Preliminary observation of new immobilization for total skin irradiation with helical tomotherapy
10.3760/cma.j.cn113030-20200810-00413
- VernacularTitle:基于螺旋断层治疗的全身皮肤照射体位固定新技术初步观察
- Author:
Senkui XU
1
;
Wenyan YAO
;
Jiang HU
;
Yunfei XIA
;
Dehua KANG
;
Yalan TAO
;
Xiaobo JIANG
;
Jie LU
;
Chengguang LIN
Author Information
1. 华南国家肿瘤实验室 中山大学肿瘤防治中心，广州 510060
- Keywords:
Helical tomotherapy;
Total skin irradiation;
Immobilization
- From:
Chinese Journal of Radiation Oncology
2021;30(11):1183-1187
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To preliminarily observe the feasibility of different immobilization techniques for total skin irradiation (TSI) using helical tomotherapy.Methods:Three eczema scrophuloderma patients treated with TSI in Sun Yat-sen University Cancer Center were immobilized with low-temperature thermoplastic in a prone position, diving suit combined with negative pressure vacuum bag in a supine position, low-temperature thermoplastic combined with vacuum bag in a supine position, respectively. Different immobilization effects were observed. The conformity index (CI) of the target area, heterogeneity index (HI) of the target area, and the mean dose (D mean) of the target area were calculated. Results:Three immobilization methods could achieve satisfactory immobilization effects, and all the dosimetric parameters of radiation treatment plans met the clinical requirements. The average set-up errors in the left and right, head and foot, and abdomen and back directions of three patients were (0.26±3.40) mm, (-2.63±4.63) mm and (6.13±4.86) mm, respectively. The CI, HI andD mean were0.56±0.09, 1.186±0.059 and (2586.56±63.28) cGy. Conclusions:Low-temperature thermoplastic or diving suits can be combined with vacuum bags for immobilization in TSI. The epidermal dose can be increased with bolus through the dose-building effect, which can provide a safe and reliable method for TSI in helical tomotherapy.
