A metallic actively-tracked injection needle was constructed for purposes of reducing dose to normal tissues surrounding irradiated tumors in cervical cancer and prostate cancer radiation therapy. Hydrogel is injected into tissue or anatomic cavities between the tumor and normal tissues, increasing the distance from the radiation source. The needle was tested in a gynecological phantom and in swine. It provided 1.2x1.2x1.2mm3 targeting precision @16 frames-per-second navigation, supporting rapid navigation speeds currently possible only under X-ray or Ultrasound guidance. The injected topology over time was visualized during injection, allowing creation of more uniform dose-shielding regions.
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