What does the dose rate at "point B" indicate in treatment planning?

The dose rate at "point B" is crucial for understanding the distribution of radiation during treatment planning. Specifically, it indicates the dose delivered to a location close to critical structures, such as the bladder, that need to be protected from excessive radiation exposure. In this context, point B is often referenced in treatments involving pelvic regions, where avoiding high doses to nearby organs is a priority to minimize complications.

This measurement allows medical dosimetrists to optimize treatment plans by ensuring that the dose to the target volume is maximized while limiting the dose to adjacent sensitive structures. The identification of point B serves as a benchmark to help achieve the therapeutic goal while safeguarding against potential damage to the bladder.