Brachytherapy interstitial implants can be categorized as what?

The correct categorization of brachytherapy interstitial implants as temporary or permanent stems from the nature of their application and release of radiation. In brachytherapy, interstitial implants involve placing radioactive sources directly into or adjacent to the tumor. This method allows for a high dose of radiation to be delivered precisely to the tumor while sparing surrounding healthy tissues.

Temporary implants are often used in settings where a high dose rate (HDR) is desired for a limited duration. These sources are typically inserted for a short period, allowing for controlled and intense radiation exposure before removal.

Permanent implants, on the other hand, involve the insertion of radioactive seeds that remain in the body and provide a lower dose of radiation over an extended period. These seeds slowly decay and gradually release radiation, allowing them to treat the tumor over days or even months.

Because both types of brachytherapy interstitial implants are utilized based on the clinical scenario, treatment objectives, and tumor characteristics, their categorization as both temporary and permanent is appropriate. This versatility enables dosimetrists and oncologists to tailor treatments to the individual patient's needs.