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Congress: ECR24
Poster Number: C-14578
Type: EPOS Radiographer (educational)
DOI: 10.26044/ecr2024/C-14578
Authorblock: D. Im, H. C. Park; Gwangju/KR
Disclosures:
Deukchun Im: Nothing to disclose
Ho Chun Park: Nothing to disclose
Keywords: Ear / Nose / Throat, Head and neck, Oncology, Cone beam CT, CT, Radiation safety, Radiation therapy / Oncology, Radiotherapy techniques
Learning objectives  Nasal cavity and paranasal sinus cancers are relatively rare and account for about 5% of head and neck cancers. Diagnosis often occurs in the later stages for the majority of patients, given that symptoms and signs tend to be nonspecific or absent during the early phases. In cases of locally advanced nasal cavity and paranasal sinus cancer, the standard treatment involves surgery followed by postoperative radiotherapy or definitive radiotherapy with or without chemotherapy[1].In locally advanced stage, complete resection may not...
Read more Background Ten patients with Nasal Cavity Cancer who had undergone Intensity-Modulated Radiation Therapy (IMRT) were randomly selected. Each patient was immobilized using a thermoplastic mask to stabilize the head and neck. CT images with a slice thickness of 2.5mm were obtained from the skull to the clavicles.For target delineation, the Planning Target Volume (PTV) was defined following the identification of the Gross Tumor Volume (GTV) using preoperative PET-CT and CT scans, adhering to NCCN guidelines. PTVs were delineated to avoid overlap...
Read more Findings and procedure details  A comparative analysis was conducted on treatment plans for 10 patients using Novalis IMRT and Halcyon IMRT, VMAT techniques. In comparing the three plans, 95% target coverage in terms of prescribed dose was highest in Halcyon IMRT and lowest in Halcyon VMAT. Additionally, CI and HI values demonstrated superior outcomes in Halcyon IMRT. [fig 2] [fig 4] Regarding OAR comparison, the lens exhibited the lowest Dmax value in Halcyon IMRT, while optic nerve Dmax was lowest in Novalis IMRT. Halcyon IMRT plans also demonstrated...
Read more Conclusion  In this study, three plans were compared to minimize exposure to critical organs such as the eyes, lenses, optic nerves, optic chiasm, brain stem, and pituitary adjacent to the nasal cavity, while ensuring sufficient PTV (Planning Target Volume) dose coverage. The non-coplanar C-arm type Novalis requires direct couch rotation in-room, resulting in treatment and image-guided radiation therapy (IGRT) times of over twice that of Halcyon. On the other hand, the O-ring type Halcyon significantly reduces treatment time with fast internal...
Read more References Jeong, Y., Lee, S. W., Kwak, J., et al. (2014). A dosimetric comparison of volumetric modulated arc therapy (VMAT) and non-coplanar intensity modulated radiotherapy (IMRT) for nasal cavity and paranasal sinus cancer. Radiation Oncology, 9, 193. https://doi.org/10.1186/1748-717X-9-193. Huang, D., Xia, P., Akazawa, P., Akazawa, C., Quivey, J. M., Verhey, L. J., Kaplan, M., Lee, N. (2003). Comparison of treatment plans using intensity-modulated radiotherapy and three-dimensional conformal radiotherapy for paranasal sinus carcinoma. International Journal of Radiation Oncology Biology Physics, 56(1), 158-168. https://doi.org/10.1016/S0360-3016(03)00080-4. Raturi,...
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