What is the reference point for dose prescription in intracavitary therapy?

In intracavitary therapy, particularly in the treatment of cervical cancer, the reference point for dose prescription is Point A. This concept is crucial in gynecological brachytherapy, where a radioactive source is placed within a body cavity to deliver targeted radiation to the tumor while minimizing exposure to surrounding healthy tissues.

Point A is defined as a specific location that is clinically relevant to the treatment area, typically located 2 cm superior to the external cervical os and 2 cm lateral to the endocervical canal. The dose prescribed to Point A is based on established guidelines and has been shown to correlate with effective treatment outcomes. It is essential for ensuring that sufficient radiation is delivered to the tumor while maintaining a standard reference for treatment consistency.

In summary, Point A serves as a key reference for dose prescription in intracavitary therapy, guiding clinical decisions to optimize therapeutic efficacy and safety.