What is brachytherapy?
Brachytherapy is radiation treatment delivered directly into your body. It is placed
as close to the cancer as possible. The radiation is delivered using radioactive isotopes
(chemical elements). The isotopes are inside delivery devices such as wires, seeds,
or rods. These devices are called implants.
Brachytherapy lets your doctor use a higher total dose of radiation over a shorter
time than is possible with external beam therapy. The radiation dose is focused on
the cancer cells and does less damage to the nearby normal cells.
Brachytherapy may be done along with external beam therapy to help destroy tumor cells
for certain types of cancer.
Brachytherapy is often used in the treatment of the following cancers:
Head and neck cancers
However, the therapy may also used to treat many other cancers.
How does brachytherapy work?
Brachytherapy can be delivered in 3 ways:
Intracavitary treatment. Radioactive implants are placed inside body cavities such as the vagina, uterus, or
Interstitial treatment. Radioactive implants are placed directly into the tumor and may stay in permanently.
Unsealed internal radiation therapy. A medicine with radioactive materials is injected into a vein or into a body cavity.
Brachytherapy implant placement may be either permanent or temporary:
Permanent brachytherapy. This is also called low-dose rate brachytherapy. Permanent brachytherapy uses implants
called pellets or seeds. These implants are very small, about the size of a grain
of rice. Your doctor inserts the seeds directly into a tumor with thin, hollow needles.
The seeds are left in place after the radiation has been used up. Their small size
causes little or no discomfort.
Temporary brachytherapy. In temporary brachytherapy, implants are removed after the treatment has ended. Implants,
such as hollow needles, catheters (hollow tubes), or balloons filled with fluid, are
inserted into or near the cancer for a period of time, then removed. Either high-dose
or low-dose brachytherapy may be used.
Your doctor may use anesthesia during the insertion of implants. This will depend
on the size and number of implants, as well as the location of the insertion site.
Generally, when you have brachytherapy, you will be treated on an outpatient basis.
If you have high dose therapy, you will be in the hospital for a few days. To protect
others from the effects of the radiation while it is active inside your body, you
will need to follow specific rules. Although each facility may have specific rules
for brachytherapy, generally, treatment may require the following:
Placing brachytherapy patients in a private room
Limiting hospital staff time in the patient's room, but all necessary care will be
Placing portable shields between the patient and staff or visitors
Limitations for visitors, which may include:
Pregnant women or children under a certain age should not visit
A limit on the length of visits
A limit on how close to get to the patient
How long does the radiation last?
How long the radiation lasts will depend on the type of treatment given. Your doctor
will determine the brachytherapy type based on the type of cancer you have, the location
of the cancer, and other considerations. If the brachytherapy implant is a low-dose
implant, the implant may be left in for several days. High-dose implants may be removed
after only a few minutes.
Some implants are permanent. If you have a permanent implant, you may need to stay
in the hospital for a few days. The radiation gets weaker each day, and you will most
likely be discharged after a few days. There may be certain safety measures to be
taken at home. The doctor will give you specific instructions if needed.
Your doctor may remove temporary implants after you have the complete dose of radiation.