The afterloading source is a non-open intracavitary brachytherapy. Depending on the applicator, it is mainly used for vaginal, cervix, anorectal and other parts of the vagina, as well as the treatment of interstitial lesions. It is suitable for surgical rejection of special parts. , Patients whose external radiation cannot be controlled or whose therapeutic dose cannot be achieved.
The brachytherapy source is widely used because of its high local dose, small damage to healthy tissues, and good tolerance that cannot be achieved by external radiation. With the development of three-dimensional imaging technology, planning systems and treatment equipment, brachytherapy is also more widely used in more types of cancer treatments.