Fig. 1
From: Current radiotherapy for recurrent head and neck cancer in the modern era: a state-of-the-art review
The CT-guided 125I seed implantation procedure and dose-volume histograms of gross tumor volume. Figure a showed the preoperative treatment plan including the planned needle locations, seed distribution, target volume doses, and organs at risk in a case of sinus osteosarcoma. The green needles and yellow seeds were the simulated needles and seeds in the brachytherapy treatment planning system. Figure b showed the actual locations of the needles before the implanting of seeds during operation. Figure c showed the actual distribution of seeds and the doses in target volume and organs at risk after seed implantation. Figure d showed the 3D-printed non-coplanar template model with guide holes on it in brachytherapy treatment planning system. Figure e showed the 3D-printed non-coplanar template model used in the implantation. Figure f showed the scene of seed implantation. Figure g–i showed the dose-volume histograms of gross tumor volume preoperation, intraoperation, and postoperation. The D90 before, in, and after 125I seed implantation were 138.6 Gy, 135.4 Gy, 137.4 Gy, respectively