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Radiation Therapy

What is Radiation Therapy

Radiation therapy, or radiotherapy, uses ionizing radiation produced by a linear accelerator (linac) to destroy cancer cells and shrink tumors. The radiation passes through the body and delivers dose to the affected area while minimizing dose to the skin and tissue it passes through.

Although the radiation affects both cancer and normal cells, it has a greater effect on the cancer cells, damaging their genetic material and making impossible for these cells to continue to grow and divide. Treatment aimed at a cure will give the highest possible dose of radiation to the cancer area (within safe limits) to attempt to destroy all the cancer cells. Sometimes smaller doses are used, where the aim is to reduce the size of a tumor and/or relieve symptoms.

Most patients undergo radiation therapy once a day, five days per week, over a period lasting up to nine weeks. The total time, beginning with your first and ending with your last session, is called a course of treatment. Some patients are prescribed hypofractionated radiation therapy, which delivers higher doses of radiation in a more targeted fashion over fewer treatments.

Radiation therapy is used to both cure disease and alleviate the symptoms of cancer. There are also a number of non-malignant conditions that are treated using radiation therapy.

What happens during Radiation Therapy

Here are the steps our team will take you through at Flagler Radiation Oncology Center:

  1. Consultation
    1. The radiation oncologist may ask for diagnostic procedures to be undertaken, either at Flagler Imaging Center or a similar facility. These can include x-rays, computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET) scans, biopsies and blood tests. Once the nature of the disease has been established, a treatment regime will be planned and prescribed.
  2. Imaging
    1. MRI, CT or PET scanning, or ultrasound is required to determine the exact size, shape and position of the area to be treated within the body, known as the treatment site. These images are then used to plan the patients’ treatment. You are positioned exactly as you will be for your treatments, which may involve the use of immobilization devices to help you keep still. Marks are made on your skin to indicate the treatment area. Once you are positioned, images are acquired to help your treatment team plan as precise a treatment as possible while reducing the impact on organs and critical structures.
  3. Treatment Planning
    1. Once your images have been taken your physician prescribes the appropriate total dose of radiation and over how many days your treatment is to be administered, considering the tumor target and critical structures in the treatment area. Your physicist and dosimetrist work closely with your radiation oncologist and use sophisticated software to calculate the position, dose and frequency of the series of radiation beams that are to be your treatment. Before treatment commences the treatment may be simulated – i.e., performed in the treatment room, without radiation, to ensure the correct treatment will be delivered later.
  4. Delivery (treatment)
    1. Treatment may be given on an out-patient or in-patient basis, dependent on the patient’s health status. It is imperative that the prescription and treatment plan is adhered to as any missed treatment may affect success. The patient usually receives the same treatment each day for a course of treatment, which can last up to nine weeks. Treatment is monitored regularly and may be adjusted if the patient suffers from adverse side effects or loses weight.
    2. To receive the radiation therapy, you will lie on a couch under the machine, and be asked to remain still during the actual treatment. Once all is ready, your radiation therapist leaves the room to monitor your treatment. The gantry of the linear accelerator begins to rotate around you, as you breathe normally. You may see and hear this movement, but the treatment is completely painless. Radiation cannot be seen or felt while it is being given.
    3. During treatment a process of verification takes place. By using built-in imaging on Versa HD, images are taken of the treatment site. These images are used to verify both the patient position and the accuracy of the treatment beam.
  5. Follow-up
    1. Once your course of treatment is completed, you attend follow-up clinics for up to five years, to monitor your disease and manage any post-treatment side effects. Initially you will come to our center. Annual follow-ups may then be conducted by the specialist who sent you to for treatment.
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