Application of artifact removal technique in precision radiotherapy for head and neck tumors(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2025年第1期
- Page:
- 7-13
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application of artifact removal technique in precision radiotherapy for head and neck tumors
- Author(s):
- GUO Chang1; SHEN Zetian1; ZHAO Benxin1; ZHOU Han1; 2
- 1. Department of Radiation Oncology, the Fourth Affiliated Hospital of Nanjing Medical University, Nanjing 211500, China 2. School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, China
- Keywords:
- Keywords: head and neck tumor CT value irradiation dose auto-segmentation metal artifact metal artifact reducing
- PACS:
- R318；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2025.01.002
- Abstract:
- Abstract: Objective To explore the application effect of artifact removal technique of Discovery RT (GE Inc) in organ segmentation and radiotherapy planning. Methods Twelve patients with head and neck tumors carrying irremovable metal dentures, who received radiotherapy at the Fourth Affiliated Hospital of Nanjing Medical University from September 2021 to February 2024, were enrolled in the study. AccuContour was used to perform organs-at-risk (OAR) segmentations separately on CT image processed by metal artifact reducing algorithm and conventional CT image. Dice similarity coefficient (DSC), Hausdorff distance (HD) and the mean CT values of OAR with or without metal artifacts were compared. Both the processed CT images and original images were transferred to Monaco planning system. Dose calculation was conducted on the images with metal artifacts, and the calculated plans were mapped to the artifact-free images for analyzing the dosimetric differences of OAR. Results The HD of the throat, oral cavity and mandible were slightly higher. The mean CT values of the tissues in images before and after artifact removal were not statistically different except for the trachea (P<0.05), and the mean oral CT value at the artifact level differed significantly in two groups (P<0.05). The radiation dose of different tissues in the radiotherapy plan before and after artifact removal only showed statistical differences in the superior constrictor musde of pharynx. The percentages of irradiation dose differences for the tissues ranged from 0 to 6.45%, with the largest fluctuation in the left lens (-2.92%±3.95%) and the right lens (1.29%±3.35%). Conclusion Manual delineation is required for the tissues close to metal artifacts due to the remarkable effects on CT values and planned dose, but there is few differences in the other tissues.
Last Update: 2025-01-19