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 (Dmean) 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 andDmean 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.
Xu Senkui,Yao Wenyan,Hu Jiang et al. Preliminary observation of new immobilization for total skin irradiation with helical tomotherapy[J]. Chinese Journal of Radiation Oncology, 2021, 30(11): 1183-1187.
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