although not beneficial for all patients, IMRT for some patients will both improve tumor control and reduce side effects. IMRT is routinely used to treat prostate, brain, and esophageal cancers, among others. A treatment course of IMRT typically spans 5-7 weeks.

 

Image-Guided Radiation Therapy (IGRT)

IGRT uses a combination of scanning technologies with the control of IMRT that delivers precise amounts of radiation. Continual scans ensure that cancer cells are being treated, while simultaneously avoiding normal structures and organs. IGRT can enable higher doses of radiation to be delivered more accurately and safely, which can increase the chance for tumor control and cure. This radiation oncology option is used to treat tumors close to organs or prone to body movements such as the lungs, liver, and prostate.

 

High Dose Rate (HDR) Brachytherapy

High Dose Rate (HDR) Brachytherapy is a direct delivery of precise radiation through the use of catheters, or applicators inserted into tissue or a body cavity. HDR briefly places a high activity radioactive source in contact with cancer tissues and is then removed when a curative dose has been delivered to the cancer. This comprehensive, aggressive approach to treatment ensures the maximum radiation dose is given where needed, while sparing the healthy surrounding tissue. HDR is frequently used in breast, cervical, and uterine cancers and has become an effective treatment for early stage prostate cancer. Treatments are typically given in 1-4 weekly doses, with each HDR treatment typically lasting for 3-5 minutes.

Radiation Therapies are targeted treatment options Radiation Oncology is the branch of cancer treatment that uses advanced radiotherapy delivery methods to target and treat a wide range of malignancies. At Virginia Cancer Specialists (VCS), our physicians use advanced treatment planning systems and state-of-the- art radiation technology to deliver treatment that is safer, faster, and more precise than ever before. Our highly trained staff works diligently to make your total experience as convenient and comfortable as possible.

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