| Luo Dashuang,Li Zhibin,Zhang Xiangyu,He Haiping,Li Guangjun,Bai Sen.Feasibility study of optical surface imaging assisted postmastectomy radiotherapy set-up[J].Chinese Journal of Radiological Medicine and Protection,2022,42(11):871-876 |
| Feasibility study of optical surface imaging assisted postmastectomy radiotherapy set-up |
| Received:June 13, 2022 |
| DOI：10.3760/cma.j.cn112271-20220613-00252 |
| KeyWords:Optical surface imaging Breast cancer Set-up errors Bolus |
| FundProject:四川省科技计划项目(2021YFS0143) |
| Author Name | Affiliation | E-mail | | Luo Dashuang | Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China | | | Li Zhibin | Department of Radiotherapy Oncology, First Affiliated Hospital of Soochow University, Suzhou 215006, China | | | Zhang Xiangyu | Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China | | | He Haiping | Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China | | | Li Guangjun | Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China | gjnick829@sina.com | | Bai Sen | Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China | |
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| Abstract:: |
| Objective To investigate the performance of optical surface imaging (OSI) in the postmastectomy radiotherapy setup and to assess the effects of 3D printed silicone bolus on OSI detection precision.Methods A retrospective analysis was conducted for 16 patients treated with left-sided postmastectomy radiotherapy (PMRT) in West China Hopital, Sichuan University from January to April, 2021. The setup errors of 16 patients without bolus detected using OSI (OSIno-bolus, OSIn) were obtained before error correction was conducted using cone-beam CT (CBCT). The correlation between OSIn and CBCT was analyzed, and then the diagnostic efficacy of OSI was assessed using the receiver operating characteristic (ROC) curves. The setup errors of six patients with 3D printed silicone bolus detected using OSI (OSIbolus, OSIb) were obtained through off-line image registration, and then the detection precision of OSIn and OSIb in the translational directions was compared.Results The setup errors in the case of OSIn were highly correlated with CBCT in the translational direction (r ≥ 0.80), but were weakly correlated in the rotation direction (r < 0.40). In the ROC analysis, the area under the curve (AUC) in the y direction was the lowest and was in the order of AUC5 mm ≥AUC3 mm > 0.75 for any translational direction. The difference in the detection precision between OSIn and OSIb was not statistically significant in the x and z directions (P ＞ 0.05), but was statistically significant in the y direction (Z = -2.56, P = 0.01). In the y direction, the systematic error of detection precision in the case of OSIb was 3.11 mm higher than that in the case of OSIn, and the random error of detection precision in the case of OSIb was 1.9 mm higher than that in the case of OSIn.Conclusions OSI cannot yet substitute CBCT in the postmastectomy radiotherapy setup, but its detection error is still within the clinically acceptable range. The performance of OSI-assisted setup is expected to be further improved by mitigating the interference of factors such as bolus in the imaging path through operational training. |
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