uses radiation to kill cancer cells and shrink tumors. Some normal cells will be damaged with radiation. The goal of radiation therapy is to kill as many cancer cells as possible, while limiting damage to healthy cells.
Intensity modulated radiation therapy (IMRT) is a treatment of cancer. It uses radiation beams of different intensities. The beams deliver appropriate doses of radiation to the tumor and reduce the dose to nearby healthy tissue.
Radiation therapy works to destroy or shrink the tumor to eliminate or prevent the spread of cancer. It can also be used to relieve symptoms caused by the tumor (eg, pain, bleeding).
Compared with conventional radiation therapy, IMRT can safely deliver greater doses of radiation. The higher dose may also improve the success of the treatment.
IMRT is generally associated with fewer side effects than conventional radiation therapy. Side effects vary from person to person, depending on the location of your cancer. Some people experience no side effects at all. General side effects of radiation therapy may include:
Loss of appetite
Specific side effects associated with the area of the body being treated
Although uncomfortable, the side effects associated with radiation therapy are usually not serious. They can be controlled with medicine and diet. Your radiation oncologist can explain the side effects you are likely to experience and help determine the best strategies of managing them.
What to Expect
Prior to Procedure
Planning for IMRT is complex and generally takes 2-5 days. Planning may include:
Coming in one or more times for imaging tests to identify exactly where the radiation beams will be focused; imaging tests used may include:
X-ray—a test that uses radiation to take a picture of structures inside the body
CT scan—a type of x-ray that uses a computer to make pictures of structures inside the body
MRI scan—a test that uses magnetic waves to make pictures of structures inside the body
PET scan—a test that uses a special camera to view structures inside the body after a radioactive solution is injected into a vein
CT/PET scan—a simultaneous fusion of both studies that provides increased accuracy over either study alone
Marking the locations on the skin where the radiation will be focused to guide the therapist
Being fitted for a localization device (eg, mask, body frame), which can help target accuracy
Using ultrasound or implanted markers to track the position of the tumor
Description of the Procedure
Using the marks made on your skin as a guide, the radiation therapist will position you on the treatment table. Films or ultrasound may be used to check the accuracy of the treatment setup. Then the therapist leaves the room to control the movements of the radiation machine. The treatment delivers radiation in a three-dimensional manner. This will help to conform as closely as possible to the shape of the tumor. The healthy tissue receives smaller doses of radiation than the tumor.
You will be asked to remain still during the radiation treatment. You may breathe normally. In general, you will not feel or sense anything during treatment. However, the machine can be stopped if you feel sick or uncomfortable. The therapists will be monitoring you on a TV camera. You will be able to communicate to them should you need to.
Immediately After Procedure
You will be able to leave and resume your normal daily activities. Receiving IMRT does not make you radioactive, and you do not need to avoid being around other people because of the treatment.
How Long Will It Take?
Each session will take 15-30 minutes. Patients are typically scheduled for IMRT five days per week for 4-8 weeks.
How Much Will It Hurt?
Holding one position may become a little uncomfortable, but it is not painful.
During treatment, your doctor will want to see you at least once a week. You may have blood tests or other studies performed.
After your treatment is completed, you will come in for regular visits to monitor for side effects and healing and check for signs of recurrent disease. You may require further testing, medicine, or rehabilitative treatment. Be sure to follow your doctor’s
Call Your Doctor
After arriving home, contact your doctor if any of the following occurs:
Please be aware that this information is provided to supplement the care
provided by your physician. It is neither intended nor implied to be a
substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER
IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the
advice of your physician or other qualified health provider prior to
starting any new treatment or with any questions you may have regarding a