Abstract：Objective To compare the difference between breast bracket combined with polyurethane foam and single polyurethane foam in the accuracy of immobilization, providing a better immobilization for breast cancer radiotherapy. Methods Fifty breast cancer patients who received radiotherapy in Sun Yat‐sen University Cancer Center from March 2021 to July 2021 were selected. Among them, 25 patients were immobilized with polyurethane foam (foam group), and the other 25 patients were immobilized with polyurethane foam combined with breast bracket (combination group). All patients were scanned by CBCT once a week to obtain setup errors in the SI, LR and AP directions for t‐test. The formula MPTV=2.5Σ+0.7σ was used to calculate the margin of the planning target volume(MPTV). Results The setup errors in the foam group were SI (2.0±3.26) mm, LR (0.88±2.76) mm, AP (1.22±3.55) mm, Rtn ‐0.24°±0.85°, Pitch 0.16°±1.11°, Roll ‐0.32°±1.05°, and the MPTV were 6.75 mm, 8.46 mm and 8.73 mm, respectively. The setup errors in the combination group were SI (1.0±3.01) mm, LR (0.62±2.74) mm, AP (1.82±3.21) mm, Rtn 0.64°±0.59°, Pitch 0.71°±1.22°, Roll 0.29°±0.73°, and the MPTV were 6.35 mm, 7.47 mm, and 7.61 mm, respectively. After comparing the setup errors in the three‐dimensional directions between two groups, the t value of LR, SI, AP and Rtn, Pitch, Roll was -4.304, -2.681, 1.384, and -9.457, -3.683, -5.323, respectively. And the differences in the LR, SI, Rtn, Pitch and Roll directions were statistically significant (all P<0.05). Conclusions The immobilization effect of polyurethane foam combined with breast bracket is better and the MPTV is also smaller than those of polyurethane foam alone. Therefore, it is recommended to use polyurethane foam combined with breast bracket for immobilization in breast cancer radiotherapy.
Yao Wenyan,Liu Biaoshui,Fang Jianlan et al. Breast bracket combined with polyurethane foam improves the accuracy of immobilization in breast cancer radiotherapy[J]. Chinese Journal of Radiation Oncology, 2022, 31(10): 916-921.
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2022, Vol. 31 
