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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
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.

Table 2: Results of target coverage of clinical target volumes (PTV), maximum dose, homogeneity index (HI), and conformity index (CI) for each treatment plan.
Fig 4: A comprehensive DVH evaluation of PTV: comparing Novalis IMRT and Halcyon IMRT, VMAT.
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 superior protection for the brain stem and optic chiasm.
Fig 5: A comprehensive DVH evaluation of the eye, lens, and optic nerve: Comparing Novalis IMRT and Halcyon IMRT, VMAT.
Fig 6: A comprehensive DVH evaluation of the brain stem, optic chiasm, pituitary : Comparing Novalis IMRT and Halcyon IMRT, VMAT.

The gamma evaluation pass rate of the Delta4 phantom, utilized as a quality assurance tool for the three plans, demonstrated satisfactory values well within the predefined criteria.
GALLERY