Brachytherapy means placing packed radioactive source near or on the surface of tumor via body cavity, or embedding fine needle in tumor to import radioactive source.

• 近距离放疗仪器是指将封装好的放射源经人体腔道放在肿瘤体附近或表面,或是将细针管插植于肿瘤体内导入射线源实施照射的放疗技术。