Comparison of registration of cervical vertebra in the first radiotherapy using two different fixation methods for neck tumor(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2019年第6期
- Page:
- 632-635
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Comparison of registration of cervical vertebra in the first radiotherapy using two different fixation methods for neck tumor
- Author(s):
- LU Zihong1; DU Yi 1; YANG Jingxian1; LI Junyu1; YU Songmao1; LI Tingting2; WU Hao1
- 1. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital & Institute, Beijing 100142, China; 2. 302 Military Hospital of PLA, Beijing 100039, China
- Keywords:
- ; Keywords: neck tumor; fixation method; cervical vertebra; radiotherapy
- PACS:
- R739.91；R815.2
- DOI:
- DOI:10.3969/j.issn.1005-202X.2019.06.003
- Abstract:
- Abstract: Objective To compare the registration of cervical vertebra in the first radiotherapy using two different fixation methods for neck tumors, so as to select a more optimal fixation method, improve the accuracy of positioning and treatment, and shorten the treatment time. Methods Thirsty patients with neck tumors were randomly divided into group A (n=15) and group B (n=15). The patients in two groups were treated with different fixation methods. The distance between the posterior edge of 7 cervical vertebrae and the base of the head and occipital was measured in the CBCT images of the first radiotherapy and the localization CT images, and the distance difference between CBCT images and CT images was compared. Finally, the registration differences between two groups were compared and analyzed. Results The registration differences in group A were as follows: C1=(-0.188 00±0.367 06), C2=(-0.169 33±0.402 64), C3=(-0.226 67±0.417 52), C4=(-0.234 00±0.455 55), C5=(-0.209 33±0.434 17), C6=(-0.174 67±0.431 56), C7=(-0.166 67±0.360 92) cm. The registration differences in group B were as follows: C1=(0.112 00±0.199 61), C2=(0.044 00±0.157 92), C3=(0.038 67±0.218 86), C4=(0.086 70±0.190 30), C5=(-0.020 67±0.218 65), C6=(0.129 33±0.463 33), C7=(0.084 00±0.261 28) cm. All the registration differences in the two groups were less than 0.3 cm, within the range of clinical requirements, but the registration differences in group B were significantly lower than those in group A. Conclusion Compared with the fixation method in group A, the fixation method in group B can improve the registration of cervical vertebra and protect the spinal cord and other organs-at-risk, thereby further improving the accuracy of target irradiation, ensuring the irradiation dose of target areas, and reducing the irradiation dose of normal tissues.
Last Update: 2019-06-25