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Advances in Radiotherapy
& Nuclear Medicine 3D-PT-assisted CT-guided I RSI
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Figure 3. The flowchart of three-dimensional-printed template-assisted computed tomography-guided iodine-125 radioactive seed implantation for head
and neck cancer.
Abbreviations: 3D-PCT: 3D-printing co-planar template; 3D-PNCT: 3D-printing non-co-planar template; CT: Computed tomography.

region. Detailed information regarding patient positioning, and needle trajectories to minimize potential damage to
anesthesia methods, and template types for RSI in each surrounding critical structures while achieving optimal
region can be found in Table 2. dose distribution in the target area. 34

4. Discussion Precise positioning and distribution of seed needles
are critical due to the intricate anatomical structures in
Radiation dose at the tumor site can be increased by the head and neck. Relying solely on image guidance may
placing the radiation source near or within the tumor.
This technique can also cause a rapid decline in dosage in result in inaccuracies in the placement of the puncture
the surrounding area. Brachytherapy has been recognized needle or seeds, potentially harming surrounding tissues
as an effective treatment modality by the Head and Neck or organs. However, the use of 3D-PT significantly
Working Group of the European Brachytherapy Group and reduces the challenges associated with puncturing during
the ABS. 30,31 The use of I RSI offers significant advantages RSI. These templates can effectively compensate for the
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in the treatment of recurrent or metastatic malignant lack of experience among novice operators and enhance
tumors. 32,33 To ensure the accuracy and safety of I RSI, the consistency of the procedures. The implementation
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meticulous pre-operative planning is essential. Radiation of 3D-PT also ensures accurate dose determination.
oncologists carefully design and optimize entry points Compared to traditional puncture techniques, template

Volume 2 Issue 4 (2024) 6 doi: 10.36922/arnm.4212