Stereotactic Body Radiation Therapy
Extracranial Stereotactic Radiation Therapy, also known as Stereotactic Body Radiotherapy (SBRT), is a non-invasive method of delivering highly-focused radiation to a target within the body. This technology is being used in our practice to treat numerous conditions throughout the body that were previously unapproachable with conventional radiation or surgery. SBRT represents an excellent alternative to surgery for many patients who cannot undergo surgery or who prefer not to have surgery. This technology is one of the major advances in the field of surgery and oncology allowing our doctors to cure many diseases during a few, non-invasive treatments in our department. The most common diseases treated with SBRT include:
ROA has by far the longest and most extensive experience with SBRT in Northern Virginia. There are several commercially available devices that can perform SBRT, including Novalis®, CyberKnife®, Trilogy®, and TomoTherapy®. All of these devices can perform x-ray imaging to confirm targeting prior to SBRT treatment, this technique is known as image-guided radiation therapy (IGRT). However, only Trilogy® and TomoTherapy® can also perform computed tomography (CT) scans allowing doctors to use more accurate imaging to guide treatment and avoiding the need for surgically implanted marker seeds that can be seen with x-rays, as are needed with CyberKnife®. Based on these advantages ROA, together with Inova Fairfax Hospital, acquired both Trilogy® and TomoTherapy® for use in SBRT.
One additional obstacle in treating tumors within the body is respiratory motion. To deliver an accurate, focused treatment this must be accounted for in the treatment planning and delivery. ROA uses the most advanced equipment available to map the respiratory cycle during the target definition process. Once respiratory motion is taken into account, Trilogy® can perform respiratory-gating using a sophisticated system that controls the radiation beam in conjunction with the respiratory cycle. This allows ROA doctors to treat lung, liver, and pancreatic lesions with the greatest accuracy possible.
Typical SBRT Procedure
Step 1. Consultation
Step 2. Imaging Acquisition for Target Definition
Step 3. Image Fusion
Step 4. Treatment Planning
Step 5. The Treatment