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The field of radiology continues to make gains in knowledge and technology. Newer methods are being tested to find better treatments for cancer and other conditions treated with radiation.
Some newer radiation therapies are:
Radiation may improve the effects of chemotherapy. In turn, chemotherapy may improve the effects of radiation. Protocols are being develops to find the most effective use of chemotherapy and radiation.
This method uses external beam radiation therapy or other types of radiation during surgery to treat certain cancers. The benefit of this method is that less tissue is exposed to radiation. The target area can be directly viewed, and a more effective dose of radiation may be used. The use of intraoperative irradiation, along with surgery, external beam therapy, or chemotherapy, has been shown to improve the outcome of cancer treatment in some cases.
Stereotactic irradiation is the use of a single high dose of radiation. Radiation is sent into the diseased tissue with very narrow beams of radiation. The two main forms of stereotactic irradiation are linear acceleration and the gamma knife. This method cut the length of hospital stays and the costs for certain brain cancers and conditions.
Particle radiation therapy uses higher-energy radiation particles in cancer therapy. Types of radiation particles used in radiation therapy include neutrons, protons, ions, and antiprotons.Proton therapy is the most widely used type of particle therapy. Fast neutron therapy may be used in the treatment of certain inoperable or recurrent tumors. There are only a few centers in the U.S. that offer this treatment.Antiproton therapy is the newest type of particle radiation therapy under study. It has promise for use in radiosurgery techniques.Internal hadron therapy is another type of particle radiation therapy. One example of this type of therapy is boron neutron-capture therapy. A boron compound is given to the person by injection. The boron builds up in the tumor or cancerous tissue. A reaction occurs in the tumor when a beam of neutrons is sent into the tumor, destroying the cancerous cells. The advantage of this method is that it can be used to treat wide-spread cancer.
Before the development of computed tomography (CT), exact targeting of a lesion or tumor for radiation therapy was difficult. CT provided a 2-dimensional means of viewing the treatment area. However, a 3D view is needed to define all borders of the lesion or tumor for the most precise treatment planning.
Similar to 3D conformal radiation therapy, intensity-modulated radiation therapy, or IMRT, uses varying intensity within single radiation beams to minimize the amount of radiation to normal tissues around the area being treated.
Radioimmunotherapy uses antibodies "tagged" with a cancer-killing substance. These tagged antibodies recognize tumor cells and bind with them, thus bringing the cancer-killing drug directly to the tumor tissue. The tagged antibodies may be given directly into an artery, under the skin, or directly into a body cavity such as the uterus.One advantage of this method is that it may be used to treat cancer that has spread that is not visible by diagnostic means. This helps eliminate the spread of the disease.
Cyberknife is a non-invasive way to treat both cancerous and non-cancerous tumors, as well as other health problems. It sends targeted, high-dose radiation to tumors, reducing exposure to the nearby healthy tissue. The components include a robotic arm and a tracking system that is used to reach tumors or problems in difficult regions and from any direction.
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