More about Stereotactic Radiation TherapyFebruary 14, 2009 at 7:56 pm | Posted in Tentang Kanker | 1 Comment
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Stereotactic Radiation Therapy (SRT)
SRT is a type of external beam radiation therapy that can be completed in one to five days rather than several weeks. SRT is best for very small tumors. Doctors use very specialized imaging equipment to pinpoint exactly where the cancer cells are. Doctors monitor the area of the cancer and other organs on a screen while treatment is taking place.
A customized holder may be used to keep the area to be treated perfectly still during treatment. Combining the specialized imaging and the custom holder allows doctors to give a high dose of radiation to the tumor in a short amount of time.
- The advantage of SRT is it delivers the right amount of radiation to the cancer in a shorter amount of time than traditional treatments.
- A Disadvantage of SRT is that it may not be able to be used effectively if the area where the cancer is located is too close to a sensitive normal structure, such as the bowel. That means smaller doses of radiation must be given to be safe.
SRT is usually called stereotactic radiosurgery (SRS) when referring to treating tumors in or near the brain or spinal cord. SRS is most commonly used to treat these conditions:
- Cancers that spread to the brain (brain metastases).
- Cancers that start in the brain (gliomas and other brain tumors).
- Cancers that start on the surface of the brain, often near the base of the skull or ear canal (meningiomas or acoustic neuromas).
- Cancer that has already received radiation and surgery is nor an option.
- Very small tumors in the chest, abdomen or pelvis that cannot be removed surgically or treated with conventional radiation therapy.
SRT is usually called stereotactic body radiation therapy (SBRT) when referring to areas of the body other than the brain or spinal cord. SBRT is commonly used for these conditions:
- Small lung cancers.
- Cancers in the lung that started elsewhere (lung metastases).
- Liver cancers that started outside the liver (liver metastases).
This list covers commonly treated conditions but does not include every possibility. SRT may be useful for other cancers not readily addressed with surgery or conventional radiation therapy. Patients with tumors that are small and few in number are the best candidates for SRT; not all patients can benefit from this type of treatment. Your radiation oncologist can tell you whether SRT is an options for your specific condition as new research continues to broaden the use of this technology.