Elekta Infinity Radiation Therapy in Portland

Improving radiotherapy accuracy with shorter sessions

Radiation therapy, or radiotherapy, uses ionizing radiation produced by a linear accelerator (linac) to kill 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 cure will give the highest possible dose of radiation to the cancer area (within safe limits) to attempt to kill all the cancer cells. Sometimes smaller doses are used, where the aim is to reduce the size of a tumor and/or relieve symptoms.

Electrons are used to treat skin cancers and other superficial lesions, as they are absorbed by the first few centimeters of skin, leaving very little dose to pass into the body. Radiation therapy is used to both cure disease and alleviate the symptoms of cancer. There are also a number of nonmalignant conditions that are treated using radiation therapy.

Why we use Elekta Infinity

Adventist Health Portland is committed to providing the highest quality cancer care. With Elekta Infinity, we have the world's most advanced radiation therapy system for cancer treatments. Elekta Infinity reduces the time required for radiotherapy sessions to five minutes or less, while giving your doctor the ability to treat targets more aggressively than ever before.

Elekta Infinity incorporates volumetric modulated arc therapy (VMAT), an innovative way to deliver radiation treatments that is a significant improvement over current approaches. With Elekta's VMAT technology, the target area is continuously irradiated while the source of the beam rotates around the patient.

Faster, more precise treatments

Clinicians using Elekta Infinity can create a dose that conforms very tightly to the target area in significantly less time than with current techniques. Elekta VMAT achieves this with sophisticated computer programming that simultaneously controls five different system components: gantry position, gantry speed, leaves of the multi-leaf collimator, collimator angle and dose rate.

The state-of-the art Elekta Infinity integrates a suite of imaging tools to enable high quality, 3D imaging at the time of treatment. In addition to improving accuracy, Elekta Infinity reduces or eliminates the need for implanting markers, as clinicians can visualize soft tissue detail using Elekta Infinity.

Safer treatments

To minimize unnecessary exposure to radiation, Elekta Infinity incorporates ultra-low dose capabilities through active leakage reduction to ensure minimal dose to critical structures. Elekta Infinity also incorporates real-time assurance that the intended dose is delivered as precisely as it was planned.

Additionally, the low-dose imaging capability of Elekta Infinity helps minimize the side effects of radiation therapy by reducing the margins previously set to account for uncertainties of target dimensions, location and movement. In addition, clinicians have the confidence that a 3D plan will be delivered as an accurately targeted 3D treatment.

What happens during radiation therapy

Here are the steps you'll go through at Adventist Health:

Visit to hospital consultant: The radiation oncologist may ask for diagnostic procedures to be undertaken, either in the radiation therapy department or at a general hospital. 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.

Imaging: MRI, CT or PET scanning 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 your treatment.

Treatment Planning: Once your images have been taken, your physician develops a treatment plan. The treatment plan is created using treatment planning software, which calculates the position, dose and frequency of the treatment. Before treatment commences the treatment may be simulated i.e., performed on a non-treating machine, to ensure the correct treatment will be delivered later.

Treatment: Treatment may be given on an outpatient or inpatient basis. You will usually receive the same treatment each day for a course of treatment, which can last up to six weeks. Treatment is monitored regularly for adverse side effects or weight loss. During treatment you lie still on a couch under the machine. The treatment is completely painless.

Verification: During treatment, a process of verification takes place. By using built-in imaging on Elekta Infinity, images are taken of the treatment site. These images are used to verify both the patient position and the accuracy of the treatment beam.

Follow-up: When the treatment is completed, the patient attends follow-up clinics for up to five years. These are held to assist the patient in managing any post-treatment side effects and to monitor the disease regression or progression. Initially the patient attends the center where he or she was treated. Annual follow-ups may then be conducted at a hospital closer to the patient.