Brachytherapy is a form of radiation therapy where a radioactive source is placed directly inside or next to the area requiring treatment. This allows for a high dose of radiation to target the tumor while minimizing exposure to surrounding healthy tissues. Brachytherapy is commonly used for cancers such as prostate, cervical, breast, and skin cancers. There are three main types of brachytherapy:
- Interstitial Brachytherapy: Radioactive sources are placed directly into the tissue, such as in prostate cancer treatment.
- Intracavitary Brachytherapy: Radioactive sources are placed within a body cavity, such as the cervix or uterus.
- Radioembolization: Radioembolization, also known as selective internal radiation therapy (SIRT), is a minimally invasive procedure used primarily to treat liver cancer. It involves delivering radioactive particles directly into the blood vessels feeding a liver tumor.
Advantages of Brachytherapy:
- High precision and control over radiation dose distribution.
- Shorter treatment times compared to external beam radiation therapy.
- Reduced risk of damage to surrounding healthy tissues.
- Often done on an outpatient basis.
Procedure:
- Preparation: Imaging techniques like CT, MRI, or ultrasound may be used to plan the placement of radioactive sources.
- Placement: Under anesthesia or sedation, radioactive sources are placed using applicators or catheters.
- Radiation Delivery: The sources deliver radiation over a specified period. Depending on the type, they may be left in place permanently (low-dose rate) or removed after a short time (high-dose rate).
- Post-Treatment Care: Monitoring for side effects and follow-up imaging to assess the effectiveness of treatment.
Brachytherapy offers a targeted, effective approach to treating certain cancers, with the potential for fewer side effects compared to other radiation therapies.