What is the clinical definition of "point A" in brachytherapy?

The clinical definition of "point A" in brachytherapy specifically refers to the point where the uterine artery crosses the ureter. This point is crucial in the context of treating cervical cancer using brachytherapy, as it is involved in assessing the distribution of radiation and its relationship with critical surrounding structures. Point A is strategically chosen as a target because it is thought to provide effective dosing to the tumor while protecting adjacent organs. Understanding this anatomical landmark helps medical dosimetrists in planning treatment and ensuring optimal dose distribution, which is essential for maximizing the effectiveness of radiotherapy while minimizing potential side effects for the patient.