Intensity modulated radiation therapy (IMRT) is the most advanced form of 3-D conformal radiation therapy, a technique that adjusts the radiation beam to the contours of a tumor, 考虑到更高, more effective doses of radiation to be delivered while minimizing exposure to surrounding healthy tissue.
Intensity Modulated Radiation Therapy
This technique, developed in the late 1980s, uses computer tomography (CT) 和 magnetic resonance imaging (MRI) to create 3D images of the affected organ 和 surrounding tissues. Based on these images, treatment is carefully designed for each patient with selected radiation beam directions, aperture shapes 和 intensities.
This precision allows high doses of radiation to be delivered to the tumor while minimizing the radiation 和 potential damage to healthy tissue.
加州大学旧金山分校, which has one of the best-equipped Radiation Oncology departments in the country, began offering IMRT in 1997 for adults. We offer two types of the treatment:
- Multileaf collimator (MLC) IMRT. MLC-IMRT uses as many as 25 fixed beams to deliver radiation to its target.
- 串行tomotherapy. This treatment uses a specially designed IMRT that rotates around the patient. The therapy involves several rotations to deliver radiation beams from the most effective angle, 考虑到更高 doses to the tumor, while sparing nearby healthy tissue.
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IMRT may be used in the treatment of cancers 和 tumors including:
过程
IMRT typically is administered five days a week for five to eight weeks. For each session, the patient is in the treatment room for 15 to 30 minutes. Small amounts of radiation given on a daily basis, rather than a few large doses, help to reduce damage to body tissues surrounding the tumor.
Weekend rest breaks allow normal cells to recover.
The total dose of radiation 和 number of treatments a patient receives depend on the size, location 和 type of the tumor, the patient's general health 和 other factors.
The first IMRT session tends to be longer than others so that additional X-ray films 和 checks can be taken.
Before treatment begins, colored semi-permanent ink may be used to mark the patient's skin to indicate the alignment of the radiation equipment with the targeted area. In the treatment room, the radiation therapist uses the marks to locate the treatment area.
The patient is positioned on a treatment table. Sometimes, special molded devices are used to help with positioning.
The radiation therapist leaves the treatment room before the machine, controlled from a nearby area, 被激活. The patient can be seen on a television screen or through a window in the control room 和 the therapist can talk with the patient through an intercom.
IMRT是无痛的, non-invasive therapy, during which patients don't hear, see or feel the radiation. If the patient does become uncomfortable during the procedure, the machine can be stopped at any time.
加州大学旧金山分校健康 medical specialists have reviewed this information. It is for educational purposes only 和 is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.
