Application of artifact removal technique in precision radiotherapy for head and neck tumors
10.3969/j.issn.1005-202X.2025.01.002
- VernacularTitle:去伪影技术在头颈部肿瘤精准放疗中应用研究
- Author:
Chang GUO
1
;
Zetian SHEN
;
Benxin ZHAO
;
Han ZHOU
Author Information
1. 南京医科大学第四附属医院放疗科,江苏南京211500
- Publication Type:Journal Article
- Keywords:
head and neck tumor;
CT value;
irradiation dose;
auto-segmentation;
metal artifact;
metal artifact reducing
- From:
Chinese Journal of Medical Physics
2025;42(1):7-13
- CountryChina
- Language:Chinese
-
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.
